You searched for +publisher:"Clemson University" +contributor:("Li , Gang").
Showing records 1 – 30 of
55 total matches.
◁ [1] [2] ▶
Clemson University
1.
Jiang, Xikai.
Nonequilibrium transport of ionic liquids in electrified nanosystems.
Degree: PhD, Mechanical Engineering, 2014, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/1438 
► Room-temperature ionic liquids (RTILs) are a promising class of electrolyte that are composed entirely of ions but are liquid at room temperature. Their remarkable…
(more)
▼ Room-temperature ionic liquids (RTILs) are a promising class of electrolyte that are composed entirely of ions but are liquid at room temperature. Their remarkable properties such as wide electrochemical window make them ideal electrolytes in many electrochemical systems. Because the non-equilibrium transport of RTILs often determines the performance of these systems, a fundamental understanding of such transport is needed. Here, using molecular dynamic (MD) and continuum simulations, we investigated the non-equilibrium transport of RTILs in three scenarios relevant to the application of RTILs in electrochemical systems: the electroosmotic flow (EOF) of RTILs through nanochannels, the electrokinetic transport of RTILs through nanopores, and the charging kinetics of the double layers near planar electrodes. For EOFs of RTILs through nanochannels, we discovered that their strength greatly exceeds that predicted by the classical hydrodynamic theories. We traced the unexpected flow strength to the short-wavelength nature of the EOFs in RTILs, which requires the generalized hydrodynamics (i.e., nonlocal law for the shear stress-strain rate relation) for describing such flows. The EOF in RTILs is thus a rare example in which short-wavelength hydrodynamics profoundly affects flow measurables. For the electrokinetic transport of RTILs through nanopores, we discovered that, in pores wetted by RTILs a gradual dewetting transition occurs upon increasing the applied voltage, which is accompanied by a sharp increase in ionic current. These phenomena originate from the solvent-free nature of RTILs and are in stark contrast with the transport of conventional electrolytes through nanopores. Amplification of these phenomena is possible by controlling the properties of the pore and RTILs, and we showed that it is especially pronounced in charged nanopores. For the charging kinetics of the double layers near planar electrodes, we found that, the potential across the double layers can oscillate during charging when the charging current is large. Such oscillation originates from the sequential growth of the ionic space charge layers near the electrode surface. This allows the evolution of double layers in RTILs with time, an atomistic process difficult to visualize experimentally, to be studied by analyzing the cell potential under constant current charging conditions.
Advisors/Committee Members: Miller, Richard, Qiao, Rui, Li, Gang, Wang, Pingshan.
Subjects/Keywords: Nanoscience and Nanotechnology
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Jiang, X. (2014). Nonequilibrium transport of ionic liquids in electrified nanosystems. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/1438
Chicago Manual of Style (16th Edition):
Jiang, Xikai. “Nonequilibrium transport of ionic liquids in electrified nanosystems.” 2014. Doctoral Dissertation, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_dissertations/1438.
MLA Handbook (7th Edition):
Jiang, Xikai. “Nonequilibrium transport of ionic liquids in electrified nanosystems.” 2014. Web. 24 Jan 2021.
Vancouver:
Jiang X. Nonequilibrium transport of ionic liquids in electrified nanosystems. [Internet] [Doctoral dissertation]. Clemson University; 2014. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_dissertations/1438.
Council of Science Editors:
Jiang X. Nonequilibrium transport of ionic liquids in electrified nanosystems. [Doctoral Dissertation]. Clemson University; 2014. Available from: https://tigerprints.clemson.edu/all_dissertations/1438
Clemson University
2.
Dangeti, Venkata Sampath.
IDENTIFYING TARGET PROPERTIES FOR THE DESIGN OF META-MATERIAL TANK TRACK PADS.
Degree: MS, Mechanical Engineering, 2014, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/1886
► On track vehicle systems, track pads are designed to provide traction and support the weight of the vehicle, they have limited service life due…
(more)
▼ On track vehicle systems, track pads are designed to provide traction and support the weight of the vehicle, they have limited service life due to common failure by blowout. According to the literature, blowout is a failure mode caused by overheating due to hysteresis in elastomeric materials during high speed operations. Elastomers are used primarily for their high compliance, which is essential to protect the suspension components and maintain structural integrity of the track pad. The objective of the work is to explore the use of linear elastic meta-materials with optimized topology to replace elastomers and reduce or eliminate the effect of hysteretic loss. This work presents a methodology to design an alternate meta-material that can provide some of the desired elastic properties of the track pads. To determine the requirements for linear elastic meta-materials, dynamic analyses of a rollover event were conducted. From these analyses the complex dependence of the strain history on different strain components is understood. Due to the non-linearity of elastomers, tangent stiffness matrices are required to update the stress states at different strain increments. The elasticity tensors (tangent operators) determined at a set of strain levels, are used as prescribed constitutive parameters to tailor the meta-material unit-cell topology. The optimal material properties according to which the elastomeric track pad is designed with linear elastic material are identified in this work.
Advisors/Committee Members: Fadel, Georges M, Li , Gang, Coutris , Nicole, Castanier , Matthew.
Subjects/Keywords: Elastomers; Hyperelastic; Meta-materials; Ogden; Optimization; Topology; Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Dangeti, V. S. (2014). IDENTIFYING TARGET PROPERTIES FOR THE DESIGN OF META-MATERIAL TANK TRACK PADS. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1886
Chicago Manual of Style (16th Edition):
Dangeti, Venkata Sampath. “IDENTIFYING TARGET PROPERTIES FOR THE DESIGN OF META-MATERIAL TANK TRACK PADS.” 2014. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/1886.
MLA Handbook (7th Edition):
Dangeti, Venkata Sampath. “IDENTIFYING TARGET PROPERTIES FOR THE DESIGN OF META-MATERIAL TANK TRACK PADS.” 2014. Web. 24 Jan 2021.
Vancouver:
Dangeti VS. IDENTIFYING TARGET PROPERTIES FOR THE DESIGN OF META-MATERIAL TANK TRACK PADS. [Internet] [Masters thesis]. Clemson University; 2014. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/1886.
Council of Science Editors:
Dangeti VS. IDENTIFYING TARGET PROPERTIES FOR THE DESIGN OF META-MATERIAL TANK TRACK PADS. [Masters Thesis]. Clemson University; 2014. Available from: https://tigerprints.clemson.edu/all_theses/1886
Clemson University
3.
Iyer, Vaibhav.
ACOUSTIC SCATTERING AND RADIATION RESPONSE OF CIRCULAR HEXAGONAL AND AUXETIC HONEYCOMB SHELL STRUCTURES.
Degree: MS, Mechanical Engineering, 2014, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/1912
► Sandwich panels with honeycomb cores are used in many engineering applications because of their high strength to weight ratio, vibration isolation and sound transmission…
(more)
▼ Sandwich panels with honeycomb cores are used in many engineering applications because of their high strength to weight ratio, vibration isolation and sound transmission loss characteristics. Previous studies indicate that such sandwich structures with auxetic honeycomb cores (negative in-plane Poisson's ratio) can have a higher sound transmission loss compared to a regular hexagonal honeycomb core structure. In this study, sound scattering and acoustic radiation characteristics of sandwich structures with hexagonal and auxetic cores arranged in a circular pattern interacting with exterior acoustic domains of both air and water have been investigated using finite element analysis. A novel in-plane honeycomb geometry is developed which provides for a gradual decrease in radial cell size and whole number of circumferential cells to generate a uniform distribution of cells in the circular shell. Adding more circumferential cells, enables outer honeycomb edges to approach a circular arc and provides a comparison between the circular honeycomb and a solid elastic cylinder shell with the same mass. Natural frequencies of the different shell structures in-vacuo have been extracted in the analysis range of 0-2000 Hz. It is observed that auxetic honeycomb has lower natural frequencies compared to regular honeycomb for the same mass indicating that the auxetic is more flexible. The acoustic scattering and radiation performance in terms of target strength (TS) defined as the magnitude of reflected/scattered wave pressure relative to the magnitude of the incident plane wave pressure is measured both on the scattering surface and far-field at both the back and front scattering point were studied in both air and water. In the case of interaction with air in the exterior acoustic region, the radiation response shows prominent resonance peaks at the in-vacuo natural frequencies of the elastic structures as expected. Results show that there are significant differences in target strength between the auxetic and regular honeycomb and elastic solid circular shell structures studied, with relative TS performance between the different shells depending on the frequency of the incident wave and the acoustic domain used.
Advisors/Committee Members: Thompson, Lonny L, Li , Gang, Summers , Joshua.
Subjects/Keywords: Cylindrical shell; Radiation; Scattering; Audio Arts and Acoustics; Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Iyer, V. (2014). ACOUSTIC SCATTERING AND RADIATION RESPONSE OF CIRCULAR HEXAGONAL AND AUXETIC HONEYCOMB SHELL STRUCTURES. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1912
Chicago Manual of Style (16th Edition):
Iyer, Vaibhav. “ACOUSTIC SCATTERING AND RADIATION RESPONSE OF CIRCULAR HEXAGONAL AND AUXETIC HONEYCOMB SHELL STRUCTURES.” 2014. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/1912.
MLA Handbook (7th Edition):
Iyer, Vaibhav. “ACOUSTIC SCATTERING AND RADIATION RESPONSE OF CIRCULAR HEXAGONAL AND AUXETIC HONEYCOMB SHELL STRUCTURES.” 2014. Web. 24 Jan 2021.
Vancouver:
Iyer V. ACOUSTIC SCATTERING AND RADIATION RESPONSE OF CIRCULAR HEXAGONAL AND AUXETIC HONEYCOMB SHELL STRUCTURES. [Internet] [Masters thesis]. Clemson University; 2014. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/1912.
Council of Science Editors:
Iyer V. ACOUSTIC SCATTERING AND RADIATION RESPONSE OF CIRCULAR HEXAGONAL AND AUXETIC HONEYCOMB SHELL STRUCTURES. [Masters Thesis]. Clemson University; 2014. Available from: https://tigerprints.clemson.edu/all_theses/1912
Clemson University
4.
Bavuluri, Seetha ram.
Set up time Reduction and Quality Improvement on the Shop floor using different lean and quality tools.
Degree: MS, Mechanical Engineering, 2012, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/1306
► The purpose of this thesis document is to describe a method developed for reducing setup time in machining processes and simultaneously improve the quality…
(more)
▼ The purpose of this thesis document is to describe a method developed for reducing setup time in machining processes and simultaneously improve the quality of production after setup. Bosch Rexroth at Fountain Inn is a semi-automated plant and is still in its initial stages of standardizing the setup process. Setup time at different machining centers includes: machining time, inspection time, loading and unloading times and deburring. The focus of the described method is in reducing setup times related to inspection time and loading and unloading times. To achieve success in these problems the following new tools were developed: first piece inspection charts, design inspection fixture and design of new handling tools. This work involved interaction with operators, collection of data, and analyzing and developing new plans based on the analysis. Tools like Failure Modes Effects Analysis (FMEA), 5S and Single-Minute Exchange of Die (SMED) techniques helped in making and implementing these changes on the production line. Implementation of first piece inspection charts and inspection reduced inspection time by almost 50%. Design of handling tools helped in reducing stress on the operator and also in reducing loading and unloading time by 40%. Also quality was improved through a related project. This subproject's aim is to reduce shaft alignment problems as reported by the customer. To achieve this goal I designed a fully automatic shaft alignment tool, which helps operator in installing the shaft into the pump without any difficulty. This shaft alignment tool is installed on the line and eliminated the shaft alignment problems completely. Also the quality improvement techniques and set up time reduction techniques used at BOSCH are discussed in this document
Advisors/Committee Members: Mears, Laine M, Mocko , Gregory M, Li , Gang.
Subjects/Keywords: Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Bavuluri, S. r. (2012). Set up time Reduction and Quality Improvement on the Shop floor using different lean and quality tools. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1306
Chicago Manual of Style (16th Edition):
Bavuluri, Seetha ram. “Set up time Reduction and Quality Improvement on the Shop floor using different lean and quality tools.” 2012. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/1306.
MLA Handbook (7th Edition):
Bavuluri, Seetha ram. “Set up time Reduction and Quality Improvement on the Shop floor using different lean and quality tools.” 2012. Web. 24 Jan 2021.
Vancouver:
Bavuluri Sr. Set up time Reduction and Quality Improvement on the Shop floor using different lean and quality tools. [Internet] [Masters thesis]. Clemson University; 2012. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/1306.
Council of Science Editors:
Bavuluri Sr. Set up time Reduction and Quality Improvement on the Shop floor using different lean and quality tools. [Masters Thesis]. Clemson University; 2012. Available from: https://tigerprints.clemson.edu/all_theses/1306
Clemson University
5.
Gao, Zhe.
Component Mode Synthesis Approach for Quantum Mechanical Electrostatic and Transport Analysis of Nanoscale Structures and Devices.
