+publisher:"University of Illinois – Chicago" +contributor:("Foster, Craig")

University of Illinois – Chicago

1. Gongal, Dipika. Multi-Scale Modeling of Human Cornea.

Degree: 2012, University of Illinois – Chicago

► The cornea’s biomechanical properties greatly influence shape and the visual performance of eye. Keratoconus, a degenerative disease, is caused by loss of biomechanical strength of… (more)

Subjects/Keywords: cornea biomechanics; collagen fibrils; crosslinking; finite element analysis

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APA (6^th Edition):

Gongal, D. (2012). Multi-Scale Modeling of Human Cornea. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/9275

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gongal, Dipika. “Multi-Scale Modeling of Human Cornea.” 2012. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/9275.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gongal, Dipika. “Multi-Scale Modeling of Human Cornea.” 2012. Web. 21 Jan 2021.

Vancouver:

Gongal D. Multi-Scale Modeling of Human Cornea. [Internet] [Thesis]. University of Illinois – Chicago; 2012. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/9275.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gongal D. Multi-Scale Modeling of Human Cornea. [Thesis]. University of Illinois – Chicago; 2012. Available from: http://hdl.handle.net/10027/9275

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

2. Masurekar, Sarvesh S. 3D FEM & Multibody System Coupling of Railroad Dynamics with Vibration of Surrounding Building Structure.

Degree: 2018, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/22661

► Rail transportation of both passengers and goods plays a vital and evolving role in US society and worldwide. Particularly with the introduction of higher-speed rail… (more)

Subjects/Keywords: FINITE ELEMENT ANALYSIS; MODAL ANALYSIS; MULTIBODY DYNAMICS; NODAL ELIMINATION; FLOATING FRAME OF REFERENCE.

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APA (6^th Edition):

Masurekar, S. S. (2018). 3D FEM & Multibody System Coupling of Railroad Dynamics with Vibration of Surrounding Building Structure. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/22661

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Masurekar, Sarvesh S. “3D FEM & Multibody System Coupling of Railroad Dynamics with Vibration of Surrounding Building Structure.” 2018. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/22661.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Masurekar, Sarvesh S. “3D FEM & Multibody System Coupling of Railroad Dynamics with Vibration of Surrounding Building Structure.” 2018. Web. 21 Jan 2021.

Vancouver:

Masurekar SS. 3D FEM & Multibody System Coupling of Railroad Dynamics with Vibration of Surrounding Building Structure. [Internet] [Thesis]. University of Illinois – Chicago; 2018. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/22661.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Masurekar SS. 3D FEM & Multibody System Coupling of Railroad Dynamics with Vibration of Surrounding Building Structure. [Thesis]. University of Illinois – Chicago; 2018. Available from: http://hdl.handle.net/10027/22661

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

3. El-Ghandour, Ahmed I. A Full 3D Railroad System Model to Investigate Train-Substructure Interaction Under Dynamic Load.

Degree: 2017, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/21726

► Since the first day the railroad have been invented, it has become one of the most important methods of transportation for both passengers and goods.… (more)

▼ Since the first day the railroad have been invented, it has become one of the most important methods of transportation for both passengers and goods. Millions of miles of railroads tracks are crossing the land all over the world to facilitate the transportation of passengers and different products. The importance of the railroad raised the interest of many researchers and engineers to try to understand and improve the performance of the rails. The finite element method (FEM) has been used widely, as a very powerful numerical method, in the literature to model and investigate the performance of the different components of the railroad system. A lot of scientists used the FEM to study different issues associated with the railroad system, such as stresses in the wheel or the rail web, degradation of the ballast, soil settlement, and many other problems. Beside the FEM, the multi-body systems dynamics (MBS) have been used by many researchers as well as the FEM in the same field. It is very useful tool especially when it comes to the dynamic analysis and investigating the vehicle performance or issues related to the wheel/rail contact. In this work, a detailed model that couples both FEM and MBS in one model is created. This model consists of a full 3D FE model that includes the different components of the railroad system (rails, sleepers, ballast, subballast, subgrade, and fasteners) using beam, solid and spring elements. The FE model is then coupled with the MBS code to extract the output of the dynamic analysis. The model was verified with the results in the literature and showed great performance. The good results of the coupled model provided a strong motivation to move forward with another problem, which is the bridge approach problem in this work. A new coupled model was created to investigate the bridge approach problem that arises from the variation of the stiffness below the rail due to the stiff foundation on the bridge and the softer substructure before and after the bridge. To solve the stiffness variation problem, a concrete slab was implemented under the ballast before the bridge with one end resting on the abutment. Two designs of the slab were studied in this work, namely rectangular and inclined slab. The performance of both slabs was compared with the no slab case, and the results showed great improvement in the vertical displacement, the contact force, and the substructure stresses for both slabs, while the inclined slab showed better performance than the rectangular one as it provides a gradual change in the stiffness in the approach zone. The results of this work show the effectiveness of the presented coupling technique between the FEM and MBS in one model and the usefulness of the presented models. The bridge model analysis showed the effectiveness of the inclined slab as a recommended solution for the approach zone problem and its impact on the reduction of the vertical displacement, the contact forces, and the stresses. Advisors/Committee Members: Foster, Craig (advisor), Ozevin, Didem (committee member), Karpov, Eduard (committee member), Issa, Mohsen (committee member), Royston, Thomas (committee member), Foster, Craig (chair).

Subjects/Keywords: Railroad; FEA; MBS; Substructure; Dynamics; Modal analysis; ANSYS.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

El-Ghandour, A. I. (2017). A Full 3D Railroad System Model to Investigate Train-Substructure Interaction Under Dynamic Load. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/21726

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

El-Ghandour, Ahmed I. “A Full 3D Railroad System Model to Investigate Train-Substructure Interaction Under Dynamic Load.” 2017. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/21726.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

El-Ghandour, Ahmed I. “A Full 3D Railroad System Model to Investigate Train-Substructure Interaction Under Dynamic Load.” 2017. Web. 21 Jan 2021.

Vancouver:

El-Ghandour AI. A Full 3D Railroad System Model to Investigate Train-Substructure Interaction Under Dynamic Load. [Internet] [Thesis]. University of Illinois – Chicago; 2017. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/21726.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

El-Ghandour AI. A Full 3D Railroad System Model to Investigate Train-Substructure Interaction Under Dynamic Load. [Thesis]. University of Illinois – Chicago; 2017. Available from: http://hdl.handle.net/10027/21726

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

4. Alsharif, Fadi. Structural Behavior of Lightweight Concrete Bridge Deck Slabs Reinforced with Basalt FRP Bars.

Degree: 2014, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/19046

► The implementation of Basalt Fiber Reinforced Polymers (BFRP) in bridge decks supported on girders, where deflection is not an issue, has the potential to offer… (more)

▼ The implementation of Basalt Fiber Reinforced Polymers (BFRP) in bridge decks supported on girders, where deflection is not an issue, has the potential to offer an efficient solution that is corrosion resistant, durable and cost effective. In this paper, the structural behavior of Lightweight Concrete (LWC) bridge decks, reinforced with BFRP reinforcing bars, was studied. The research program included experimental testing of eight LWC bridge deck specimens reinforced with BFRP reinforcing bars. The cross section of the specimens was 18 x 8 in. with a length to height ratio (L/H) equal to 9, 10, 12 and 13. The purpose of testing program was to study the structural behavior of bridge decks supported on girders, in addition to the pre-cracking and post-cracking behavior till the failure of the specimens. Two of the specimens were simply supported with a span length of 6.67 ft. and (L/H) equal to 10; and were reinforced with 5 BFRP bars of diameter 0.625 in. and 5 bars of diameter 0.5 in. at the bottom, respectively. The ratio of the bottom to the balanced reinforcement areas (ρ_f⁄(ρ_fb)) were 4.1 and 2.6, respectively. Two additional specimens were continuously supported with two spans of 8.67 ft. each, (L/H) ratio of 13, and were tested for positive and negative moment capacities. They were reinforced with 5 BFRP bars of diameter 0.625 in. and 5 BFRP bars of diameter 0.5 in. at the bottom with (ρ_f⁄(ρ_fb) )equal to 4.1 and 2.6, respectively. The specimens were reinforced at the top with 6 bars of 0.625 in. diameter and 6 bars of 0.5 in. diameter with (ρ_f⁄(ρ_fb) )equal to 5.1 and 3.2, respectively. The other specimens were simply supported reinforced as the two continuous decks, with a varying span of 6 and 8 ft., and (L/H) equal to 9 and 12 respectively. The nominal moment capacities (Mn) were accurately predicted by the specifications of the ACI 440.1R (2006), however the ultimate moment capacities (Mn) were conservative due to a lower strength reduction factor (ϕ). The deflections of the reinforced slabs were high due to the relatively lower modulus of elasticity of BFRP bars. Advisors/Committee Members: Issa, Mohsen (advisor), Reddy, Krishna (committee member), Foster, Craig (committee member).

Subjects/Keywords: FRP; BFRP; Lightweight Concrete; Bridge Deck

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Alsharif, F. (2014). Structural Behavior of Lightweight Concrete Bridge Deck Slabs Reinforced with Basalt FRP Bars. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/19046

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Alsharif, Fadi. “Structural Behavior of Lightweight Concrete Bridge Deck Slabs Reinforced with Basalt FRP Bars.” 2014. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/19046.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Alsharif, Fadi. “Structural Behavior of Lightweight Concrete Bridge Deck Slabs Reinforced with Basalt FRP Bars.” 2014. Web. 21 Jan 2021.

Vancouver:

Alsharif F. Structural Behavior of Lightweight Concrete Bridge Deck Slabs Reinforced with Basalt FRP Bars. [Internet] [Thesis]. University of Illinois – Chicago; 2014. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/19046.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Alsharif F. Structural Behavior of Lightweight Concrete Bridge Deck Slabs Reinforced with Basalt FRP Bars. [Thesis]. University of Illinois – Chicago; 2014. Available from: http://hdl.handle.net/10027/19046

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

5. Sparks, Gregory. Microstructural Characterization of Magnetic Regions in a Cast Austenitic Heat Resistant Steel.

Degree: 2015, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/19365

► The development of magnetic regions in an initially non-magnetic cast austenitic heat-resistant steel has been examined. Samples were extracted from different regions in a failed… (more)

Subjects/Keywords: Carbides; Carbonitrides; Magnetic Etching; High Temperature; Steam Reforming; Cast Austenitic Steel; Chromium Depletion; Microstructure

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APA (6^th Edition):

Sparks, G. (2015). Microstructural Characterization of Magnetic Regions in a Cast Austenitic Heat Resistant Steel. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/19365

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sparks, Gregory. “Microstructural Characterization of Magnetic Regions in a Cast Austenitic Heat Resistant Steel.” 2015. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/19365.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sparks, Gregory. “Microstructural Characterization of Magnetic Regions in a Cast Austenitic Heat Resistant Steel.” 2015. Web. 21 Jan 2021.

Vancouver:

Sparks G. Microstructural Characterization of Magnetic Regions in a Cast Austenitic Heat Resistant Steel. [Internet] [Thesis]. University of Illinois – Chicago; 2015. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/19365.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sparks G. Microstructural Characterization of Magnetic Regions in a Cast Austenitic Heat Resistant Steel. [Thesis]. University of Illinois – Chicago; 2015. Available from: http://hdl.handle.net/10027/19365

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

6. Ariyan, Mansoore. Mechanokinetic coupled Modeling of Self-Healing Behavior in Materials.

Degree: 2014, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/11210

► Many inspiration in biological science world strike exciting opportunities in material science and led to a range of biomimetic and other advanced functional materials for… (more)

▼ Many inspiration in biological science world strike exciting opportunities in material science and led to a range of biomimetic and other advanced functional materials for engineering and medical applications. The self-controlled smart behavior of these systems make their individual functional components sense and process the environment and take necessary actions, similar to a living creature. This smart action is referred to a progressive change of material internal structure and chemical composition at a macroscopic interval of time. The dynamic internal structure results in varying constitutive properties and viewed as an adequate response of the material to external loading. The slow-rate evolution of constitutive properties of the materials is often affected by non-elastomechanical nature, such as phase transitions, chemical reactions, diffusion and other kinetic processes at the atomic scale. Additionally, the interplay between the mechanical performance and the internal structure dynamics can be two-way. This indicates that mechanical stress or strain in such material may trigger or affect kinetic processes responsible for its internal structure evolution; in turn, the changed internal structure may influence bulk properties and therefore mechanical response of the material to the external loading. In this study, a nondeterministic multiple scale approach based on numerical solution of the Monte-Carlo master equation on atomic lattices solved together with a standard vi Finite-Element formulation of solid mechanics is investigated. This approach is applicable to long-term evolutionary processes such as precipitation, volume diffusion and creep cavity self-healing in nano-crystalline austenite (Fe fcc) samples. A two-way mechanokinetic coupling is achieved through implementation of strain- dependent diffusion rates and dynamic update of the finite element model based on atomic structure evolution. This study also discusses the effect of macroscopic static loading and cavity geometry on the total healing time. The approach is used in application of modeling and characterization of advanced functional materials with evolutionary internal structures, and emerging behavior in material systems. In the current research we are studying a nondeterministic multiple scale approach based on numerical solution of the Monte-Carlo master equation on atomic lattices which is solved together with a standard Finite-Element formulation of solid mechanics. This approach is applicable to long-term evolutionary processes such as precipitation, volume diffusion and creep cavity self-healing in nanocrystalline austenite (Fe fcc) samples. A two-way mechanokinetic coupling is achieved through implementation of strain-dependent diffusion rates and dynamic update of the finite element model based on atomi structure evolution. This study also discusses the effect of macroscopic static loading and cavity geometry on the total healing time. The approach is used in application of modeling and characterization of advanced functional… Advisors/Committee Members: Karpov, Eduard (advisor), McNallan, Michael (committee member), Foster, Craig (committee member).