Degree: MS, Mechanical Engineering, 2012, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/1417
► As the dimensions of commonly used semiconductor devices have shrunk into nanometer regime, it is recognized that the influence of quantum effects on their…
(more)
▼ As the dimensions of commonly used semiconductor devices have shrunk into nanometer regime, it is recognized that the influence of quantum effects on their electrostatic and transport properties cannot be ignored. In the past few decades, various computational models and approaches have been developed to analyze these properties in nanostructures and devices. Among these computational models, the SchrÅ¡dinger-Poisson model has been widely adopted for quantum mechanical electrostatic and transport analysis of nanostructures and devices such as quantum wires, metal-oxide-semiconductor field effect transistors (MOSFETs) and nanoelectromechanical systems (NEMS). The numerical results allow for evaluations of the electrical properties such as charge concentration and potential profile in these structures. The emergence of MOSFETs with multiple gates, such as Trigates, FinFETs and Pi-gates, offers a superior electrostatic control of devices by the gates, which can be therefore used to reduce the short channel effects within those devices. Full 2-D electrostatic and transport analysis enables a better understanding of the scalability of devices, geometric effects on the potential and charge distribution, and transport characteristics of the transistors. The SchrÅ¡dinger-Poisson model is attractive due to its simplicity and straightforward implementation by using standard numerical methods. However, as it is required to solve a generalized eigenvalue problem generated from the discretization of the SchrÅ¡dinger equation, the computational cost of the analysis increases quickly when the system's degrees of freedom (DOFs) increase. For this reason, techniques that enable an efficient solution of discretized SchrÅ¡dinger equation in multidimensional domains are desirable. In this work, we seek to accelerate the numerical solution of the SchrÅ¡dinger equation by using a component mode synthesis (CMS) approach. In the CMS approach, a nanostructure is divided into a set of substructures or components and the eigenvalues (energy levels) and eigenvectors (wave functions) are computed first for all the substructures. The computed wave functions are then combined with constraint or attachment modes to construct a transformation matrix. By using the transformation matrix, a reduced-order system of the SchrÅ¡dinger equation is obtained for the entire nanostructure. The global energy levels and wave functions can be obtained with the reduced-order system. Through an iteration procedure between the SchrÅ¡dinger and Poisson equations, a self-consistent solution for charge concentration and potential profile can be obtained. In this work, the CMS approach is applied to compute the electrostatic and transport properties of a set of semiconductor devices including a quantum wire and several multiple-gate MOSFETs. It is demonstrated that the CMS approach greatly reduces the computational cost while giving accurate results.
Advisors/Committee Members: Li, Gang, Xuan, Xiangchun, Zhao, Huijuan.
Subjects/Keywords: Boundary; CMS; Poisson; Quantum; Schrodinger; Transmitting; Nanoscience and Nanotechnology
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Gao, Z. (2012). Component Mode Synthesis Approach for Quantum Mechanical Electrostatic and Transport Analysis of Nanoscale Structures and Devices. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1417
Chicago Manual of Style (16th Edition):
Gao, Zhe. “Component Mode Synthesis Approach for Quantum Mechanical Electrostatic and Transport Analysis of Nanoscale Structures and Devices.” 2012. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/1417.
MLA Handbook (7th Edition):
Gao, Zhe. “Component Mode Synthesis Approach for Quantum Mechanical Electrostatic and Transport Analysis of Nanoscale Structures and Devices.” 2012. Web. 24 Jan 2021.
Vancouver:
Gao Z. Component Mode Synthesis Approach for Quantum Mechanical Electrostatic and Transport Analysis of Nanoscale Structures and Devices. [Internet] [Masters thesis]. Clemson University; 2012. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/1417.
Council of Science Editors:
Gao Z. Component Mode Synthesis Approach for Quantum Mechanical Electrostatic and Transport Analysis of Nanoscale Structures and Devices. [Masters Thesis]. Clemson University; 2012. Available from: https://tigerprints.clemson.edu/all_theses/1417
Clemson University
6.
Gong, Xiao.
VIBRATION AND ACOUSTIC PERFORMANCE OF IN-PLANE HONEYCOMB SANDWICH PANELS.
Degree: MS, Mechanical Engineering, 2012, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/1483
► Sandwich panel structures constructed with cellular honeycomb cores allow for control of acoustic performance due to their ability to optimize effective orthotropic material properties…
(more)
▼ Sandwich panel structures constructed with cellular honeycomb cores allow for control of acoustic performance due to their ability to optimize effective orthotropic material properties with changes in cell geometry. By modification of topology and geometric parameters of a unit cell, desirable effective properties can be obtained and used to design lightweight structures with reduced vibration and increased sound transmission loss properties. Thus investigating the relation between the geometric configuration of the honeycomb core and vibration and acoustic behavior is important to optimize design of sandwich panels. In this work, a finite element model is developed in MATLAB to evaluate the resonance frequencies, vibration frequency response and structural behavior of general honeycomb sandwich panels undergoing in-plane loading. Bernoulli-Euler beam element stiffness and mass matrices are computed with coordinate transformations to assemble for two-dimensional frame dynamic analysis. The developed MATLAB finite element program is written to allow the user to specify any unit cell geometry together with the number of repeated cells along the longitudinal and transverse direction of a honeycomb sandwich panel. This automation allows for rapid studies of the effects of the cell geometry and number of cells for optimization and parametric studies. In addition, the user can specify the size of elements for cell length subdivision to ensure mesh convergence analysis. The developed MATLAB code was verified by comparing dynamic results to finite element models created using the commercial software ABAQUS using both cubic Bernoulli-Euler and quadratic Timoshenko beam elements. Natural vibration frequencies of the structure and vibration amplitude frequency response for honeycomb structures are computed between 1~1000 Hz, corresponding to low to medium frequency ranges. In addition, the ABAQUS finite element model is used to simulate the acoustic behavior of the sandwich panel mounted in a rigid baffle resulting from an incident plane pressure wave. This required the coupling of an acoustic finite element model tied to the sandwich panel model to model sound radiation from the vibrating panel. To model the infinite acoustic region on one side of the sandwich panel, the acoustic finite element mesh is truncated using a founded ellipse non-reflecting boundary condition (NRBC). Previous studies used a circular nonreflecting boundary condition. The use of an ellipse for the NRBC allows for a reduced size computational region surrounding the elongated sandwich panel structure. The accuracy of the NRBC's was also studied as a function of distance from the vibrating panel source. Various core configurations of different geometric and effective material properties for regular and auxetic honeycomb cell geometries with two different orthogonal orientations were studied. Constant mass property is applied for sandwich panels with different number of longitudinal and transverse cell numbers to identify the effects of…
Advisors/Committee Members: Thompson, Lonny L, Li , Gang, Daqaq , Mohammed.
Subjects/Keywords: Finite element; Honeycomb; sandwich panel; sound transmission loss; Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Gong, X. (2012). VIBRATION AND ACOUSTIC PERFORMANCE OF IN-PLANE HONEYCOMB SANDWICH PANELS. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1483
Chicago Manual of Style (16th Edition):
Gong, Xiao. “VIBRATION AND ACOUSTIC PERFORMANCE OF IN-PLANE HONEYCOMB SANDWICH PANELS.” 2012. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/1483.
MLA Handbook (7th Edition):
Gong, Xiao. “VIBRATION AND ACOUSTIC PERFORMANCE OF IN-PLANE HONEYCOMB SANDWICH PANELS.” 2012. Web. 24 Jan 2021.
Vancouver:
Gong X. VIBRATION AND ACOUSTIC PERFORMANCE OF IN-PLANE HONEYCOMB SANDWICH PANELS. [Internet] [Masters thesis]. Clemson University; 2012. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/1483.
Council of Science Editors:
Gong X. VIBRATION AND ACOUSTIC PERFORMANCE OF IN-PLANE HONEYCOMB SANDWICH PANELS. [Masters Thesis]. Clemson University; 2012. Available from: https://tigerprints.clemson.edu/all_theses/1483
Clemson University
7.
He, Lei.
Composite Sandwich Structures with Honeycomb Core subjected to Impact.
Degree: MS, Mechanical Engineering, 2012, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/1547
► Composite sandwich structures constructed with honeycomb core can be an effective means of absorbing impact in many engineer applications. Conventional hexagonal honeycomb exhibit an…
(more)
▼ Composite sandwich structures constructed with honeycomb core can be an effective means of absorbing impact in many engineer applications. Conventional hexagonal honeycomb exhibit an effective positive Poisson's ratio, are commonly employed due to their lightweight and high axial stiffness properties. In contrast, auxetic honeycombs offer high in-plane shear stiffness, and exhibit negative Poisson's ratios with lateral extension, instead of contraction, when stretched axially. In this study, the dynamic response of an aluminum composite panel with a honeycomb core constrained within two thin face sheets is investigated undergoing impact with a rigid ball. The finite element models used to simulate impact of the rigid ball with the honeycomb composite panel are solved using a nonlinear explicit dynamic analysis procedure including large deformation in ABAQUS, a commercial software package. This approach enables the cost-effective analysis, accurate estimation of the impact, and further understanding of the parameters that influence the complex response. The rebound velocity and kinetic energy time history of the rigid ball, together with the kinetic and strain energies, and displacement and velocity for the elastic structure during impact and after separation of the impacting bodies are presented to show the effect of different velocity magnitudes of the impacting ball and comparisons with regular and auxetic honeycomb cell geometries. Additionally, the effects of various impacting velocities and honeycomb geometries are compared for impact in two perpendicular in-plane directions, and from out-of-plane impact. Using the results of the incoming and rebound velocity of the ball, as well as the velocity of the point of contact on the structure at separation, and effective coefficient of restitution (COR) for the honeycomb sandwich structure is calculated and compared. Other measures include the ratio of incoming to outgoing fall velocities and ratio of incoming to outgoing kinetic energies. Results show that the increase of the impacting velocity increases both the kinetic energy and strain energy absorbed in the structure. Results also showed that for both in-plane and out-of-plane impacts, the regular honeycomb structure absorbed more energy compared to the auxetic structure. In addition, according to the results of the COR, impact with the auxetic model shows higher elastic rebound than the regular model.
Advisors/Committee Members: Thompson, Lonny, Li , Gang, Daqaq , Mohammed.
Subjects/Keywords: Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
He, L. (2012). Composite Sandwich Structures with Honeycomb Core subjected to Impact. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1547
Chicago Manual of Style (16th Edition):
He, Lei. “Composite Sandwich Structures with Honeycomb Core subjected to Impact.” 2012. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/1547.
MLA Handbook (7th Edition):
He, Lei. “Composite Sandwich Structures with Honeycomb Core subjected to Impact.” 2012. Web. 24 Jan 2021.
Vancouver:
He L. Composite Sandwich Structures with Honeycomb Core subjected to Impact. [Internet] [Masters thesis]. Clemson University; 2012. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/1547.
Council of Science Editors:
He L. Composite Sandwich Structures with Honeycomb Core subjected to Impact. [Masters Thesis]. Clemson University; 2012. Available from: https://tigerprints.clemson.edu/all_theses/1547
Clemson University
8.
Lewis, Timothy.
Development of a Two-dimensional Model of a Pneumatic Tire.
Degree: MS, Mechanical Engineering, 2012, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/1539
► The pneumatic tire has been studied extensively since its invention in 1888. With the advent of high-powered computers and the use of the finite…
(more)
▼ The pneumatic tire has been studied extensively since its invention in 1888. With the advent of high-powered computers and the use of the finite element method, the understanding of the tire's complex non-linear behavior has grown tremendously. However, one weakness of finite element models is that parameter studies are difficult and time consuming to perform. In contrast, an analytical model can quickly and easily perform extensive parameter studies. To the knowledge of the author, all existing analytical models of the tire make assumptions concerning the tire's behavior and construction that while useful for obtaining some of the first-order characteristics, are limited since they cannot relate tire behavior such as force-deflection to individual tire stiffnesses. As such, an adequate two-dimensional model of a pneumatic tire, including a finite element model, does not exist. Therefore, an analytical, two-dimensional model for a pneumatic tire in static contact with a rigid surface is developed and presented. The case of a non-pneumatic tire can be obtained as a special case. The quasi-static investigation concentrates on finding the relationships between the tire's size and stiffness and its deformation under loading. A total of seven stiffness parameters are accounted for. The belt of the tire is modeled using curved beam theory, developed by Gasmi, et al. (2011), which accounts for bending (EI), shearing (GA), and extensional (EA) deformations. The sidewall of the tire is modeled as a bi-linear spring (K
rT, K
rC) with pre-tensioning (F
P*) in the radial direction and a linear torsional spring (K
θ) in the circumferential direction. Application of virtual work leads to a set of 6th order differential equations for the displacements in the belt that must be solved in three distinct regions. The first region is the region where the radial deformation is greater than the radial deformation of the inflated and unloaded tire. The second region is the region where the radial deformation of the sidewall is less than the inflated position but not in contact with the ground, and the third region is defined to be the region in contact with the ground. The length of the contact patch is represented by the angle enclosed by the edges of contact, and analytical expressions of stress resultants and displacements at the centroids of cross-sections are expressed in terms of this angle. In order to improve the accuracy of the model for large deformations, a special inflation pressure was calculated that allowed the most accurate solution to the linear model to be obtained by minimizing the circumferential force in the region of the largest rotation of the curved beam. This solution was then modified to account for the true inflation pressure. This two-step solution procedure was validated with a geometrically nonlinear finite element model of a non-pneumatic tire. Force vs. deflection and force vs. counter deflection results were compared to experimental data for a…
Advisors/Committee Members: Joseph, Paul F, Rhyne , Timothy B, Li , Gang.
Subjects/Keywords: Analytical 2D Model; Pneumatic Tire; Tire Behavior; Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lewis, T. (2012). Development of a Two-dimensional Model of a Pneumatic Tire. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1539
Chicago Manual of Style (16th Edition):
Lewis, Timothy. “Development of a Two-dimensional Model of a Pneumatic Tire.” 2012. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/1539.
MLA Handbook (7th Edition):
Lewis, Timothy. “Development of a Two-dimensional Model of a Pneumatic Tire.” 2012. Web. 24 Jan 2021.
Vancouver:
Lewis T. Development of a Two-dimensional Model of a Pneumatic Tire. [Internet] [Masters thesis]. Clemson University; 2012. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/1539.
Council of Science Editors:
Lewis T. Development of a Two-dimensional Model of a Pneumatic Tire. [Masters Thesis]. Clemson University; 2012. Available from: https://tigerprints.clemson.edu/all_theses/1539
Clemson University
9.