Subjects/Keywords: Self-healing materials; Monte Carlo; Finite Elements

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ariyan, M. (2014). Mechanokinetic coupled Modeling of Self-Healing Behavior in Materials. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/11210

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ariyan, Mansoore. “Mechanokinetic coupled Modeling of Self-Healing Behavior in Materials.” 2014. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/11210.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ariyan, Mansoore. “Mechanokinetic coupled Modeling of Self-Healing Behavior in Materials.” 2014. Web. 21 Jan 2021.

Vancouver:

Ariyan M. Mechanokinetic coupled Modeling of Self-Healing Behavior in Materials. [Internet] [Thesis]. University of Illinois – Chicago; 2014. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/11210.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ariyan M. Mechanokinetic coupled Modeling of Self-Healing Behavior in Materials. [Thesis]. University of Illinois – Chicago; 2014. Available from: http://hdl.handle.net/10027/11210

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

7. Chen, Michelle L. Metamaterial Behavior and Dissipative Structures in Bistable Mechanical Systems.

Degree: 2014, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/19105

► Bistable active media in a thermodynamically open dynamic system can lead to anomalous phenomena by providing an extra equilibrium stable state and the means to… (more)

Subjects/Keywords: Bistability; elastic metamaterial; open system; autowave; dissipative structure; nonequilibrium phase diagram; barium titanate

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chen, M. L. (2014). Metamaterial Behavior and Dissipative Structures in Bistable Mechanical Systems. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/19105

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chen, Michelle L. “Metamaterial Behavior and Dissipative Structures in Bistable Mechanical Systems.” 2014. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/19105.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chen, Michelle L. “Metamaterial Behavior and Dissipative Structures in Bistable Mechanical Systems.” 2014. Web. 21 Jan 2021.

Vancouver:

Chen ML. Metamaterial Behavior and Dissipative Structures in Bistable Mechanical Systems. [Internet] [Thesis]. University of Illinois – Chicago; 2014. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/19105.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chen ML. Metamaterial Behavior and Dissipative Structures in Bistable Mechanical Systems. [Thesis]. University of Illinois – Chicago; 2014. Available from: http://hdl.handle.net/10027/19105

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

8. Hamper, Martin B. Multibody System Investigation of Contact Geometry: Application to Deformable and Variable Profile Rails.

Degree: 2014, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/19096

► Modeling the contact problem is a fundamental feature in a variety of multibody system dynamics applications and is of particular importance in the area of… (more)

▼ Modeling the contact problem is a fundamental feature in a variety of multibody system dynamics applications and is of particular importance in the area of railroad vehicle dynamics. An accurate model of the wheel and rail is required in order to develop high fidelity models of vehicle/track interaction scenarios. This may be accomplished through including the dynamic effects of track flexibility and through refinement of the contact surface geometry model. This thesis will present an alternative approach for modeling both of these applications. The first method introduced is an adaption of the finite segment approach to modeling rail flexibility as an alternative to conventional finite element methods. The finite segment approach differs from the finite element approach by concentrating a body's elasticity and inertia between rigid elements rather than distributing them throughout each elastic element. It is first shown that the finite segment method may be integrated with existing rail geometry representation techniques. It is then shown through a comparative numerical analysis that the finite segment method provides reasonable accuracy in the prediction of the deformation of the rail. It is also shown that this method results in fictitious spikes in the contact forces which are not eliminated via model refinement. The second method introduced is an adaption of absolute nodal coordinate formulation (ANCF) thin plate element geometry to modeling contact surfaces. It is shown that existing methods for modeling variable profile contact geometry do not satisfy the continuity requirements of the contact approach employed in this thesis. The most common procedure is direct linear interpolation between profile curves. The low order continuity of this method results in erroneous spikes in the predicted contact forces. A new ANCF thin plate element is introduced after demonstrating that existing ANCF elements do not satisfy the continuity requirements. A railroad vehicle example including variable profile rail is commented on. Here, a comparative numerical analysis shows that the new ANCF thin plate surface model eliminates the erroneous spikes in the predicted contact forces at the cost of a small increases in the computational time required for the simulation. Advisors/Committee Members: Shabana, Ahmed A. (advisor), Recuero, Antonio M. (committee member), Fallahi, Behrooz (committee member), Foster, Craig D. (committee member), Royston, Thomas J. (committee member).

Subjects/Keywords: Multibody; Dynamics; Contact; Railroad; Flexible; Dynamic Simulation; Vehicle/Track Interaction; ANCF; Absolute Nodal Coordinate Formulation; Thin Plate; Finite Segment

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hamper, M. B. (2014). Multibody System Investigation of Contact Geometry: Application to Deformable and Variable Profile Rails. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/19096

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hamper, Martin B. “Multibody System Investigation of Contact Geometry: Application to Deformable and Variable Profile Rails.” 2014. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/19096.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hamper, Martin B. “Multibody System Investigation of Contact Geometry: Application to Deformable and Variable Profile Rails.” 2014. Web. 21 Jan 2021.

Vancouver:

Hamper MB. Multibody System Investigation of Contact Geometry: Application to Deformable and Variable Profile Rails. [Internet] [Thesis]. University of Illinois – Chicago; 2014. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/19096.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hamper MB. Multibody System Investigation of Contact Geometry: Application to Deformable and Variable Profile Rails. [Thesis]. University of Illinois – Chicago; 2014. Available from: http://hdl.handle.net/10027/19096

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

9. Aboubakr, Ahmed K. Use of Non-inertial Coordinates and Implicit Integration for Efficient Solution of Multibody Systems.