Liu, Xiyuan.
An Electromagnetic Energy Harvester for Powering Consumer Electronics.
Degree: MS, Mechanical Engineering, 2012, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/1415
► This thesis introduces an electromagnetic vibratory energy harvester to power consumer electronics by generating electricity from the strides taken during walking or jogging. The…
(more)
▼ This thesis introduces an electromagnetic vibratory energy harvester to power consumer electronics by generating electricity from the strides taken during walking or jogging. The harvester consists of a magnetic pendulum oscillating between two fixed magnets. The pendulum behaves similar to a rotor in a DC generator, while the fixed magnets, which are poled opposite to the pendulum, provide magnetic restoring forces similar to mechanical springs. When attached to a person's arm, the swinging motion subjects the magnetic pendulum to base excitations. Consequently, the pendulum oscillates near a stator which has three poles of wound copper coils. The motion of the pendulum induces a time-varying magnetic field in the flux path which generates electricity in the coils as per Faraday's law. To better understand the response behavior of the device, the thesis presents a nonlinear electromechanical model that describes the interaction between the mechanical and electrical subsystems. Experimental system identification is then implemented to characterize several unknown design parameters, including the nonlinear magnetic restoring torque, the mechanical damping coefficient, and the electromechanical coupling. The derived nonlinear mathematical model, which mimics the behavior of a damped Duffing oscillator, is then solved analytically using the method of multiple scales and the results are compared to experimental data showing good agreement for the design parameters considered. The performance of the device in charging a small battery while jogging is investigated. The motion of a typical swinging arm in terms of frequency and acceleration is reproduced on an electrodynamic shaker and used to charge a 100 μAh battery yielding an estimated charging time of 12 minutes.
Advisors/Committee Members: Dadaq, Mohammed F, Vahidi , Ardalan, Li , Gang.
Subjects/Keywords: Battery Charging; Electromagnetic; Energy Harvesting; Nonlinear Dynamics; Vibration and Control; Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Liu, X. (2012). An Electromagnetic Energy Harvester for Powering Consumer Electronics. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1415
Chicago Manual of Style (16th Edition):
Liu, Xiyuan. “An Electromagnetic Energy Harvester for Powering Consumer Electronics.” 2012. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/1415.
MLA Handbook (7th Edition):
Liu, Xiyuan. “An Electromagnetic Energy Harvester for Powering Consumer Electronics.” 2012. Web. 24 Jan 2021.
Vancouver:
Liu X. An Electromagnetic Energy Harvester for Powering Consumer Electronics. [Internet] [Masters thesis]. Clemson University; 2012. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/1415.
Council of Science Editors:
Liu X. An Electromagnetic Energy Harvester for Powering Consumer Electronics. [Masters Thesis]. Clemson University; 2012. Available from: https://tigerprints.clemson.edu/all_theses/1415
Clemson University
10.
Subrahmanian, Ramaswami.
Applying Chaotic Advection to Rheology: an In Situ Structuring Rheometer.
Degree: PhD, Mechanical Engineering, 2012, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/791
► A prototype In Situ Structuring Rheometer (ISSR) was designed and implemented to study changes in shear viscosity of polymer blends and composites while processing them…
(more)
▼ A prototype In Situ Structuring Rheometer (ISSR) was designed and implemented to study changes in shear viscosity of polymer blends and composites while processing them in such a way as to control the evolution of microstructure. The ISSR is based on a regime of fluid mechanics known as chaotic advection, in which simple time-periodic flow fields can cause fluid particles to move chaotically. Chaotic advection is also the basis of Smart Blending, a technology employed to process polymer blends having a variety of morphologies at a fixed composition, and polymer composites in which the additives have been arranged into layered structures or networks. Smart Blending has been implemented as batch devices or continuous flow devices, with a device of the former type providing the basis for the ISSR. Designed as a test cell to be fitted into a commercial instrument so as to leverage its measurement capability, the core of the ISSR is a cylindrical blending cavity the end surfaces of which are formed by rotatable disks which induce stirring. While the upper disk is an attachment for the commercial instrument, the lower disk has an independent drive system. The ISSR also includes a heating chamber, temperature control systems and a purge gas system. Alternate counter-rotation of the disks through an appropriate displacement leads to a chaotic flow. The design of the ISSR and experiments conducted using it were guided by modeling. The result is that even as the microstructure in the sample is being controllably formed, the shear viscosity is measured each time the upper disk rotates. In contrast, conventional rheometry using a parallel-plate or cone-plate test cell involves mixing materials as melts beforehand, with a polymer blend usually having a droplet morphology and a composite usually having the additive randomly dispersed throughout the polymer matrix. Three types of systems were processed and studied using the ISSR. At least three samples of each system were processed to different extents, cryogenically fractured and examined using scanning electron microscopy (SEM). By so doing, the trends in viscosity were related to progressive structure development, which is the controlled evolution and retention of particular blend and composite morphologies, as has been documented in previous chaotic advection blending studies. The first system was a compatible blend of low density polyethylene (LDPE) and high density polyethylene (HDPE), for which the viscosity initially rose and eventually reached a plateau, which was consistent with a model that showed no change in viscosity with the number of layers. Blend samples at different stages of processing showed the initial formation of layers and the development of nanoscale features as these layers refined. The second system was a composite of linear low density polyethylene (LLDPE) and carbon black (CB), for which the shear viscosity slowly decreased with continued processing. Micrographs indicated that the carbon black initially…
Advisors/Committee Members: Zumbrunnen, David A, Grujicic , Mica, Li , Gang, Thompson , Lonny.
Subjects/Keywords: Blends; Chaotic advection; In Situ Structuring; Rheology; Rheometer; Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Subrahmanian, R. (2012). Applying Chaotic Advection to Rheology: an In Situ Structuring Rheometer. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/791
Chicago Manual of Style (16th Edition):
Subrahmanian, Ramaswami. “Applying Chaotic Advection to Rheology: an In Situ Structuring Rheometer.” 2012. Doctoral Dissertation, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_dissertations/791.
MLA Handbook (7th Edition):
Subrahmanian, Ramaswami. “Applying Chaotic Advection to Rheology: an In Situ Structuring Rheometer.” 2012. Web. 24 Jan 2021.
Vancouver:
Subrahmanian R. Applying Chaotic Advection to Rheology: an In Situ Structuring Rheometer. [Internet] [Doctoral dissertation]. Clemson University; 2012. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_dissertations/791.
Council of Science Editors:
Subrahmanian R. Applying Chaotic Advection to Rheology: an In Situ Structuring Rheometer. [Doctoral Dissertation]. Clemson University; 2012. Available from: https://tigerprints.clemson.edu/all_dissertations/791
Clemson University
11.
Qaroush, Yousef.
Implementation of Delayed-Feedback Controllers on Continuous Systems and Analysis of their Response under Primary Resonance Excitations.
Degree: PhD, Mechanical Engineering, 2011, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/686
► During the last three decades, a considerable amount of research has been directed toward understanding the influence of time delays on the stability and stabilization…
(more)
▼ During the last three decades, a considerable amount of research has been directed toward understanding the influence of time delays on the stability and stabilization of dynamical systems. From a control perspective, these delays can either have a compounding and destabilizing effect, or can actually improve controllers' performance. In the latter case, additional time delay is carefully and deliberately introduced into the feedback loop so as to augment inherent system delays and produce larger damping for smaller control efforts. While delayed-feedback algorithms have been successfully implemented on discrete dynamical systems with limited degrees of freedom, a critical issue appears in their implementation on systems consisting of a large number of degrees of freedom or on infinite-dimensional structures. The reason being that the presence of delay in the control loop renders the characteristic polynomial of the transcendental type which produces infinite number of eigenvalues for every discrete controller's gain and time delay. As a result, choosing a gain-delay combination that stabilizes the lower vibration modes can easily destabilize the higher modes. To address this problem, this dissertation introduces the concept of filter-augmented delayed-feedback control algorithms and applies it to mitigate vibrations of various structural systems both theoretically and experimentally. In specific, it explores the prospect of augmenting proper filters in the feedback loop to enhance the robustness of delayed-feedback controllers allowing them to simultaneously mitigate the response of different vibration modes using a single sensor and a single gain-delay actuator combination. The dissertation goes into delineating the influence of filter's dynamics (order and cut-off frequency) on the stability maps and damping contours clearly demonstrating the possibility of effectively reducing multi-modal oscillations of infinite-dimensional structures when proper filters are augmented in the feedback loop. Additionally, this research illustrates that filters may actually enhance the robustness of the controller to parameter's uncertainties at the expense of reducing the controller's effective damping. To assess the performance of the proposed control algorithm, the dissertation presents three experimental case studies; two of which are on structures whose dynamics can be discretized into a system of linearly-uncoupled ordinary differential equations (ODEs); and the third on a structure whose dynamics can only be reduced into a set of linearly-coupled ODEs. The first case study utilizes a filter-augmented delayed-position feedback algorithm for flexural vibration mitigation and external disturbances rejection on a macro-cantilever Euler-Bernoulli beam. The second deals with implementing a filter-augmented delayed-velocity feedback algorithm for vibration mitigation and external disturbances rejection on a micro-cantilever sensor. The third implements a filter-augmented…
Advisors/Committee Members: Daqaq, Mohammed M., Li , Gang, Schiff , Scott, Vahidi , Ardalan.
Subjects/Keywords: Multi-Mode Feedback; Nonlinear Dynamics; Smart Structures; Time-Delay Systems; Vibration Control; Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Qaroush, Y. (2011). Implementation of Delayed-Feedback Controllers on Continuous Systems and Analysis of their Response under Primary Resonance Excitations. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/686
Chicago Manual of Style (16th Edition):
Qaroush, Yousef. “Implementation of Delayed-Feedback Controllers on Continuous Systems and Analysis of their Response under Primary Resonance Excitations.” 2011. Doctoral Dissertation, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_dissertations/686.
MLA Handbook (7th Edition):
Qaroush, Yousef. “Implementation of Delayed-Feedback Controllers on Continuous Systems and Analysis of their Response under Primary Resonance Excitations.” 2011. Web. 24 Jan 2021.
Vancouver:
Qaroush Y. Implementation of Delayed-Feedback Controllers on Continuous Systems and Analysis of their Response under Primary Resonance Excitations. [Internet] [Doctoral dissertation]. Clemson University; 2011. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_dissertations/686.
Council of Science Editors:
Qaroush Y. Implementation of Delayed-Feedback Controllers on Continuous Systems and Analysis of their Response under Primary Resonance Excitations. [Doctoral Dissertation]. Clemson University; 2011. Available from: https://tigerprints.clemson.edu/all_dissertations/686
Clemson University
12.
Bell, William.
MULTI-LENGTH SCALE MODELING OF THE HIGH-PRESSURE, LARGE-STRAIN, HIGH-STRAIN-RATE RESPONSE OF SODA-LIME GLASS.
Degree: PhD, Mechanical Engineering, 2011, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/755
► Development of new transparent armor systems is essential for the protection of the current and future US armed forces, especially in light of the recent…
(more)
▼ Development of new transparent armor systems is essential for the protection of the current and future US armed forces, especially in light of the recent military operations The Operation Iraqi Freedom in Iraq and The Operation Enduring Freedom in Afghanistan. These conflicts have introduced a new military theater without a well-defined battle front and new types of threats (e.g. improvised explosive devices, IEDs). Development and modeling of new transparent armor systems for use in numerous applications from vehicle windows to face shields is a current area of thrust aimed at addressing the shortcomings of existing systems in order to better protect US soldiers and align with the military's goal of becoming more mobile, deployable, and sustainable. This dissertation is focused predominately on the computational modeling of transparent armor materials and structures. Glass remains the dominant constituent in many modern transparent armor systems for a number of performance and manufacturing related reasons and thus is the material of focus in the present work. The present work is concerned with the development and further enhancement of a continuum-level, physically-based, high strain-rate, large-strain, high-pressure mechanical material model for soda-lime (and borosilicate) glass. The model is being developed in attempt to capture the complex stochastic, pre-existing flaw-controlled damage nature of glass under blast and impact conditions and do so in a computationally efficient manner. Numerous finite element simulations were carried out using the computational code ABAQUS/Explicit to assess the utility of the model under physically realistic ballistic loading conditions, including multi-hit impact scenarios. Further enhancements of the glass material model are made with the inclusion of the following: (i) differentiation of the mechanical properties of the so-called air-side and tin-side of glass plates manufactured using the float glass process; and (ii) a damage tensor to produce an orthotropic macro-cracked material. In addition a multi-length scale modeling approach for glass is taken to elucidate phenomena at different length scales (e.g. glass irreversible densification, shock response, etc.) with the ultimate objective of enhancing the efficacy of the current continuum-level material model. The irreversible densification of glass under ballistic (shock) loading conditions is investigated at multiple length scales (atomistic-level and continuum-level) in order to understand its effect on the ballistic penetration resistance of glass. The findings related to the material shock response and irreversible densification of glass were subsequently included in the continuum-level glass material model equation of state to further increase its efficacy. The results from the various test scenarios and modifications to the continuum-level glass material models reveal that: (a) transient non-linear dynamics computational analyses, when utilizing the glass material model, have demonstrated to…
Advisors/Committee Members: Grujicic, Mica, Joseph , Paul F, Singh , Rajendra, Li , Gang.
Subjects/Keywords: Glass; Impact; Material Modeling; Shock; Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Bell, W. (2011). MULTI-LENGTH SCALE MODELING OF THE HIGH-PRESSURE, LARGE-STRAIN, HIGH-STRAIN-RATE RESPONSE OF SODA-LIME GLASS. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/755
Chicago Manual of Style (16th Edition):
Bell, William. “MULTI-LENGTH SCALE MODELING OF THE HIGH-PRESSURE, LARGE-STRAIN, HIGH-STRAIN-RATE RESPONSE OF SODA-LIME GLASS.” 2011. Doctoral Dissertation, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_dissertations/755.
MLA Handbook (7th Edition):
Bell, William. “MULTI-LENGTH SCALE MODELING OF THE HIGH-PRESSURE, LARGE-STRAIN, HIGH-STRAIN-RATE RESPONSE OF SODA-LIME GLASS.” 2011. Web. 24 Jan 2021.
Vancouver:
Bell W. MULTI-LENGTH SCALE MODELING OF THE HIGH-PRESSURE, LARGE-STRAIN, HIGH-STRAIN-RATE RESPONSE OF SODA-LIME GLASS. [Internet] [Doctoral dissertation]. Clemson University; 2011. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_dissertations/755.
Council of Science Editors:
Bell W. MULTI-LENGTH SCALE MODELING OF THE HIGH-PRESSURE, LARGE-STRAIN, HIGH-STRAIN-RATE RESPONSE OF SODA-LIME GLASS. [Doctoral Dissertation]. Clemson University; 2011. Available from: https://tigerprints.clemson.edu/all_dissertations/755
Clemson University
13.
Gandhi, Ninad.
FINITE ELEMENT ANALYSIS OF EFFECTIVE MECHANICAL PROPERTIES OF HIERARCHICAL HONEYCOMB STRUCTURES.
Degree: MS, Mechanical Engineering, 2015, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/2216
► Honeycomb structures are widely used in engineering applications mainly due to their high strength to weight ratio. By changing the base material and geometry of…
(more)
▼ Honeycomb structures are widely used in engineering applications mainly due to their high strength to weight ratio. By changing the base material and geometry of the repeating unit cell structure, target effective properties can be achieved. Hierarchical honeycomb structures are known to have enhanced mechanical properties when compared to regular honeycomb structures. Therefore, it is important to understand and quantify the mechanical properties and the variation of these properties with the presence of hierarchy. This investigation builds upon prior work and considers the mechanical properties of two dimensional hierarchical honeycomb structures. Previous research of hierarchical honeycomb structures studied replacing the homogeneous cell walls with truss lattices, or by replacing the cell walls by composite layers. Another hierarchy was examined by replacing the vertices of hexagon by smaller hexagons. However, in contrast to these previous studies, reiterated hierarchy is studied in this work, where a first order hierarchy structure is created by placing smaller honeycombs inside the conventional honeycombs such that midpoints of edges of the base level-0 honeycomb are shared vertices of the smaller level-1 honeycomb. In this work, the in-plane effective mechanical properties of these reiterated hierarchical honeycomb structures are studied with both regular and auxetic honeycombs. Effective elastic moduli and Poisson's ratio properties are determined and compared for a range of different cell wall thickness ratios between the base level-0 and smaller level-1 hierarchy. For comparisons, the mass was kept constant in all cases. Given the total mass and thickness ratio of the level-0 to level-1 hierarchy, the mass distribution is varied. The mechanical properties are determined from finite element analysis of a patch of honeycombs in both uni-axial tension and shear loading conditions. By changing the thickness ratio of level-0 to level-1 hierarchy, a nonlinear variation in mechanical properties is observed showing maximum and minimum values at specific ratios. From the results of first order regular hierarchical honeycomb structures, it can be said that for the same mass, the effective Young's modulus for thickness ratio of 0.1 between level-0 divided by level-1 is maximum and is about 1.45 times that of the zeroth order. Maximum effective shear modulus occurs for the special case with thickness ratio of zero, corresponding to a special level-1 honeycomb structure with the level-0 structure removed, and is 1.57 times that of the zeroth order. From the results of first order auxetic hierarchical honeycomb structures, it can be said that the effective relative Young's modulus, and shear modulus of first order is higher for any thickness ratio than that of the zeroth order auxetic honeycomb structure of the same mass. The maximum effective Young's modulus occurs for thickness ratio 9 and is about 2.8 times that of the zeroth order. The maximum effective shear modulus of first order structure…
Advisors/Committee Members: Thompson, Lonny L, Summers, Joshua D, Li, Gang.
Subjects/Keywords: Auxetic hierarchical honeycomb structures; Effective mechanical properties of honeycomb structures; Finite element analysis; Hierarchical honeycomb structures; Honeycomb structures; Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Gandhi, N. (2015). FINITE ELEMENT ANALYSIS OF EFFECTIVE MECHANICAL PROPERTIES OF HIERARCHICAL HONEYCOMB STRUCTURES. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/2216
Chicago Manual of Style (16th Edition):
Gandhi, Ninad. “FINITE ELEMENT ANALYSIS OF EFFECTIVE MECHANICAL PROPERTIES OF HIERARCHICAL HONEYCOMB STRUCTURES.” 2015. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/2216.
MLA Handbook (7th Edition):
Gandhi, Ninad. “FINITE ELEMENT ANALYSIS OF EFFECTIVE MECHANICAL PROPERTIES OF HIERARCHICAL HONEYCOMB STRUCTURES.” 2015. Web. 24 Jan 2021.
Vancouver:
Gandhi N. FINITE ELEMENT ANALYSIS OF EFFECTIVE MECHANICAL PROPERTIES OF HIERARCHICAL HONEYCOMB STRUCTURES. [Internet] [Masters thesis]. Clemson University; 2015. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/2216.
Council of Science Editors:
Gandhi N. FINITE ELEMENT ANALYSIS OF EFFECTIVE MECHANICAL PROPERTIES OF HIERARCHICAL HONEYCOMB STRUCTURES. [Masters Thesis]. Clemson University; 2015. Available from: https://tigerprints.clemson.edu/all_theses/2216
Clemson University
14.
Hariharan, Anand.
FRICTION STIR WELDING (FSW) PROCESS MODELING AND FSW JOINT DESIGN FOR BLAST SURVIVABLE STRUCTURES.
Degree: MS, Mechanical Engineering, 2011, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/1193
► In order to satisfy the need for better ballistic performance against lethal threats, new grades of Titanium (e.g. Ti-6Al-4V) and Aluminum (e.g. AA5083) alloys are…
(more)
▼ In order to satisfy the need for better ballistic performance against lethal threats, new grades of Titanium (e.g. Ti-6Al-4V) and Aluminum (e.g. AA5083) alloys are being employed in the design of blast survivable structures. These better performing alloys are not readily amenable to conventional welding process or result in inferior welds when joined using conventional welding process. On the other hand, Friction Stir Welding (FSW), a relatively new welding process, has been found to be successful in producing good quality welds in these alloys. FSW also offers better weld performance in comparison with the conventional welding process. But the methodology for employing FSW to weld blast survivable structures remains unexplored. Therefore a robust and cost-efficient three-step process to Friction-Stir-Weld blast survivable structures is introduced in the present work. The first step in the proposed three-step methodology is to identify the FSW process parameters and tool design parameters that results in best quality welds and maximum productivity of the process. Since a purely experimental investigation of FSW process is expensive, computational Finite-Element-Analysis (FEA) procedures are incorporated in the methodology to reduce the amount of experimental investigation required. A fully-coupled thermo-mechanical FEA procedure is employed to investigate the spatial distribution and temporal evolution of material properties/microstructure with the FSW joints of Aluminum (AA5083) and Titanium (Ti-6Al-4V) work-pieces. In case of Ti-6Al-4V, the thermal history result from the computational analysis is used to determine the temporal evolution of the material microstructure in the weakest Heat-Affected-Zone (HAZ) region. Based on the well-established property vs. microstructure relationship for Ti-6Al-4V, and the temporal evolution of material microstructure for HAZ region, the overall structural performance of the weld is predicted. The computational results are compared with their corresponding experimental results found in open literature, and are found to be agreeable. In the second step, the optimal weld joint designs used in different regions of the blast survivable structures are identified. In the third step, problems regarding sub-scale modeling of blast survivable vehicle test structures are analyzed. The results obtained are used to analyze the potential of the current approach in enhancing blast survivability of military structures.
Advisors/Committee Members: Grujicic, Mica, Li , Gang, Ochterbeck , Jay.
Subjects/Keywords: Finite Element Analysis; Friction Stir Welding; Military-vehicle Structures; Process Development; Ti-6Al-4V; Weld Microstructure/Properties Prediction; Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hariharan, A. (2011). FRICTION STIR WELDING (FSW) PROCESS MODELING AND FSW JOINT DESIGN FOR BLAST SURVIVABLE STRUCTURES. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1193
Chicago Manual of Style (16th Edition):
Hariharan, Anand. “FRICTION STIR WELDING (FSW) PROCESS MODELING AND FSW JOINT DESIGN FOR BLAST SURVIVABLE STRUCTURES.” 2011. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/1193.
MLA Handbook (7th Edition):
Hariharan, Anand. “FRICTION STIR WELDING (FSW) PROCESS MODELING AND FSW JOINT DESIGN FOR BLAST SURVIVABLE STRUCTURES.” 2011. Web. 24 Jan 2021.
Vancouver:
Hariharan A. FRICTION STIR WELDING (FSW) PROCESS MODELING AND FSW JOINT DESIGN FOR BLAST SURVIVABLE STRUCTURES. [Internet] [Masters thesis]. Clemson University; 2011. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/1193.
Council of Science Editors:
Hariharan A. FRICTION STIR WELDING (FSW) PROCESS MODELING AND FSW JOINT DESIGN FOR BLAST SURVIVABLE STRUCTURES. [Masters Thesis]. Clemson University; 2011. Available from: https://tigerprints.clemson.edu/all_theses/1193
Clemson University
15.
Telukunta, Rohit.
CONSTRAINED LAYER DAMPING OF HONEYCOMB COMPOSITE STRUCTURES.
Degree: MS, Mechanical Engineering, 2011, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/1162
► Composite sandwich structures have replaced homogenous dense solids in many applications due to their advantages of high stiffness to weight ratio, and higher damping characteristics.…
(more)
▼ Composite sandwich structures have replaced homogenous dense solids in many applications due to their advantages of high stiffness to weight ratio, and higher damping characteristics. Higher damping in engineering applications is desirable to reduce structural vibrations. The application of a viscoelastic layer between two thin face sheets gives rise to the concept of constrained layer damping which is an effective technique to achieve increased damping in engineering applications. Honeycomb cellular structures are often used for the core in sandwich construction because of their low density and high stiffness properties. Regular honeycombs are defined by conventional hexagonal geometry, which gives rise to effective transversely isotropic properties. Auxetic honeycombs have cellular geometry defined such that their effective Poisson's ratio is negative, and have potential for increased shear modulus and nonconventional design compared to their regular counterparts. In this study, the damping nature of auxetic and regular honeycombs cores within a sandwich plate structure with equal mass density is studied using finite element analysis. A new concept of constrained layer damping is introduced within the honeycomb cell walls, making the honeycomb core, itself, a composite structure. By introducing the composite honeycomb core between two thin face sheets in the macro sandwich structure, further increases in damping can be achieved. The thickness of the constraining layers is defined such that the effective stiffness is increased for the same mass of a sandwich plate with homogeneous honeycomb core. Comparisons are made for both quasi-static cyclic loading and dynamic analysis subjected to impact loads. The amplitude of loading is defined at a level such that the yield stress within the base materials is not exceeded. Dissipation energy at the end of the loading step in the finite element analysis is used to quantify the structural loss factor. Results show higher damping is achieved with the novel concept of constrained layer viscoelastic damping in honeycomb cell walls. In the case of out-of-plane loading direction, sandwich plates with composite auxetic honeycomb core gives higher damping over homogeneous honeycomb core sandwich plates and its regular honeycomb counter parts. However, when loaded in the in-plane direction, a condition was found where sandwich plates with homogenous auxetic honeycomb core gave higher damping than with a composite core and its regular counter parts, suggesting that further development is needed to optimize the relative thicknesses of the constraining layer in the honeycomb cell walls.
Advisors/Committee Members: THOMPSON, LONNY L, LI , GANG, FADEL , GEORGES M.
Subjects/Keywords: Composite; Constrained Layer Damping; Damping; Honeycomb; Loss factor; Sandwich plates; Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Telukunta, R. (2011). CONSTRAINED LAYER DAMPING OF HONEYCOMB COMPOSITE STRUCTURES. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1162
Chicago Manual of Style (16th Edition):
Telukunta, Rohit. “CONSTRAINED LAYER DAMPING OF HONEYCOMB COMPOSITE STRUCTURES.” 2011. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/1162.
MLA Handbook (7th Edition):
Telukunta, Rohit. “CONSTRAINED LAYER DAMPING OF HONEYCOMB COMPOSITE STRUCTURES.” 2011. Web. 24 Jan 2021.
Vancouver:
Telukunta R. CONSTRAINED LAYER DAMPING OF HONEYCOMB COMPOSITE STRUCTURES. [Internet] [Masters thesis]. Clemson University; 2011. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/1162.
Council of Science Editors:
Telukunta R. CONSTRAINED LAYER DAMPING OF HONEYCOMB COMPOSITE STRUCTURES. [Masters Thesis]. Clemson University; 2011. Available from: https://tigerprints.clemson.edu/all_theses/1162
Clemson University
16.
Annapaneni, Puroorava.
MOLECULAR DYNAMICS STUDY OF PARTICLE IMPACT INDUCED BOND BREAKING OF SINGLE-WALLED CARBON NANOTUBES AND QUALITY FACTORS OF NANOCOMPOSITE STRUCTURES.