Degree: 2015, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/19332

► Development of computational methods, formulations, and algorithms to study interconnected bodies that undergo large deformation, translational, and rotational displacements is the main focus for this… (more)

▼ Development of computational methods, formulations, and algorithms to study interconnected bodies that undergo large deformation, translational, and rotational displacements is the main focus for this thesis. This thesis discusses the use of the concept of non-inertial coordinates and implicit numerical integrations methods to solve stiff MBS differential/algebraic equations. Complex MBS examples that consist of rigid and flexible bodies are used as examples in order to demonstrate the use of these developed algorithms. One of the main contributions of this thesis is to employ the concept of the inertial and non-inertial coordinates to obtain an efficient solution for practical MBS applications. Inertial coordinates have generalized inertia forces associated with them, while the non-inertial coordinates have no generalized inertia forces. In order to avoid having a singular inertia matrix and/or high frequency oscillations, the second derivatives of the non-inertial coordinates are not used when formulating the system equations of motion in this study. In this case, the system coordinates are partitioned into two distinct sets; inertial and non-inertial coordinates. The use of the principle of virtual work leads to a coupled system of differential and algebraic equations expressed in terms of the inertial and non-inertial coordinates. The differential equations are used to determine the inertial accelerations which can be integrated to determine the inertial coordinates and velocities. The non-inertial coordinates are determined by using an iterative algorithm to solve a set of nonlinear algebraic force equations obtained using quasi-static equilibrium conditions. The non-inertial velocities are determined by solving these algebraic force equations at the velocity level. The non-inertial coordinates and velocities enter into the formulation of the generalized forces associated with the inertial coordinates. Using the concept of non-inertial coordinates and the resulting differential/algebraic equations obtained in this thesis leads to significant reduction in the numbers of state equations, system inertial coordinates, and constraint equations; and allows avoiding a system of stiff differential equations that can arise because of the relatively small mass. The development of accurate nonlinear longitudinal train force models is necessary in order to better understand railroad vehicle dynamic scenarios that include braking, traction, and derailments. Car coupler forces have significant effects on the longitudinal train dynamics and stability. Using the concept of non-inertial coordinate developed in this thesis allows developing of a more detailed coupler model that captures the coupler kinematics without significantly increasing the number of state equations and the dimension of the problem. The coupler model proposed in this thesis allows for the car bodies to have arbitrary displacements, also avoids having a stiff system of differential equations that can result from the use of relatively small masses. In order to… Advisors/Committee Members: Shabana, Ahmed (advisor), Royston, Thomas (committee member), Recuero, Antonio (committee member), Foster, Craig (committee member), Fallahi, Behrooz (committee member).

Subjects/Keywords: Non-inertial Coordinates; longitudinal train forces; coupler geometric nonlinearities; railroad vehicle dynamics; multibody systems. TLISMNI implicit numerical integration; multibody system differential /algebraic equations; sparse matrix implementation; Jacobian-free Newton-Krylov, stiff equations.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Aboubakr, A. K. (2015). Use of Non-inertial Coordinates and Implicit Integration for Efficient Solution of Multibody Systems. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/19332

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Aboubakr, Ahmed K. “Use of Non-inertial Coordinates and Implicit Integration for Efficient Solution of Multibody Systems.” 2015. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/19332.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Aboubakr, Ahmed K. “Use of Non-inertial Coordinates and Implicit Integration for Efficient Solution of Multibody Systems.” 2015. Web. 21 Jan 2021.

Vancouver:

Aboubakr AK. Use of Non-inertial Coordinates and Implicit Integration for Efficient Solution of Multibody Systems. [Internet] [Thesis]. University of Illinois – Chicago; 2015. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/19332.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Aboubakr AK. Use of Non-inertial Coordinates and Implicit Integration for Efficient Solution of Multibody Systems. [Thesis]. University of Illinois – Chicago; 2015. Available from: http://hdl.handle.net/10027/19332

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

10. Heidary, Zahra. Numerical Modeling of Wave Propagation at Large Scale Damaged Structures For Quantitative AE.

Degree: 2015, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/19353

► The Acoustic Emission (AE) method is a nondestructive testing method that relies on the waves emitted from the localized permanent deformation. The method can detect,… (more)

Subjects/Keywords: Acoustic Emission; Wave Propagation; Boundary Conditions; Sensor Transfer function

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Heidary, Z. (2015). Numerical Modeling of Wave Propagation at Large Scale Damaged Structures For Quantitative AE. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/19353

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Heidary, Zahra. “Numerical Modeling of Wave Propagation at Large Scale Damaged Structures For Quantitative AE.” 2015. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/19353.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Heidary, Zahra. “Numerical Modeling of Wave Propagation at Large Scale Damaged Structures For Quantitative AE.” 2015. Web. 21 Jan 2021.

Vancouver:

Heidary Z. Numerical Modeling of Wave Propagation at Large Scale Damaged Structures For Quantitative AE. [Internet] [Thesis]. University of Illinois – Chicago; 2015. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/19353.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Heidary Z. Numerical Modeling of Wave Propagation at Large Scale Damaged Structures For Quantitative AE. [Thesis]. University of Illinois – Chicago; 2015. Available from: http://hdl.handle.net/10027/19353

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

11. Chirakkara, Reshma A. Phytoremediation of Soils with Mixed Contamination.

Degree: 2015, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/19382

► Phytoremediation has the potential to be a green and sustainable approach to decontaminate and restore contaminated sites, while maintaining the biological activity and physical structure… (more)

▼ Phytoremediation has the potential to be a green and sustainable approach to decontaminate and restore contaminated sites, while maintaining the biological activity and physical structure of the soils. However, its effectiveness to address the problems of mixed contaminants is not well understood since the interaction of co-contaminants can result in different phytoremediation responses. This study presents a series of laboratory experiments that probe the applicability of phytoremediation to soils co-contaminated with naphthalene, phenanthrene, lead, cadmium, and chromium; five contaminants that are commonly found at industrial sites. The specific research objectives are to investigate which plant species can best survive and remediate these typical mixed industrial contaminants in soils; examine the synergistic effects of mixed contaminants; consider the effect of the initial contaminant levels on the phytoremediation of mixed contaminants in soils; weigh strategies to enhance that phytoremediation process, including the use of biomass, chemical and electrokinetic amendments; and, finally, to study the effects of enhanced phytoremediation on historically contaminated soil that is polluted with mixed contamination. Five plant species (oat plant, sunflower, rye grass, tall fescue, and green gram) were identified as plants that can survive in the typical mixed contaminated soil considered. Although the sunflower produced the least biomass in mixed contaminated soil, it achieved the best heavy metal dissipation. Rye grass, tall fescue, and green gram did not effectively reduce the heavy metal concentrations from the soil. However, they enhanced the microbial degradation of organic contaminants. Cr alone in the soil produced the most phytotoxic soil in which no plants survived to the end of test period. Heavy metal phytoextraction by the plants reduced in presence of organic contaminants. The chemical amendments used in the study increased the phytotoxicity symptoms and reduced phytoextraction efficiency. Biomass growth and phytoextraction efficiency improved with the application of compost as a soil amendment. Experiments on the aged industrial soil confirmed this finding. The study showed that for the mixed contaminated soil considered here, compost amendment in combination with phytoremediation using the sunflower plant is a promising approach for remediation. Advisors/Committee Members: Reddy, Krishna R. (advisor), Foster, Craig D. (committee member), Issa, Mohsen A. (committee member), Khodadoust, Amid P. (committee member), BassiriRad, Hormoz (committee member).