Degree: MS, Mechanical Engineering, 2011, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/1163
► Part A Injection of particles to the side wall of single-walled carbon nanotubes (SWCNT) has been employed for doping and storage of particles on SWCNTs.…
(more)
▼ Part A Injection of particles to the side wall of single-walled carbon nanotubes (SWCNT) has been employed for doping and storage of particles on SWCNTs. In addition, particle bombardment can be used to cut and modify graphene structures. While the collision of hydrogen atoms with SWCNTs has been extensively studied, collision dynamic behavior of heavy particles with SWCNTs has not been well understood. To facilitate a better understanding of the particle-SWCNT collision process, in this work, we study the impact of five noble gas atoms (He, Ne, Ar, Kr, Xe) with SWCNTs and investigate particle impact induced CNT bond breaking phenomena. Simulation results include the bond-breaking kinetic energy ranges of the incident atoms with reflection and penetration after the collision. Effect of chirality, boundary and strain conditions of the SWCNTs and energy exchange between the incident atoms and carbon atoms of SWCNT are investigated. Simulation results show that, except for very small SWCNTs (diameter < 0.5 nm), the minimum bond-breaking energy of the incident atom is independent of the chirality/diameter and boundary conditions of the SWCNT. However, the incident atom mass as well as strain conditions of the SWCNT plays an important role in the minimum bond-breaking energy, collision behavior and energy loss of the incident atom. Part B Nanocomposite materials are increasingly used in the resonators in Nanoelectromechanical systems (NEMS). While nanoresonators' ability to attain high fundamental frequencies with excellent mechanical response makes them useful for high performance sensing, a critical performance measure is the quality factor of the resonator. While quality factors of single crystal materials have been extensively studied, few work has been done on the analysis of quality factors of nanocomposites. In this work, we investigate the characteristics of intrinsic energy dissipation in nanocomposite resonators using classical molecular dynamics. The quality factors, and thereby energy dissipation rate, of various silicon and germanium configurations are calculated. The relationship between the quality factor and the temperature, material configuration and interface area are investigated. Simulation results indicate that, due to the strong phonon scattering in the nanocomposite beams, the characteristics of the quality factor variation can not be described by the classical thermoelastic energy dissipation theory. The component material interface plays a major role in the quality factor of the beams. The disadvantageous effect of the interface area is significant, especially at lower temperatures.
Advisors/Committee Members: Li, Gang, Thompson , Lonny L, Huang , Yong.
Subjects/Keywords: bond breaking; Carbon nanotubes; collision dynamics; molecular dynamics; nanocomposites; quality factors; Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Annapaneni, P. (2011). MOLECULAR DYNAMICS STUDY OF PARTICLE IMPACT INDUCED BOND BREAKING OF SINGLE-WALLED CARBON NANOTUBES AND QUALITY FACTORS OF NANOCOMPOSITE STRUCTURES. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1163
Chicago Manual of Style (16th Edition):
Annapaneni, Puroorava. “MOLECULAR DYNAMICS STUDY OF PARTICLE IMPACT INDUCED BOND BREAKING OF SINGLE-WALLED CARBON NANOTUBES AND QUALITY FACTORS OF NANOCOMPOSITE STRUCTURES.” 2011. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/1163.
MLA Handbook (7th Edition):
Annapaneni, Puroorava. “MOLECULAR DYNAMICS STUDY OF PARTICLE IMPACT INDUCED BOND BREAKING OF SINGLE-WALLED CARBON NANOTUBES AND QUALITY FACTORS OF NANOCOMPOSITE STRUCTURES.” 2011. Web. 24 Jan 2021.
Vancouver:
Annapaneni P. MOLECULAR DYNAMICS STUDY OF PARTICLE IMPACT INDUCED BOND BREAKING OF SINGLE-WALLED CARBON NANOTUBES AND QUALITY FACTORS OF NANOCOMPOSITE STRUCTURES. [Internet] [Masters thesis]. Clemson University; 2011. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/1163.
Council of Science Editors:
Annapaneni P. MOLECULAR DYNAMICS STUDY OF PARTICLE IMPACT INDUCED BOND BREAKING OF SINGLE-WALLED CARBON NANOTUBES AND QUALITY FACTORS OF NANOCOMPOSITE STRUCTURES. [Masters Thesis]. Clemson University; 2011. Available from: https://tigerprints.clemson.edu/all_theses/1163
Clemson University
17.
Sridharan, Sriram.
JOULE HEATING EFFECTS ON ELECTROKINETIC TRANSPORT IN CONSTRICTION MICROCHANNELS.
Degree: MS, Mechanical Engineering, 2011, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/1061
► Microfluidic technology involving multidisciplinary studies including MEMS, chemistry, physics, fluids and heat transfer has been developed into a promising research field in the recent decade.…
(more)
▼ Microfluidic technology involving multidisciplinary studies including MEMS, chemistry, physics, fluids and heat transfer has been developed into a promising research field in the recent decade. If offers many advantages over conventional laboratory techniques like reduced reagent consumption, faster analysis, easy fabrication and low chemical waste. Microfluidic lab-on-a-chip devices have been used to manipulate cells and particles like sorting, separating, trapping, mixing and lysing. Microfluidic manipulation can be achieved through many methods and insulator based dielectrophoresis (iDEP) is one of the highly used method in the recent years. In iDEP, both DC and AC voltages can be applied to the remote electrodes positioned in end-channel reservoirs for transporting and manipulating particles. The electric field gradients are caused by the blockage of electric current due to in-channel hurdles, posts, and ridges. However, iDEP devices suffer from the issue of Joule heating due to locally amplified electric field around the insulators. A parametric study of Joule heating effects on electroosmotic fluid flow in iDEP is studied under various electric fields. It was determined that depending upon the magnitude of DC voltage, a pair of counter rotating vortices fluid circulations can occur at either downstream end or each end of the channel constriction. Moreover, pair at the downstream end appears larger in size than the upstream end due to DC electroosmotic flow. A numerical model is developed to simulate the fluid circulations occurred due to the action of electric field on Joule heating induced fluid inhomogeneities in the constriction region. Focusing particles or cells into a single stream is usually a necessary step prior to counting and separating them in microfluidic devices such as flow cytometers and cell sorters. A systematic study of Joule heating effects on electrokinetic particle transport in constriction microchannels under DC and DC biased AC electric fields is presented in this work. A numerical model is developed to capture the particle trace observed in the experiments. It was determined that particle transport is greatly affected by electrothermal effects where Joule heating is high. At very low DC magnitude where the electrothermal effects dominate the electrokinetic flow, particles in the shallow depth channel are being trapped and particles in deep channels are transported to the downstream reservoir from the constriction in a single streamline. Electrothermal flow circulations should be taken into account in the design and operation of iDEP devices, especially when highly conductive solutions and large electric fields must be employed. They may potentially be harnessed to enhance microfluidic mixing and immunoassay for lab-on-a-chip applications. A numerical study of Joule heating effects on the sample mixing performance in constriction microchannels is presented in this work. It was determined that Joule heating induced electrothermal…
Advisors/Committee Members: Xuan, Xiangchun, Miller , Richard, Li , Gang.
Subjects/Keywords: Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Sridharan, S. (2011). JOULE HEATING EFFECTS ON ELECTROKINETIC TRANSPORT IN CONSTRICTION MICROCHANNELS. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1061
Chicago Manual of Style (16th Edition):
Sridharan, Sriram. “JOULE HEATING EFFECTS ON ELECTROKINETIC TRANSPORT IN CONSTRICTION MICROCHANNELS.” 2011. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/1061.
MLA Handbook (7th Edition):
Sridharan, Sriram. “JOULE HEATING EFFECTS ON ELECTROKINETIC TRANSPORT IN CONSTRICTION MICROCHANNELS.” 2011. Web. 24 Jan 2021.
Vancouver:
Sridharan S. JOULE HEATING EFFECTS ON ELECTROKINETIC TRANSPORT IN CONSTRICTION MICROCHANNELS. [Internet] [Masters thesis]. Clemson University; 2011. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/1061.
Council of Science Editors:
Sridharan S. JOULE HEATING EFFECTS ON ELECTROKINETIC TRANSPORT IN CONSTRICTION MICROCHANNELS. [Masters Thesis]. Clemson University; 2011. Available from: https://tigerprints.clemson.edu/all_theses/1061
Clemson University
18.
Choragudi, Aditya sai nag.
Finite Element Analysis Prediction of Stresses in H.L. Hunley Submarine by Global-to-Local Model Coordination.
Degree: MS, Mechanical Engineering, 2011, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/1074
► H.L Hunley was a submarine of the Confederate States of America that participated in the American Civil War. On February 17, 1864, H.L.Hunley created history…
(more)
▼ H.L Hunley was a submarine of the Confederate States of America that participated in the American Civil War. On February 17, 1864, H.L.Hunley created history by becoming the first submarine to sink a enemy ship after its attack on USS Houstanic. After Hunley never returned to the shore and the details of its wreck were unknown. On August 8, 2000, H. L Hunley was brought to the surface after 136 years of its wreckage. The submarine is currently at the Warren Lasch Conservation Center located in Charleston. This study focuses on the structural analysis of the H.L Hunley submarine to predict stresses and potential structural failure. Modeling the structure is challenging because of (1) the lack of symmetry due to its current position, (2) non-uniformity due to high corrosion, and (3) the riveted connections with more than 4000 rivets. Although connections between plates in ships are generally considered stronger and stiffer than the rest of the structure, this assumption is assumed to be invalid in the case of the Hunley because of the high and non-uniform corrosion. Since modeling the entire submarine and its 4000 rivet is impossible, the purpose of this study is to create a coordination procedure between the global model of the submarine with simplified connections and the local model of a riveted connection to affectively predict the stresses. The Global model is the whole submarine modeled using shell elements to decrease complexity. The local model consists of one of the riveted connections in the submarine. The validation of the procedure is discussed.
Advisors/Committee Members: Blouin, Vincent, Li , Gang, Miller , Richard, Thompson , Lonny.
Subjects/Keywords: Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Choragudi, A. s. n. (2011). Finite Element Analysis Prediction of Stresses in H.L. Hunley Submarine by Global-to-Local Model Coordination. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1074
Chicago Manual of Style (16th Edition):
Choragudi, Aditya sai nag. “Finite Element Analysis Prediction of Stresses in H.L. Hunley Submarine by Global-to-Local Model Coordination.” 2011. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/1074.
MLA Handbook (7th Edition):
Choragudi, Aditya sai nag. “Finite Element Analysis Prediction of Stresses in H.L. Hunley Submarine by Global-to-Local Model Coordination.” 2011. Web. 24 Jan 2021.
Vancouver:
Choragudi Asn. Finite Element Analysis Prediction of Stresses in H.L. Hunley Submarine by Global-to-Local Model Coordination. [Internet] [Masters thesis]. Clemson University; 2011. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/1074.
Council of Science Editors:
Choragudi Asn. Finite Element Analysis Prediction of Stresses in H.L. Hunley Submarine by Global-to-Local Model Coordination. [Masters Thesis]. Clemson University; 2011. Available from: https://tigerprints.clemson.edu/all_theses/1074
Clemson University
19.
Nainar, Naveen.
ACOUSTIC PERFORMANCE OF REITERATED HIERARCHICAL HONEYCOMB STRUCTURES.
Degree: MS, Mechanical Engineering, 2015, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/2238
► Sandwich panels constructed from honeycomb structures have been found to reduce sound transmission and improve vibration isolation. In this work, reiterated hierarchical honeycomb structures have…
(more)
▼ Sandwich panels constructed from honeycomb structures have been found to reduce sound transmission and improve vibration isolation. In this work, reiterated hierarchical honeycomb structures have been modeled for the core in sandwich panels and studied for sound transmission properties using finite element analysis. Several honeycomb unit cell geometries are considered, including, regular hexagonal, auxetic with properties of negative Poisson’s ratio, and different reiterated hierarchical structures. Previous studies have shown that auxetic honeycomb structures exhibit improved sound transmission loss compared to regular honeycomb sandwich panels. Two different orientations of the honeycomb unit cell geometry have been studied, namely, the zigzag and armchair configurations, which are, rotated 90 degrees. Both regular and auxetic honeycombs have been used in both these configurations. The finite element model of the panels are used to extract natural frequencies and mode shapes and to perform steady state frequency response dynamic analysis up to 1000 Hz. The transmitted sound pressure levels on the surface of each structure is extracted and compared to study the influence of the reiterated hierarchy on sound transmission characteristics. The influence of corner reinforcement constructed by subtracting interior high-level hierarchical structure except at the vertices of the underlying lower-level honeycomb unit cell was also studied. Furthermore, a study was conducted to quantify the effect of changing the ratio of cell-wall thickness between various levels of hierarchy. Special focus on the limiting case of level-1 hierarchy with zero level-0 thickness is also studied. In all cases, the total mass was kept constant in order to isolate only stiffness and mass distribution effects. The results show that introduction of reiterated hierarchy in level-1 structures reduced the sound transmission of honeycomb sandwich panels compared to parent level-0 geometry. Results also showed that the corner reinforcement does not influence the sound transmission characteristics significantly, but does change the stiffness of the structure. For regular hexagonal honeycombs, changing the ratio of thickness between various levels of hierarchy did not affect the sound transmission significantly but made the structure stiffer when the ratio was increased, and reduced the stiffness when the ratio was decreased. For auxetic honeycomb structure, increasing the ratio made the structure less stiff, but reducing the ratio did not change the stiffness significantly.
Advisors/Committee Members: Thompson, Lonny L, Li, Gang, Summers, Joshua D.