Subjects/Keywords: Phytoremediation; soils; mixed contamination; heavy metals, organic contaminants; enhancement

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chirakkara, R. A. (2015). Phytoremediation of Soils with Mixed Contamination. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/19382

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chirakkara, Reshma A. “Phytoremediation of Soils with Mixed Contamination.” 2015. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/19382.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chirakkara, Reshma A. “Phytoremediation of Soils with Mixed Contamination.” 2015. Web. 21 Jan 2021.

Vancouver:

Chirakkara RA. Phytoremediation of Soils with Mixed Contamination. [Internet] [Thesis]. University of Illinois – Chicago; 2015. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/19382.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chirakkara RA. Phytoremediation of Soils with Mixed Contamination. [Thesis]. University of Illinois – Chicago; 2015. Available from: http://hdl.handle.net/10027/19382

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

12. Giri, Rajiv Kumar. Attaining Landfill Sustainability through Coupled Hydro-Bio-Mechanical Modeling of Municipal Solid Waste.

Degree: 2015, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/19799

► Disposal of municipal solid waste (MSW) in landfills is one of the most commonly adopted options to manage MSW in the United States and many… (more)

▼ Disposal of municipal solid waste (MSW) in landfills is one of the most commonly adopted options to manage MSW in the United States and many other countries worldwide. Bioreactor landfills that involve controlled injection of leachate to increase moisture and distribute nutrients/microbes within the MSW are being practiced as a means for striving towards sustainability in solid waste management. In bioreactor landfill, enhanced moisture levels promote rapid MSW biodegradation, faster MSW compression and the waste stabilization, thus eliminating long term environmental risk to the surrounding environment and public. However, the dynamic coupled hydraulic, biodegradation and mechanical processes in bioreactor landfills significantly affect the MSW compression, slope stability and in-plane shear response (shear stress-displacement) of the composite side slope and base liner and final cover system. This study presented a new mathematical modeling framework based on a rational approach for designing new bioreactor landfills as well as optimizing the performance of existing bioreactor landfills subjected to coupled hydro-bio-mechanical processes. The mathematical modeling framework was developed by integrating and simultaneously solving a mechanical model based on plain-strain formulation of Mohr-Coulomb criterion, a hydraulic two-phase flow model based on 2-D unsaturated Richards’s equation and a biodegradation model formulated using the first-order decay kinetics similar to USEPA’s LandGEM model. The developed framework was validated based on previous laboratory experiment and a field monitoring study. Afterwards, the integrated mathematical framework was employed to evaluate the performance of bioreactor landfills, such as, flow and distribution of moisture, the stability of landfill slopes, the landfill settlement, the changes in geotechnical properties with waste degradation, and the interface shear stress-displacement response of composite side slope and bottom liner and final cover systems. Moreover, a parametric study using the coupled hydro-bio-mechanical framework was performed to assess various system designs and operational conditions, namely: the bioreactor landfill slope configurations, the geometric configuration of trench systems, and the modes (continuous v/s intermittent) of leachate injection. In addition, Monte-Carlo simulations and reliability assessment of performance of bioreactor landfills were carried out by employing the coupled mathematical framework to examine the influence of spatial variability (uncertainties) in major geotechnical properties of MSW (e.g., unit weight, shear strength, anisotropy, saturated hydraulic conductivity, initial saturation, porosity, residual saturation, and unsaturated hydraulic parameters). Overall, this research study provided a new mathematical modeling framework that can account for both spatial and temporal changes in major geotechnical properties of MSW due to the extent of degradation, and successfully predicts the long-term performance (e.g., landfill… Advisors/Committee Members: Reddy, Krishna R. (advisor), Issa, Mohsen (committee member), Foster, Craig (committee member), Khodadoust, Amid (committee member), Ai, Ning (committee member).

Subjects/Keywords: Coupled Hydro-bio-mechanical process; leachate recirculation; liner system; slope stability; Municipal solid waste landfills

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Giri, R. K. (2015). Attaining Landfill Sustainability through Coupled Hydro-Bio-Mechanical Modeling of Municipal Solid Waste. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/19799

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Giri, Rajiv Kumar. “Attaining Landfill Sustainability through Coupled Hydro-Bio-Mechanical Modeling of Municipal Solid Waste.” 2015. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/19799.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Giri, Rajiv Kumar. “Attaining Landfill Sustainability through Coupled Hydro-Bio-Mechanical Modeling of Municipal Solid Waste.” 2015. Web. 21 Jan 2021.

Vancouver:

Giri RK. Attaining Landfill Sustainability through Coupled Hydro-Bio-Mechanical Modeling of Municipal Solid Waste. [Internet] [Thesis]. University of Illinois – Chicago; 2015. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/19799.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Giri RK. Attaining Landfill Sustainability through Coupled Hydro-Bio-Mechanical Modeling of Municipal Solid Waste. [Thesis]. University of Illinois – Chicago; 2015. Available from: http://hdl.handle.net/10027/19799

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

13. Tennant, Adam G. Behavior of Cement-Stabilized Soil Block Masonry Under Flexure.

Degree: 2016, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/20848

► A study of cement-stabilized soil block (CSSB) masonry under flexure was carried out using an experimental, practical, and a theoretical approach. Initially, some field work… (more)

▼ A study of cement-stabilized soil block (CSSB) masonry under flexure was carried out using an experimental, practical, and a theoretical approach. Initially, some field work was conducted, monitoring block production and use in Bangalore India. Quality control parameters were also observed such as maintaining standards of clay content, block density, and curing. The first laboratory experimental work conducted was to obtain the basic geotechnical material properties of the raw material used in producing both the blocks and the mortar. A second set of experiments were performed to ascertain the material properties of the components that make up masonry. For example, compressive strength and Young's modulus were determined for both the block and mortar to be used in making various assemblages. A variety of other parameters of the block and mortar were recorded to be later used in finite element modeling (FEM). The third and final set of experiments was performed in the form of five-block prisms and one-meter tall wallettes. The five block prisms were used for testing compressive strength, modulus of elasticity of the masonry, and the flexural bond strength. The experimental portion culminated in the wall panels tested in flexure. A practical application on the experimental data is to see if traditional masonry design codes could be used when constructing out of CSSB units. Since the structural design codes of traditional masonry buildings have been well developed over the past century, many of the same principles may be applicable to CSSB masonry buildings. Though the above research answered critical questions, uncertainty remains on how this material will perform globally. Exploring the detailed mechanical and structural behavior through a finite element model developed specifically for masonry with material parameters for CSSB is also finally explored in this research work. Advisors/Committee Members: Foster, Craig (advisor), Issa, Mohsen (committee member), Karpov, Eduard (committee member), Wu, Chien H. (committee member), Reddy, Venkatarama (committee member).