Subjects/Keywords: Hierarchical; Honeycomb; Reiterated; Sandwich panel; Sound pressure; Structural acoustics; Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Nainar, N. (2015). ACOUSTIC PERFORMANCE OF REITERATED HIERARCHICAL HONEYCOMB STRUCTURES. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/2238
Chicago Manual of Style (16th Edition):
Nainar, Naveen. “ACOUSTIC PERFORMANCE OF REITERATED HIERARCHICAL HONEYCOMB STRUCTURES.” 2015. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/2238.
MLA Handbook (7th Edition):
Nainar, Naveen. “ACOUSTIC PERFORMANCE OF REITERATED HIERARCHICAL HONEYCOMB STRUCTURES.” 2015. Web. 24 Jan 2021.
Vancouver:
Nainar N. ACOUSTIC PERFORMANCE OF REITERATED HIERARCHICAL HONEYCOMB STRUCTURES. [Internet] [Masters thesis]. Clemson University; 2015. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/2238.
Council of Science Editors:
Nainar N. ACOUSTIC PERFORMANCE OF REITERATED HIERARCHICAL HONEYCOMB STRUCTURES. [Masters Thesis]. Clemson University; 2015. Available from: https://tigerprints.clemson.edu/all_theses/2238
Clemson University
20.
Bode, Roger.
Parametric Amplification in the Context of Vibratory Energy Harvesting.
Degree: MS, Mechanical Engineering, 2011, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/1134
► Using a vibratory energy harvester (VEH) to independently power a sensor has become an increasingly popular topic due to the small amount of power current…
(more)
▼ Using a vibratory energy harvester (VEH) to independently power a sensor has become an increasingly popular topic due to the small amount of power current sensors require to operate. This can be achieved by scavenging energy from the ambient environment where the sensor is located. Numerous linear and nonlinear energy harvesters have been proposed in order to deal with various vibratory environments, along with improving the power production and/or bandwidth of the device. In this thesis, we propose a technique to harvest energy from excitation sources that possess two frequency components: a fundamental component with large energy content, and a super-harmonic component with smaller energy content at twice the fundamental component. Excitations of this nature are common in the environment due to inherent nonlinearities in the dynamics of the excitation source. Normally, two separate energy harvesters are needed to extract the energy at each frequency; however, this thesis discusses a single cantilevered piezoelectric VEH that exploits the parametric amplification phenomenon to scavenge energy from both frequencies by varying the tilt angle between the axis of the beam and the direction of the excitation. To investigate the efficacy of the proposed concept, the equations governing the electromechanical dynamics of the harvester are derived. The resulting partial differential equations and associated boundary conditions are then reduced to a single-mode Galerkin-based reduced-order model. Analytical expressions for the steady-state output power across a purely resistive load are obtained using the method of multiple scales. Theoretical and experimental results demonstrate that parametric amplification can be used to improve the output power for given excitation parameters, beam tilt angle, and mechanical damping ratio. It is observed that there exists an optimal beam tilt angle at which the flow of energy from the environment to the electric load is maximized. This angle increases as the amplitude of the super-harmonic component of excitation increases and the mechanical damping ratio decreases. Furthermore, the resistive load of the harvesting circuit, which significantly affects the output power, is shown to have little influence on the optimal tilt angle except for very low mechanical damping ratios. Therefore, for a given environment and system parameters, an optimal tilt angle and resistive load combinations should be maintained to maximize the power output of the harvester. Results indicate that the mechanical damping ratio plays a major role in characterizing the performance. Specifically, when the mechanical damping ratio is small, significant enhancement in the output power is attainable even when the magnitude of the super-harmonic is small as compared to the fundamental component. For instance, at a damping ratio of ζ=0.002, a 20% increase in power is observed at the optimal tilt angle when the super-harmonic component is half that of the…
Advisors/Committee Members: Daqaq, Mohammed F, Li , Gang, Vahidi , Ardalan.
Subjects/Keywords: Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Bode, R. (2011). Parametric Amplification in the Context of Vibratory Energy Harvesting. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1134
Chicago Manual of Style (16th Edition):
Bode, Roger. “Parametric Amplification in the Context of Vibratory Energy Harvesting.” 2011. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/1134.
MLA Handbook (7th Edition):
Bode, Roger. “Parametric Amplification in the Context of Vibratory Energy Harvesting.” 2011. Web. 24 Jan 2021.
Vancouver:
Bode R. Parametric Amplification in the Context of Vibratory Energy Harvesting. [Internet] [Masters thesis]. Clemson University; 2011. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/1134.
Council of Science Editors:
Bode R. Parametric Amplification in the Context of Vibratory Energy Harvesting. [Masters Thesis]. Clemson University; 2011. Available from: https://tigerprints.clemson.edu/all_theses/1134
Clemson University
21.
Cheruku, Bargav.
MODELING AND FINITE ELEMENT ALAYSIS OF FLUID STRUCTURE INTERACTION IN A WIND ENERGY HARVESTER.
Degree: MS, Mechanical Engineering, 2011, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/1161
► An energy harvesting system inspired by musicplaying harmonicas was developed for microwind power generation. The energy harvester uses flow-induced self-sustained oscillations of a piezoelectric beam…
(more)
▼ An energy harvesting system inspired by musicplaying harmonicas was developed for microwind power generation. The energy harvester uses flow-induced self-sustained oscillations of a piezoelectric beam embedded within a chamber to generate electric power. While the power generation capability of the energy harvester has been demonstrated previously, there is a lack of understanding behind the basic physics of the driving mechanism responsible for the self-sustained oscillations. In addition, the performance of the nonlinear multi-physics system with strong fluid and structure coupling depends on many physical and design parameters. A systematic study on the effects of these parameters is necessary for the design and optimization of the energy harvester. To address these issues, this study focuses on the modeling and finite element analysis of fluid-structure interaction in the wind energy harvester. A full 3-D finite element model is constructed for the device. The fundamental mechanism of the fluid-structure interaction in the device that results in the self-sustained beam vibration is investigated. It is found that the compressibility of the fluid is the key factor. The result indicates that the beam vibration in the wind energy harvester cannot be sustained in incompressible fluids. By using the finite element model, the effects of a set of physical and design parameters, such as the fluid viscosity, chamber volume, side gap and configuration of the beam at the outlet, are studied. Based on the numerical analysis results, a new design of the beam is proposed to obtain a larger deflection of the beam under the given air pressure in the chamber. The increase of the beam deflection will induce a larger strain in the piezoelectric layer and a larger output voltage of the energy harvester, which is desired in many applications.
Advisors/Committee Members: LI, GANG, DAQAQ , MOHAMMED, THOMPSON , LONNY.
Subjects/Keywords: ANSYS CFX; ENERGY HARVESTING; FINITE ELEMENT ANALYSIS; FLUID STRUCTURE INTERACTION; REDUCED ORDER MODELING; SELF SUSTAINED OSCILLATIONS; Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Cheruku, B. (2011). MODELING AND FINITE ELEMENT ALAYSIS OF FLUID STRUCTURE INTERACTION IN A WIND ENERGY HARVESTER. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1161
Chicago Manual of Style (16th Edition):
Cheruku, Bargav. “MODELING AND FINITE ELEMENT ALAYSIS OF FLUID STRUCTURE INTERACTION IN A WIND ENERGY HARVESTER.” 2011. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/1161.
MLA Handbook (7th Edition):
Cheruku, Bargav. “MODELING AND FINITE ELEMENT ALAYSIS OF FLUID STRUCTURE INTERACTION IN A WIND ENERGY HARVESTER.” 2011. Web. 24 Jan 2021.
Vancouver:
Cheruku B. MODELING AND FINITE ELEMENT ALAYSIS OF FLUID STRUCTURE INTERACTION IN A WIND ENERGY HARVESTER. [Internet] [Masters thesis]. Clemson University; 2011. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/1161.
Council of Science Editors:
Cheruku B. MODELING AND FINITE ELEMENT ALAYSIS OF FLUID STRUCTURE INTERACTION IN A WIND ENERGY HARVESTER. [Masters Thesis]. Clemson University; 2011. Available from: https://tigerprints.clemson.edu/all_theses/1161
Clemson University
22.
Mor, Arun.
ACOUSTIC SCATTERING RESPONSE OF HIERARCHIC HONEYCOMB STRUCTURES FOR CYLINDRICAL AND SPHERICAL STRUCTURES.
Degree: MS, Mechanical Engineering, 2015, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/2187
► Sandwich panels with honeycomb core are often employed in structures for improved mechanical properties with lightweight. Honeycombs are defined by non-overlapping and periodic unit cells.…
(more)
▼ Sandwich panels with honeycomb core are often employed in structures for improved mechanical properties with lightweight. Honeycombs are defined by non-overlapping and periodic unit cells. Most research conducted on these sandwich panels focuses on stiffness and strength properties. The acoustic aspect of these panels has been focused on sound transmission loss. For acoustics, previous studies used effective honeycomb orthotropic elastic moduli based on Cartesian unit cell geometry to model the core as a homogeneous structure. While efficient, this modeling approach loses accuracy at higher frequencies. Furthermore, when used for curved panels, the effective moduli are only approximate. In this work, mechanical and acoustic characteristics of cylindrical and spherical honeycomb panels are studied using finite element analysis. The unit cell geometry core is oriented both radially and in the transverse direction. The models are analyzed for sound scattering measured by target strength with interactions between structure and the acoustic medium through coupling between the domains. Both air and water are compared for the acoustic region. Different honeycomb core geometries varying in the hexagon arrangement, number of unit cells and level of hierarchy are studied. The structures developed are constrained to have the same total mass allowing for comparisons based on only changes in stiffness properties. The effect of face sheet thickness on the mechanical and acoustic properties of the curved sandwich structures is also studied. The vibration and acoustic scattering behavior of these structures have been investigated for natural frequencies between 1-1000 Hz to predict and understand the different responses near and at resonances. The target strength response of the structures has been studied in the near field at both front and back of the structures. The effect of acoustic coupling is observed clearly on varying the outer domains properties between air and water. It is noted that the acoustic scattering characteristics of the structures depend on the frequency of the incident wave and acoustic domain properties interacting with structures. When comparing honeycomb structures to a homogeneous structure with the same mass, for cylindrical structures the first few natural frequencies are lower compared to the reference homogeneous structure, and then increases for higher modes. In the case of the spherical structure, this behavior was reversed indicating the interaction between in-plane and out-of-plane stiffness of the 3-D sphere compared to the 2-D cylinder modes.
Advisors/Committee Members: Thompson, Lonny L, Li, Gang, Summers, Joshua D.
Subjects/Keywords: Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Mor, A. (2015). ACOUSTIC SCATTERING RESPONSE OF HIERARCHIC HONEYCOMB STRUCTURES FOR CYLINDRICAL AND SPHERICAL STRUCTURES. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/2187
Chicago Manual of Style (16th Edition):
Mor, Arun. “ACOUSTIC SCATTERING RESPONSE OF HIERARCHIC HONEYCOMB STRUCTURES FOR CYLINDRICAL AND SPHERICAL STRUCTURES.” 2015. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/2187.
MLA Handbook (7th Edition):
Mor, Arun. “ACOUSTIC SCATTERING RESPONSE OF HIERARCHIC HONEYCOMB STRUCTURES FOR CYLINDRICAL AND SPHERICAL STRUCTURES.” 2015. Web. 24 Jan 2021.
Vancouver:
Mor A. ACOUSTIC SCATTERING RESPONSE OF HIERARCHIC HONEYCOMB STRUCTURES FOR CYLINDRICAL AND SPHERICAL STRUCTURES. [Internet] [Masters thesis]. Clemson University; 2015. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/2187.
Council of Science Editors:
Mor A. ACOUSTIC SCATTERING RESPONSE OF HIERARCHIC HONEYCOMB STRUCTURES FOR CYLINDRICAL AND SPHERICAL STRUCTURES. [Masters Thesis]. Clemson University; 2015. Available from: https://tigerprints.clemson.edu/all_theses/2187
Clemson University
23.
Veeramurthy, Mallikarjun.
Modeling, finite element analysis, and optimization of Non-Pneumatic Tire (NPT) for the minimization of rolling resistance.
Degree: MS, Mechanical Engineering, 2011, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/1154
► Recently, the development of non-pneumatic tires (NPT) such as the Michelin Tweel is receiving increased attention due to potential advantages over pneumatic tires such as…
(more)
▼ Recently, the development of non-pneumatic tires (NPT) such as the Michelin Tweel is receiving increased attention due to potential advantages over pneumatic tires such as low mass, no run flat, good contact pressure distribution, and low rolling resistance (RR). This study focuses on the design of a NPT based on properties of vertical stiffness, contact pressure, and rolling energy loss. Using a finite element (FE) model, a parametric study is conducted to study the effect on vertical stiffness, contact pressure, and rolling resistance (RR) response considering three design variables: (1) thickness of the spokes, (2) the shear band thickness, and (3) shear modulus of the shear band and spokes of the NPT. The first two design variables are geometric parameters of the NPT while the third design variable is a material parameter. Using the three design variables, a design of experiments (DOE) is performed to study the effect on RR, contact pressure, and vertical displacement. Results from the DOE are used to create response surface models (RSM) for the objective function (minimal RR) and constraints on vertical deflection and contact pressure. The analytical RSM function is optimized for minimizing the rolling loss subjected to the given constraints. In addition, a design sensitivity study is performed to evaluate the influence of the design variables on the output response. Results indicate that all the design variables have significant effect on RR, with the shear band thickness and shear modulus having the greater effect.
Advisors/Committee Members: Thompson, Lonny, Ju , Jaehyung, Summers , Joshua, Li , Gang.
Subjects/Keywords: Non-pneumatic tire; NPT; Optimization; Rolling resistance; Tire; Tweel; Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Veeramurthy, M. (2011). Modeling, finite element analysis, and optimization of Non-Pneumatic Tire (NPT) for the minimization of rolling resistance. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1154
Chicago Manual of Style (16th Edition):
Veeramurthy, Mallikarjun. “Modeling, finite element analysis, and optimization of Non-Pneumatic Tire (NPT) for the minimization of rolling resistance.” 2011. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/1154.
MLA Handbook (7th Edition):
Veeramurthy, Mallikarjun. “Modeling, finite element analysis, and optimization of Non-Pneumatic Tire (NPT) for the minimization of rolling resistance.” 2011. Web. 24 Jan 2021.
Vancouver:
Veeramurthy M. Modeling, finite element analysis, and optimization of Non-Pneumatic Tire (NPT) for the minimization of rolling resistance. [Internet] [Masters thesis]. Clemson University; 2011. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/1154.
Council of Science Editors:
Veeramurthy M. Modeling, finite element analysis, and optimization of Non-Pneumatic Tire (NPT) for the minimization of rolling resistance. [Masters Thesis]. Clemson University; 2011. Available from: https://tigerprints.clemson.edu/all_theses/1154
Clemson University
24.
Satterfield, Zachary.
Design of a Meta-Material with Targeted Nonlinear Deformation Response.
Degree: MS, Mechanical Engineering, 2015, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/2245
► The M1 Abrams tank contains track pads consist of a high density rubber. This rubber fails prematurely due to heat buildup caused by the hysteretic…
(more)
▼ The M1 Abrams tank contains track pads consist of a high density rubber. This rubber fails prematurely due to heat buildup caused by the hysteretic nature of elastomers. It is therefore desired to replace this elastomer by a meta-material that has equivalent nonlinear deformation characteristics without this primary failure mode. A meta-material is an artificial material in the form of a periodic structure that exhibits behavior that differs from its constitutive material. After a thorough literature review, topology optimization was found as the only method used to design meta-materials. Further investigation determined topology optimization as an infeasible method to design meta-materials with the targeted nonlinear deformation characteristics. Therefore, a method was developed in this thesis to logically and systematically design meta-material unit cells using engineering principles to achieve the desired nonlinear response. This method, called the Unit Cell Synthesis Method, requires the designer to have a fundamental understanding of the geometric nonlinearity of an elemental geometry. One or more of these elemental geometries are then systematically combined into a unit cell. A size optimization is performed on promising unit cell concepts to tune the geometry and converge its response towards that of the target. Application of this method was successful in generating a meta-material to meet the response of the rubber pad. The method represented in this thesis is meant to serve as a framework for future designers to develop meta-materials for nonlinear targeted responses.
Advisors/Committee Members: Fadel, Georges M, Li, Gang, Coutris, Nicole.
Subjects/Keywords: design; meta-material; method; nonlinear; response; Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Satterfield, Z. (2015). Design of a Meta-Material with Targeted Nonlinear Deformation Response. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/2245
Chicago Manual of Style (16th Edition):
Satterfield, Zachary. “Design of a Meta-Material with Targeted Nonlinear Deformation Response.” 2015. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/2245.
MLA Handbook (7th Edition):
Satterfield, Zachary. “Design of a Meta-Material with Targeted Nonlinear Deformation Response.” 2015. Web. 24 Jan 2021.
Vancouver:
Satterfield Z. Design of a Meta-Material with Targeted Nonlinear Deformation Response. [Internet] [Masters thesis]. Clemson University; 2015. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/2245.
Council of Science Editors:
Satterfield Z. Design of a Meta-Material with Targeted Nonlinear Deformation Response. [Masters Thesis]. Clemson University; 2015. Available from: https://tigerprints.clemson.edu/all_theses/2245
Clemson University
25.
Trikuta Srinath, Ashwin.
A novel approach to evaluating compact finite differences and similar tridiagonal schemes on GPU-accelerated clusters.
Degree: MS, Mechanical Engineering, 2015, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/2283
► Compact finite difference schemes are widely used in the direct numerical simulation of fluid flows for their ability to better resolve the small scales of…
(more)
▼ Compact finite difference schemes are widely used in the direct numerical simulation of fluid flows for their ability to better resolve the small scales of turbulence. However, they can be expensive to evaluate and difficult to parallelize. In this work, we present an approach for the computation of compact finite differences and similar tridiagonal schemes on graphics processing units (GPUs). We present a variant of the cyclic reduction algorithm for solving the tridiagonal linear systems that arise in such numerical schemes. We study the impact of the matrix structure on the cyclic reduction algorithm and show that precomputing forward reduction coefficients can be especially effective for obtaining good performance. Our tridiagonal solver is able to outperform the NVIDIA CUSPARSE and the multithreaded Intel MKL tridiagonal solvers on GPU and CPU respectively. In addition, we present a parallelization strategy for GPU-accelerated clusters, and show scalabality of a 3-D compact finite difference application for up to 64 GPUs on Clemson’s Palmetto cluster.
Advisors/Committee Members: Miller, Richard S, Thompson, Lonny, Li, Gang.
Subjects/Keywords: compact finite difference; computational fluid dynamics; direct numerical simulation; GPU; Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Trikuta Srinath, A. (2015). A novel approach to evaluating compact finite differences and similar tridiagonal schemes on GPU-accelerated clusters. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/2283
Chicago Manual of Style (16th Edition):
Trikuta Srinath, Ashwin. “A novel approach to evaluating compact finite differences and similar tridiagonal schemes on GPU-accelerated clusters.” 2015. Masters Thesis, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_theses/2283.
MLA Handbook (7th Edition):
Trikuta Srinath, Ashwin. “A novel approach to evaluating compact finite differences and similar tridiagonal schemes on GPU-accelerated clusters.” 2015. Web. 24 Jan 2021.
Vancouver:
Trikuta Srinath A. A novel approach to evaluating compact finite differences and similar tridiagonal schemes on GPU-accelerated clusters. [Internet] [Masters thesis]. Clemson University; 2015. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_theses/2283.
Council of Science Editors:
Trikuta Srinath A. A novel approach to evaluating compact finite differences and similar tridiagonal schemes on GPU-accelerated clusters. [Masters Thesis]. Clemson University; 2015. Available from: https://tigerprints.clemson.edu/all_theses/2283
Clemson University
26.
Chandrasekharan, Nataraj.
ELECTROMECHANICAL MODELING OF A HONEYCOMB CORE INTEGRATED VIBRATION ENERGY CONVERTER WITH INCREASED SPECIFIC POWER FOR ENERGY HARVESTING APPLICATIONS.
Degree: PhD, Mechanical Engineering, 2015, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/1558
► Innovation in integrated circuit technology along with improved manufacturing processes has resulted in considerable reduction in power consumption of electromechanical devices. Majority of these devices…
(more)
▼ Innovation in integrated circuit technology along with improved manufacturing processes has resulted in considerable reduction in power consumption of electromechanical devices. Majority of these devices are currently powered by batteries. However, the issues posed by batteries, including the need for frequent battery recharge/replacement has resulted in a compelling need for alternate energy to achieve self-sufficient device operation or to supplement battery power. Vibration based energy harvesting methods through piezoelectric transduction provides with a promising potential towards replacing or supplementing battery power source. However, current piezoelectric energy harvesters generate low specific power (power-to-weight ratio) when compared to batteries that the harvesters seek to replace or supplement. In this study, the potential of integrating lightweight cellular honeycomb structures with existing piezoelectric device configurations (bimorph) to achieve higher specific power is investigated. It is shown in this study that at low excitation frequency ranges, replacing the solid continuous substrate of a conventional piezoelectric bimorph with honeycomb structures of the same material results in a significant increase in power-to-weight ratio of the piezoelectric harvester. In order to maximize the electrical response of vibration based power harvesters, the natural frequency of these harvesters is designed to match the input driving frequency. The commonly used technique of adding a tip mass is employed to lower the natural frequency (to match driving frequency) of both, solid and honeycomb substrate bimorphs. At higher excitation frequency, the natural frequency of the traditional solid substrate bimorph can only be altered (to match driving frequency) through a change in global geometric design parameters, typically achieved by increasing the thickness of the harvester. As a result, the size of the harvester is increased and can be disadvantageous especially if the application imposes a space/size constraint. Moreover, the bimorph with increased thickness will now require a larger mechanical force to deform the structure which can fall outside the input ambient excitation amplitude range. In contrast, the honeycomb core bimorph offers an advantage in terms of preserving the global geometric dimensions. The natural frequency of the honeycomb core bimorph can be altered by manipulating honeycomb cell design parameters, such as cell angle, cell wall thickness, vertical cell height and inclined cell length. This results in a change in the mass and stiffness properties of the substrate and hence the bimorph, thereby altering the natural frequency of the harvester. Design flexibility of honeycomb core bimorphs is demonstrated by varying honeycomb cell parameters to alter mass and stiffness properties for power harvesting. The influence of honeycomb cell parameters on power generation is examined to evaluate optimum design to attain highest specific power. In addition, the more compliant nature of…
Advisors/Committee Members: Thompson, Lonny, Li, Gang, Daqaq, Mohammed, Zhao, Huijuan.
Subjects/Keywords: Energy harvesting; Honeycomb; Piezoelectric; Specific power; Vibration; Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chandrasekharan, N. (2015). ELECTROMECHANICAL MODELING OF A HONEYCOMB CORE INTEGRATED VIBRATION ENERGY CONVERTER WITH INCREASED SPECIFIC POWER FOR ENERGY HARVESTING APPLICATIONS. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/1558
Chicago Manual of Style (16th Edition):
Chandrasekharan, Nataraj. “ELECTROMECHANICAL MODELING OF A HONEYCOMB CORE INTEGRATED VIBRATION ENERGY CONVERTER WITH INCREASED SPECIFIC POWER FOR ENERGY HARVESTING APPLICATIONS.” 2015. Doctoral Dissertation, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_dissertations/1558.
MLA Handbook (7th Edition):
Chandrasekharan, Nataraj. “ELECTROMECHANICAL MODELING OF A HONEYCOMB CORE INTEGRATED VIBRATION ENERGY CONVERTER WITH INCREASED SPECIFIC POWER FOR ENERGY HARVESTING APPLICATIONS.” 2015. Web. 24 Jan 2021.
Vancouver:
Chandrasekharan N. ELECTROMECHANICAL MODELING OF A HONEYCOMB CORE INTEGRATED VIBRATION ENERGY CONVERTER WITH INCREASED SPECIFIC POWER FOR ENERGY HARVESTING APPLICATIONS. [Internet] [Doctoral dissertation]. Clemson University; 2015. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_dissertations/1558.
Council of Science Editors:
Chandrasekharan N. ELECTROMECHANICAL MODELING OF A HONEYCOMB CORE INTEGRATED VIBRATION ENERGY CONVERTER WITH INCREASED SPECIFIC POWER FOR ENERGY HARVESTING APPLICATIONS. [Doctoral Dissertation]. Clemson University; 2015. Available from: https://tigerprints.clemson.edu/all_dissertations/1558
Clemson University
27.
Xu, Yaoyao.
MODELING OF STRAIN EFFECT ON THERMAL AND ELECTRICAL TRANSPORT PROPERTIES OF SI/GE NANOCOMPOSITES AND ITS APPLICATIONS.
Degree: PhD, Mechanical Engineering, 2011, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/778
► Nanocomposites are composite materials which incorporate nanosized particles, platelets or fibers. The addition of nanosized phases into the bulk matrix can lead to significantly different…
(more)
▼ Nanocomposites are composite materials which incorporate nanosized particles, platelets or fibers. The addition of nanosized phases into the bulk matrix can lead to significantly different material properties compared to their macrocomposite counterparts. Due to their extraordinary properties, nanocomposites promise new applications in many fields such as ultra-high strength and ultra-light automotive parts, non-linear optics, biomedical applications, sensors and actuators, and thermoelectric devices. The design and fabrication of nanocomposite structures, devices and systems can be accelerated by developing accurate and efficient computational tools that can describe the properties and behavior of the nanocomposites. However, the development of such tools is challenging due to the multiscale nature of the materials. In addition, many devices where nanocomposites are employed are multiphysics systems with interactions of the mechanical, thermal and electrical energy domains. In such systems, while mechanical deformation is dependent on the temperature change, the thermal and electrical transport properties are functions of mechanical strain. In this work, we develop theoretical and computational models to address these issues and investigate the strain effect on the thermal and electrical transport properties in Si/Ge nanocomposites. We model strain effect on the phonon thermal conductivities in the Si/Ge nanocomposite materials by combining the strain dependent lattice dynamics and the ballistic phonon Boltzmann transport equation (BTE). The Seebeck coefficient and electrical conductivity of the Si/Ge nanocomposites are calculated by using an analytical model derived from the BTE under the relaxation-time approximation. The effect of strain is incorporated into the analytical model through strain induced energy shift and effective mass variation calculated from the deformation potential theory and a degenerate kp method at the zone-boundary X point. By using the models, strain effect on the thermoelectric figure of merit is investigated for n-type Si/Ge nanocomposite materials. Our calculations reveal that in the 300 − 800 K temperature range, uniaxial tensile strain along < 100 > direction increases dimensionless figure of merit parallel to the tension, and biaxial tensile strain along [100] and [010] directions decreases it at low temperatures and increases it at high temperatures in the tension directions. Shear strain and compressive uniaxial and biaxial strains decrease the figure of merit. At 800K with an electron concentration of 10
19/cm
3, 1% uniaxial tensile strain can increase the figure of merit of Si(0.8)Ge(0.2) nanocomposites by as much as 14%. In light of nanocomposites' high electrical to thermal conductivity ratio, we propose to use Si/Ge nanocomposite materials to improve the performance of micro thermal actuators. The high electrical to thermal conductivity ratio of Si/Ge nanocomposites is utilized to facilitate a rapid temperature change within a short distance,…
Advisors/Committee Members: Li, Gang, Biggers , Sherrill B., Joseph , Paul F., Thompson , Lonny L..