Subjects/Keywords: Masonry; Flexure; Earthen Construction; Cement-Stabilized Soil Block; Finite element analysis

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tennant, A. G. (2016). Behavior of Cement-Stabilized Soil Block Masonry Under Flexure. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/20848

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Tennant, Adam G. “Behavior of Cement-Stabilized Soil Block Masonry Under Flexure.” 2016. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/20848.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Tennant, Adam G. “Behavior of Cement-Stabilized Soil Block Masonry Under Flexure.” 2016. Web. 21 Jan 2021.

Vancouver:

Tennant AG. Behavior of Cement-Stabilized Soil Block Masonry Under Flexure. [Internet] [Thesis]. University of Illinois – Chicago; 2016. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/20848.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tennant AG. Behavior of Cement-Stabilized Soil Block Masonry Under Flexure. [Thesis]. University of Illinois – Chicago; 2016. Available from: http://hdl.handle.net/10027/20848

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

14. Meng, Dewei. Investigations in Crack Detection and Monitoring Based on PPP-BOTDA Distributed Sensing Technology.

Degree: 2016, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/20900

► Cracking is a common phenomenon in the structural members experiencing aging and deterioration problems. Structural health monitoring (SHM) based on crack detection and monitoring plays… (more)

▼ Cracking is a common phenomenon in the structural members experiencing aging and deterioration problems. Structural health monitoring (SHM) based on crack detection and monitoring plays an important role in safety evaluation of the structures. Sensors developed from different technologies have been employed in crack detection and monitoring. Compared to point-style sensors, fiber optic distributed sensors have the advantage of performing ubiquitous sensing, which can locate the cracks directly. Brillouin scattering in optical fibers is sensitive to strain/temperature variations. One key factor affecting the performance of a Brillouin distributed sensing system is the spatial resolution (SR). Pre-pump-pulse Brillouin optical time domain analysis (PPP-BOTDA) is developed and capable of distributed strain/temperature sensing with centimeter-level SR. In this research, the capability of PPP-BOTDA in crack detection and monitoring is studied both theoretically and experimentally. Appearance of a crack in the structural member will create an extra strain distribution in the sensing fiber. The changes in Brillouin gain spectrum (BGS) induced by the extra strain are analyzed by numerical simulation and validated by the single-crack test. The changes in BGS are characterized by Brillouin frequency shift (BFS) and the difference in BGS width (BGSWD). Overall, results from the test match with calculation from numerical simulation. The crack is successfully detected as a peak from BFS and BGSWD. The widening of the crack can be monitored by the amplitude of the peak. Tests on structural members show that the SR employed will affect the performance of the sensing system when multi cracks appear. The capability of PPP-BOTDA system in differentiating neighboring cracks is studied through numerical simulation followed by experimental tests for a series of dual-crack cases considering different crack spacings. It is concluded that PPP-BOTDA can differentiate neighboring cracks when the SR employed is superior to the crack spacing. The conclusion from the dual-crack cases is validated by results from load tests of reinforced concrete (RC) beams. Based on the comprehensive research, better understanding of the results from the tests is achieved, and general guidance is provided for crack detection and monitoring with PPP-BOTDA distributed sensors. Advisors/Committee Members: Ansari, Farhad (advisor), Stroscio, Michael (committee member), Karpov, Eduard (committee member), Foster, Craig (committee member), Ozevin, Didem (committee member).

Subjects/Keywords: crack detection and monitoring; distributed sensing; PPP-BOTDA; numerical simulation; experimental test; BGS; BFS; BGSWD.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Meng, D. (2016). Investigations in Crack Detection and Monitoring Based on PPP-BOTDA Distributed Sensing Technology. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/20900

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Meng, Dewei. “Investigations in Crack Detection and Monitoring Based on PPP-BOTDA Distributed Sensing Technology.” 2016. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/20900.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Meng, Dewei. “Investigations in Crack Detection and Monitoring Based on PPP-BOTDA Distributed Sensing Technology.” 2016. Web. 21 Jan 2021.

Vancouver:

Meng D. Investigations in Crack Detection and Monitoring Based on PPP-BOTDA Distributed Sensing Technology. [Internet] [Thesis]. University of Illinois – Chicago; 2016. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/20900.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Meng D. Investigations in Crack Detection and Monitoring Based on PPP-BOTDA Distributed Sensing Technology. [Thesis]. University of Illinois – Chicago; 2016. Available from: http://hdl.handle.net/10027/20900

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

15. Shibli, Aiman. Structural Behavior of Adhesively Bonded High Density Polyethylene Composite Beams.

Degree: 2016, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/20905

► Finding a sustainable and structural material for the civil infrastructure domain, while remaining financially feasible, is a challenge for engineers. Recycled Plastic Lumber (RPL) is… (more)

▼ Finding a sustainable and structural material for the civil infrastructure domain, while remaining financially feasible, is a challenge for engineers. Recycled Plastic Lumber (RPL) is identified as an excellent sustainable material used by the construction industry in non-load bearing applications. There is a demand and an opportunity to resolve the aforementioned challenge by migrating RPL into structural applications. Although RPL has significant sustainable and structural advantages, such as light weight, low cost and high resistance to environmental degradation, its usability in the civil infrastructure applications is still at its early stages due to a lack of design guidelines. Furthermore, due to the brittleness of the RPL material, joining RPL components impose another challenge for engineers. Recently, however, many structural industries have considered adhesive binding as an excellent candidate for replacing the traditional joining methods (e.g. bolting and riveting) for joining load-bearing components, especially for scenarios involving joining brittle materials such RPL. The attractiveness of adhesives stems from their unique combinations of properties, which include: high strength, light weight, dimensional stability, high resistance to environmental degradation and ease of use. Due to these unique characteristics and advantages, the use of adhesive joints is on the rise in structural applications. On the other hand, the traditional bolted joint methods have gone a long way in creating appropriate technologies and gained years of design experience, which cannot be easily replaced. Accordingly, switching from traditional joining methods to adhesive bonding in civil infrastructure applications requires a large investment to establish a level of understanding comparable to that associated with traditional joining methods. In particular, it is crucial to characterize and fully understand bonded joint behaviors, strength and failure properties, and to be able to predict them for given geometries and loads. This research addresses both challenges by providing design guidelines for utilizing RPL in load-bearing structural application and by fully characterizing the behavior of adhesively bonded RPL joints. For addressing the first challenge, this research covers structural and sustainability assessments of an RPL beam. Experimental and numerical results of the four-point bending structural assessment of RPL beams reinforced with Glass Fiber Reinforced Polymer (GFRP) indicate that as the amount of GFRP reinforcement area increases, the stiffness of the RPL increases up to four times linearly The results also indicate that optimizing the beam section by using an I-shape beam or a hollow beam can reduce the weight and increase the surface area, improving the heat treatment process while maintaining 90%-95% of the beam stiffness. Results of the three pillars of the sustainability assessment (environmental, economic and social) show that reinforced recycled plastic beams have great environmental benefits compared… Advisors/Committee Members: Issa, Mohsen (advisor), Foster, Craig (committee member), Chudnovsky, Alexander (committee member), Shabana, Ahmed (committee member), Reddy, Krishna (committee member).

Subjects/Keywords: RPL; Reinforced Polymer; Structural Adhesive; Composites; Stiffness; Infrastructure; Civil Structure; Finite Element Analysis (FEA).

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Shibli, A. (2016). Structural Behavior of Adhesively Bonded High Density Polyethylene Composite Beams. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/20905

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Shibli, Aiman. “Structural Behavior of Adhesively Bonded High Density Polyethylene Composite Beams.” 2016. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/20905.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Shibli, Aiman. “Structural Behavior of Adhesively Bonded High Density Polyethylene Composite Beams.” 2016. Web. 21 Jan 2021.

Vancouver:

Shibli A. Structural Behavior of Adhesively Bonded High Density Polyethylene Composite Beams. [Internet] [Thesis]. University of Illinois – Chicago; 2016. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/20905.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shibli A. Structural Behavior of Adhesively Bonded High Density Polyethylene Composite Beams. [Thesis]. University of Illinois – Chicago; 2016. Available from: http://hdl.handle.net/10027/20905

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

16. Kaliappan, Raja Shankar. Sediment capping effects on gas ebullition, hyporheic exchange and benthic microbial community structure.

Degree: 2016, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/20950

► The research described in this dissertation added to the current body of literature on the effectiveness of active capping in mitigating ebullition facilitated contaminant fluxes… (more)

▼ The research described in this dissertation added to the current body of literature on the effectiveness of active capping in mitigating ebullition facilitated contaminant fluxes and in lowering gas ebullition rates, during an active capping sediment remediation in the WBGCR. The three-year post-capping study provided a comprehensive dataset on ebullition rates and the influence of environmental parameters with reductions in gas ebullition rates of 84%, 63% and 61%. The post-capping gas fluxes were also strongly influenced by sediment temperature and water depth. Incubation experiments to assess gas production potential of the post-cap sediment layers showed that cumulative gas production was similar in the contaminated sediment (CSed) and new deposit (ND) layers, whereas the armor (GAL) and organoclay (OrgC) layers exhibited minimal gas production. These results provide further evidence that the CSed layer is ebullition active and thus continued ebullition is likely following capping. This study also evaluated active capping performance in mitigating ebullition-facilitated metal and PAH transport. Metal fluxes were lowered by 89-97% with re-suspension of surficial sediment being the primary mode of transport. PAH fluxes also fell sharply in the first year but increased to 60% of pre-capping levels in 2013 and followed again by a decrease in 2014. The rise and fall of PAH flux in 2013 and 2014 were accompanied by a rise and fall of sediment temperature although average gas fluxes were similar. This suggests that the higher temperatures stimulated increased gas production in the CSed layer thereby increasing PAH partition and transport for 2013. Increases in sediment temperatures could reactivate gas generation in the CSed layer, with subsequent potential for cap fracture, enhanced advective transport and lower design breakthrough times. The impact of capping on the sediment Archaeal community structure was evaluated by using phylogenetic analysis of 16 sRNA genes from pre- and post-capping sediment. The archaeal community structure was dominated by methanogens in both pre-and post-capping sediment. Capping resulted in a more diverse distribution of methanogens in the surficial zone, with evidence of methanogenesis occurring via the three major methanogenic pathways: hydrogenotrophic, acetoclastic and C1-methylotrophic methanogenesis where as pre-cap Archaea were dominated by acetoclastic and hydrogenotrophic methanogens. Field measured gas fluxes were also significantly correlated with Methanosaeta abundance in pre- and post-capping sediment, suggesting that acetoclastic methanogenesis controls gas production in the GCR. The analysis also revealed the presence of Ammonia Oxidizing Archaea (AOA) in increasing abundance with depth, suggesting a more important role for these newly discovered group in contaminated sediments. This research also explored the potential for using heat tracer methods to evaluate GW-SW interactions and the Darcy velocity in different layers of post-cap sediment. Two approaches utilizing… Advisors/Committee Members: Rockne, Karl J. (advisor), Khodadoust, Amid P. (committee member), O'Connor, Benjamin L. (committee member), Foster, Craig D. (committee member), Rani, Asha (committee member).

Subjects/Keywords: Impact of capping; Sediment gas ebullition; ebullition facilitated contaminant flux; active capping; ebullition facilitated PAH flux; ebullition facilitated metal flux; Archaea; Archaeal community structure; methanogenic archaea; groundwater surface water exchange; hyporheic exchange; Heat tracer; heat transport modeling

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APA (6^th Edition):

Kaliappan, R. S. (2016). Sediment capping effects on gas ebullition, hyporheic exchange and benthic microbial community structure. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/20950

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kaliappan, Raja Shankar. “Sediment capping effects on gas ebullition, hyporheic exchange and benthic microbial community structure.” 2016. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/20950.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kaliappan, Raja Shankar. “Sediment capping effects on gas ebullition, hyporheic exchange and benthic microbial community structure.” 2016. Web. 21 Jan 2021.

Vancouver:

Kaliappan RS. Sediment capping effects on gas ebullition, hyporheic exchange and benthic microbial community structure. [Internet] [Thesis]. University of Illinois – Chicago; 2016. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/20950.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kaliappan RS. Sediment capping effects on gas ebullition, hyporheic exchange and benthic microbial community structure. [Thesis]. University of Illinois – Chicago; 2016. Available from: http://hdl.handle.net/10027/20950

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

17. Sweetman, Brian J. Cerebrospinal Fluid Flow in Normal and Hydrocephalic Brains.

Degree: 2012, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/8357

► The flow rates and velocities of cerebrospinal fluid (CSF) in the central nervous system (CNS) can be measured using advanced imaging modalities such as cine-phase-contrast-MRI,… (more)