Subjects/Keywords: Nanoscience and Nanotechnology
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Xu, Y. (2011). MODELING OF STRAIN EFFECT ON THERMAL AND ELECTRICAL TRANSPORT PROPERTIES OF SI/GE NANOCOMPOSITES AND ITS APPLICATIONS. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/778
Chicago Manual of Style (16th Edition):
Xu, Yaoyao. “MODELING OF STRAIN EFFECT ON THERMAL AND ELECTRICAL TRANSPORT PROPERTIES OF SI/GE NANOCOMPOSITES AND ITS APPLICATIONS.” 2011. Doctoral Dissertation, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_dissertations/778.
MLA Handbook (7th Edition):
Xu, Yaoyao. “MODELING OF STRAIN EFFECT ON THERMAL AND ELECTRICAL TRANSPORT PROPERTIES OF SI/GE NANOCOMPOSITES AND ITS APPLICATIONS.” 2011. Web. 24 Jan 2021.
Vancouver:
Xu Y. MODELING OF STRAIN EFFECT ON THERMAL AND ELECTRICAL TRANSPORT PROPERTIES OF SI/GE NANOCOMPOSITES AND ITS APPLICATIONS. [Internet] [Doctoral dissertation]. Clemson University; 2011. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_dissertations/778.
Council of Science Editors:
Xu Y. MODELING OF STRAIN EFFECT ON THERMAL AND ELECTRICAL TRANSPORT PROPERTIES OF SI/GE NANOCOMPOSITES AND ITS APPLICATIONS. [Doctoral Dissertation]. Clemson University; 2011. Available from: https://tigerprints.clemson.edu/all_dissertations/778
Clemson University
28.
Wang, Wenshan.
Network Target Coordination for Design Optimization of Decomposed Systems.
Degree: PhD, Mechanical Engineering, 2012, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/1071
► A complex engineered system is often decomposed into a number of different subsystems that interact on one another and together produce results not obtainable by…
(more)
▼ A complex engineered system is often decomposed into a number of different subsystems that interact on one another and together produce results not obtainable by the subsystems alone. Effective coordination of the interdependencies shared among these subsystems is critical to fulfill the stakeholder expectations and technical requirements of the original system. The past research has shown that various coordination methods obtain different solution accuracies and exhibit different computational efficiencies when solving a decomposed system. Addressing these coordination decisions may lead to improved complex system design. This dissertation studies coordination methods through two types of decomposition structures, hierarchical, and nonhierarchical. For coordinating hierarchically decomposed systems, linear and proximal cutting plane methods are applied based on augmented Lagrangian relaxation and analytical target cascading (ATC). Three nonconvex, nonlinear design problems are used to verify the numerical performance of the proposed coordination method and the obtained results are compared to traditional update schemes of subgradient-based algorithm. The results suggest that the cutting plane methods can significantly improve the solution accuracy and computational efficiency of the hierarchically decomposed systems. In addition, a biobjective optimization method is also used to capture optimality and feasibility. The numerical performance of the biobjective algorithm is verified by solving an analytical mass allocation problem. For coordinating nonhierarchically decomposed complex systems, network target coordination (NTC) is developed by modeling the distributed subsystems as different agents in a network. To realize parallel computing of the subsystems, NTC via a consensus alternating direction method of multipliers is applied to eliminate the use of the master problem, which is required by most distributed coordination methods. In NTC, the consensus is computed using a locally update scheme, providing the potential to realize an asynchronous solution process. The numerical performance of NTC is verified using a geometrical programming problem and two engineering problems.
Advisors/Committee Members: Fadel, Georges M, Li , Gang, Thompson , Lonny L, Wiecek , Margaret M.
Subjects/Keywords: Alternating Direction Method of Multipliers; Analytical Target Cascading; Consensus Optimization; Cutting Plane Methods; Multidisciplinary Design Optimization; Network Target Cascading; Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Wang, W. (2012). Network Target Coordination for Design Optimization of Decomposed Systems. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/1071
Chicago Manual of Style (16th Edition):
Wang, Wenshan. “Network Target Coordination for Design Optimization of Decomposed Systems.” 2012. Doctoral Dissertation, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_dissertations/1071.
MLA Handbook (7th Edition):
Wang, Wenshan. “Network Target Coordination for Design Optimization of Decomposed Systems.” 2012. Web. 24 Jan 2021.
Vancouver:
Wang W. Network Target Coordination for Design Optimization of Decomposed Systems. [Internet] [Doctoral dissertation]. Clemson University; 2012. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_dissertations/1071.
Council of Science Editors:
Wang W. Network Target Coordination for Design Optimization of Decomposed Systems. [Doctoral Dissertation]. Clemson University; 2012. Available from: https://tigerprints.clemson.edu/all_dissertations/1071
Clemson University
29.
Yin, Jun.
FABRICATION OF GROOVED HOLLOW FIBER MEMBRANE FOR NERVE REGENERATION: PROCESS MODELING AND PERFORMANCE EVALUATION.
Degree: PhD, Mechanical Engineering, 2011, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/847
► Nerve injury is a general but intractable disease in traumatic injuries, leading to a significant reduction of functions in the nervous system. Extensive efforts are…
(more)
▼ Nerve injury is a general but intractable disease in traumatic injuries, leading to a significant reduction of functions in the nervous system. Extensive efforts are made on nerve injury rehabilitation. Since the appropriate connections between neurons and their targets are necessary, guiding axonal outgrowth is an essential step for neuron outgrowth in nervous system development, functioning, and regeneration. Besides the direct surgical nerve connection, an artificial means of guiding nerve regeneration called nerve conduits is widely applied in nerve injury rehabilitation. The main function of nerve conduits is to bridge the nerve gap, to help regenerating axons across damaged regions and guide them to appropriate targets. Recently, polymeric hollow fiber membranes (HFMs) have been studied as a potential nerve conduit for nerve regeneration and repair. In order to further improve the efficiency of HFMs, micropatterns such as aligned grooves are usually introduced on the inner surface of HFMs as an effective topographical guidance cue. The goal of this study is to fabricate HFMs with aligned grooves on the inner surface and understand their effect on nerve regeneration and repair. Consequently, there is a need, first, to carefully design the fabrication process of HFMs introducing aligned grooves on inner surface and understand the groove formation mechanism; second, to better understand the role of defined grooves on the inner surface of HFMs as topographical guidance cues promoting axonal outgrowth. The grooved HFMs were fabricated by means of a phase inversion-based spinning technique with a smooth and annular spinneret by carefully controlling the fabrication conditions. The effects of different operating conditions were experimentally studied, and the fabricated HFMs were also characterized. In order to explain the formation of grooves on the HFM inner surface, two different instability mechanisms were introduced: a hydrodynamic or Marangoni instability and an elastic or buckling instability. The results obtained between the experimental and the theoretical studies were compared in terms of the number of grooves under different operating conditions. Then, the fabricated HFMs with textured inner surface were used as nerve conduits. The effect of the geometry of the grooved inner surface on the axonal outgrowth was studied. A numerical model describing the motion and deformation of an axon moving on the grooved HMF inner surface was developed to study the effect of substrate geometry on axonal outgrowth. This work developed the first theoretical model for the groove formation mechanism during the HFM fabrication. In this model, the Marangoni instability was first used to investigate the onset of instability in the HFM fabrication, and the buckling of instability magnification was also studied. This work also presented the numerical simulation of axonal outgrowth on a three-dimensional substrate, where the influence of the substrate geometry was taken into account. The work…
Advisors/Committee Members: Huang, Yong, Huang , Yong, Coutris , Nicole, Brown , Philip J., Li , Gang, Miller , Richard.
Subjects/Keywords: Axonal outgrowth; Guidance cue; Hollow fiber membrane; Instability; Nerve conduit; Nerve regeneration; Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Yin, J. (2011). FABRICATION OF GROOVED HOLLOW FIBER MEMBRANE FOR NERVE REGENERATION: PROCESS MODELING AND PERFORMANCE EVALUATION. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/847
Chicago Manual of Style (16th Edition):
Yin, Jun. “FABRICATION OF GROOVED HOLLOW FIBER MEMBRANE FOR NERVE REGENERATION: PROCESS MODELING AND PERFORMANCE EVALUATION.” 2011. Doctoral Dissertation, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_dissertations/847.
MLA Handbook (7th Edition):
Yin, Jun. “FABRICATION OF GROOVED HOLLOW FIBER MEMBRANE FOR NERVE REGENERATION: PROCESS MODELING AND PERFORMANCE EVALUATION.” 2011. Web. 24 Jan 2021.
Vancouver:
Yin J. FABRICATION OF GROOVED HOLLOW FIBER MEMBRANE FOR NERVE REGENERATION: PROCESS MODELING AND PERFORMANCE EVALUATION. [Internet] [Doctoral dissertation]. Clemson University; 2011. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_dissertations/847.
Council of Science Editors:
Yin J. FABRICATION OF GROOVED HOLLOW FIBER MEMBRANE FOR NERVE REGENERATION: PROCESS MODELING AND PERFORMANCE EVALUATION. [Doctoral Dissertation]. Clemson University; 2011. Available from: https://tigerprints.clemson.edu/all_dissertations/847
Clemson University
30.
Reeves, Timothy.
PREDICTION OF DISCRETE ELEMENT PARAMETERS FOR MODELING THE STRENGTH OF SANDY SOILS IN WHEEL/SOIL TRACTION APPLICATIONS.
Degree: PhD, Mechanical Engineering, 2013, Clemson University
URL: https://tigerprints.clemson.edu/all_dissertations/1111
► The problem of wheel performance on deformable soil has been studied for many years, but prior to the rise of computational mechanics, such investigations have…
(more)
▼ The problem of wheel performance on deformable soil has been studied for many years, but prior to the rise of computational mechanics, such investigations have been limited to development of analytical and empirical models, as well as experimental research. Such models have merit but are necessarily highly idealized and are limited in their applications. Today, many computational models have been implemented for a wide variety of wheel/soil applications. For the specific case of sandy (i.e. non-cohesive) soils, in terms of the soil's physics the Discrete Element Method (DEM) provides arguably the most realistic model. In DEM, each element represents a single grain of soil (ideally), or may represent a group of soil particles moving together if necessary. A survey of the literature quickly reveals that DEM is computationally intensive and that a great deal of computational effort is normally spent calibrating the DEM model parameters to the desired characteristics of the soil of interest. The goal of this research was to develop and validate an approach to calibration that would require fewer resources, leaving more resources available for solving the problems of interest. This goal was realized through the collection of data over a range of values for each of five simulation parameters using two-dimensional simulations of the Direct Shear Test. By statistical processes the data was used to develop a set of equations that estimate the properties of interest for the simulated soil (small- and large-strain friction angles), based on the simulation parameters. The equations were used to calibrate a two-dimensional rigid wheel/soil simulation of the Wheel Endurance and Sand Traction Merry-Go-Round System (WEST-MGRS). The calibrated model was found to accurately predict the relative performance between a variety of configurations of grousers on actual wheels operating in sand using WEST-MGRS. Therefore, this research shows that the model can be used as a tool to compare the tractive performance of potential designs. A question that must be answered regarding experiments and simulations of the wheel/soil problem is the question of soil dimensions. Whether simulated or experimental, the system must use a soil container large enough to approximate a semi-infinite soil domain. This research expanded on previous work that had proposed a method for sizing soil dimensions in a dynamic 3-D finite element model. With minor modifications, the method was found to be effective for a wide range of wheel loads and geometries, as well as soil types.
Advisors/Committee Members: Biggers, Sherrill B., Joseph , Paul F., Summers , Joshua D., Li , Gang, Ravichandran , Nadarajah.
Subjects/Keywords: Calibration; DEM; Discrete Element; Sandy Soil; Soil Size; Traction; Mechanical Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Reeves, T. (2013). PREDICTION OF DISCRETE ELEMENT PARAMETERS FOR MODELING THE STRENGTH OF SANDY SOILS IN WHEEL/SOIL TRACTION APPLICATIONS. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/1111
Chicago Manual of Style (16th Edition):
Reeves, Timothy. “PREDICTION OF DISCRETE ELEMENT PARAMETERS FOR MODELING THE STRENGTH OF SANDY SOILS IN WHEEL/SOIL TRACTION APPLICATIONS.” 2013. Doctoral Dissertation, Clemson University. Accessed January 24, 2021.
https://tigerprints.clemson.edu/all_dissertations/1111.
MLA Handbook (7th Edition):
Reeves, Timothy. “PREDICTION OF DISCRETE ELEMENT PARAMETERS FOR MODELING THE STRENGTH OF SANDY SOILS IN WHEEL/SOIL TRACTION APPLICATIONS.” 2013. Web. 24 Jan 2021.
Vancouver:
Reeves T. PREDICTION OF DISCRETE ELEMENT PARAMETERS FOR MODELING THE STRENGTH OF SANDY SOILS IN WHEEL/SOIL TRACTION APPLICATIONS. [Internet] [Doctoral dissertation]. Clemson University; 2013. [cited 2021 Jan 24].
Available from: https://tigerprints.clemson.edu/all_dissertations/1111.
Council of Science Editors:
Reeves T. PREDICTION OF DISCRETE ELEMENT PARAMETERS FOR MODELING THE STRENGTH OF SANDY SOILS IN WHEEL/SOIL TRACTION APPLICATIONS. [Doctoral Dissertation]. Clemson University; 2013. Available from: https://tigerprints.clemson.edu/all_dissertations/1111
◁ [1] [2] ▶
. 
Open Access Theses and Dissertations