▼ The flow rates and velocities of cerebrospinal fluid (CSF) in the central nervous system (CNS) can be measured using advanced imaging modalities such as cine-phase-contrast-MRI, but the driving forces behind CSF motion are not fully understood. Recent clinical measurements create the observations necessary to establish a relationship between cerebral blood flow dynamics and pulsatile CSF flow. However, a fundamental mathematical model useful for interpreting and quantifying the dynamic force balances between expanding cerebral vasculature, deformable brain tissue, and displaceable CSF does not yet exist. To bridge the gap between observations of a blood-CSF flow relationship and insight into how these mechanisms occur in reality, this dissertation proposes a multi-scale modeling approach for explaining and quantifying the interactions between expanding vasculature, brain tissue, and CSF. The core hypothesis of this dissertation is that the oscillatory CSF flow is due to pulsating cerebral vasculature expansion. To test this hypothesis, an integrated model of cerebral vasculature, brain tissue, and CSF is presented. Brain and CSF domains were generated from medical images and spatially discretized using the finite volume method. Large arteries of the vasculature network were reconstructed from medical images and an automatic vessel growth algorithm was used to generate regions of microvasculature. The completed vasculature domain was represented as a complex, continuous network of cylindrical tubes. In the model, cerebral blood flow, pressures, and vessel expansion are solved in the entire vascular network. Changes in vessel caliber are transmitted to the brain as a volumetric strain, thus inducing tissue displacement. The deforming brain, in turn, accelerates the CSF throughout the cranial fluid space. The displacement of the brain tissue is governed by a steady-state linear momentum balance with an underlying linear-elastic constitutive model. CSF flow is predicted by solving mass and momentum balances using the SIMPLE (semi-implicit method for pressure linked equations) algorithm for incompressible fluids. Because the CSF space is deformable due to motion along the CSF-brain tissue boundary, the fluid equations are written in an Arbitrary-Lagrangian-Eulerian framework. A mesh displacement scheme was implemented to maintain fluid grid integrity. The model predicts a pulsatile CSF flow pattern that matches in magnitude and timing the in vivo measurements of normal and hydrocephalic patients. Although the close match does not prove the original hypothesis is true, it does provide a rational explanation for the driving forces of intracranial dynamics of the CNS. This extensive undertaking has resulted in the first fully integrated model of vasculature, brain, and CSF, and is an important step toward quantifying complex biomechanical interactions in the brain. Advisors/Committee Members: Linninger, Andreas A. (advisor), Royston, Thomas (committee member), Foster, Craig (committee member), Xenos, Michalis (committee member), Hettiarachchi, Madhawa (committee member).

Subjects/Keywords: Computational Fluid Dynamics; Cerebral Vasculature; Space Conservation Law; Arbitrary Lagrangian Eulerian

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sweetman, B. J. (2012). Cerebrospinal Fluid Flow in Normal and Hydrocephalic Brains. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/8357

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sweetman, Brian J. “Cerebrospinal Fluid Flow in Normal and Hydrocephalic Brains.” 2012. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/8357.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sweetman, Brian J. “Cerebrospinal Fluid Flow in Normal and Hydrocephalic Brains.” 2012. Web. 21 Jan 2021.

Vancouver:

Sweetman BJ. Cerebrospinal Fluid Flow in Normal and Hydrocephalic Brains. [Internet] [Thesis]. University of Illinois – Chicago; 2012. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/8357.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sweetman BJ. Cerebrospinal Fluid Flow in Normal and Hydrocephalic Brains. [Thesis]. University of Illinois – Chicago; 2012. Available from: http://hdl.handle.net/10027/8357

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

18. Bogdan, Dorin. Removal of Bisphenol A from Water using Iron Oxide Adsorbents.

Degree: 2013, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/9779

► Bisphenol A (BPA), an industrial chemical used mainly in the plastics manufacturing industry, may be hazardous to humans via estrogenic activity and has recently been… (more)

▼ Bisphenol A (BPA), an industrial chemical used mainly in the plastics manufacturing industry, may be hazardous to humans via estrogenic activity and has recently been designated as an endocrine disrupting compound (EDC). The aqueous medium is the major route of contamination of water with BPA through industrial water discharge, landfill leachate infiltration, and wastewater treatment plant effluent. A risk assessment of BPA indicates adverse health effects for environmentally relevant concentrations of BPA using different ingestion scenarios. Therefore, the removal of BPA from water is necessary to decrease the risk of human exposure to water contaminated with BPA. The removal of BPA from water was investigated using adsorption of BPA onto several iron oxide adsorbents: two magnetites (Fe3O4) and one hematite (Fe2O3). Iron oxides may serve as sustainable adsorbents due to lower cost and ease of regeneration using a blast furnace, when compared to organic adsorbents such as activated carbon. The adsorption of BPA from water onto iron oxide adsorbents was evaluated as a function of pH, ionic strength, time, adsorbent dosage, and type of adsorbent. The effect of pH on adsorption was investigated, showing that hematite H was able to remove more BPA at lower pH values. The maximum adsorption capacities on hematite at pH 2 were found to range from 253 to 302 mg/kg and from 337 to 396 mg/kg after 2 and 7 days, respectively. The effect of solution ionic strength on adsorption was investigated. There was a positive effect on adsorption due to calcium with and without bicarbonate with an increase in the adsorption with increasing ionic strength. The effect of potassium was not as strong as the effect of calcium. The results from this research show that the removal of BPA using hematite under acidic conditions has the potential to be developed into a technology for removal of BPA from water and wastewater. Statistical analysis of the data using multivariate linear regression (MLR) models determined the independent variables having the greatest effect on the adsorption and removal of BPA from water. Advisors/Committee Members: Khodadoust, Amid P. (advisor), Reddy, Krishna (committee member), Foster, Craig (committee member), McNallan, Michael (committee member), Mansoori, G. Ali (committee member).

Subjects/Keywords: Bisphenol A; Removal of Bisphenol A; BPA; Adsorption of Bisphenol A; Removal of Bisphenol A from water

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bogdan, D. (2013). Removal of Bisphenol A from Water using Iron Oxide Adsorbents. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/9779

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Bogdan, Dorin. “Removal of Bisphenol A from Water using Iron Oxide Adsorbents.” 2013. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/9779.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Bogdan, Dorin. “Removal of Bisphenol A from Water using Iron Oxide Adsorbents.” 2013. Web. 21 Jan 2021.

Vancouver:

Bogdan D. Removal of Bisphenol A from Water using Iron Oxide Adsorbents. [Internet] [Thesis]. University of Illinois – Chicago; 2013. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/9779.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bogdan D. Removal of Bisphenol A from Water using Iron Oxide Adsorbents. [Thesis]. University of Illinois – Chicago; 2013. Available from: http://hdl.handle.net/10027/9779

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

19. Zaher, Mohamed H. Real Time Energy Management Control Strategies for Hybrid Powertrains.

Degree: 2013, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/10025

► In order to improve fuel efficiency and reduce emissions of mobile vehicles, various hybrid power-train concepts have been developed over the years. This thesis focuses… (more)

Subjects/Keywords: Hybrid Powertrain; State of Charge; Embedded Control; Downsized Engine

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APA (6^th Edition):

Zaher, M. H. (2013). Real Time Energy Management Control Strategies for Hybrid Powertrains. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/10025

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zaher, Mohamed H. “Real Time Energy Management Control Strategies for Hybrid Powertrains.” 2013. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/10025.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zaher, Mohamed H. “Real Time Energy Management Control Strategies for Hybrid Powertrains.” 2013. Web. 21 Jan 2021.

Vancouver:

Zaher MH. Real Time Energy Management Control Strategies for Hybrid Powertrains. [Internet] [Thesis]. University of Illinois – Chicago; 2013. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/10025.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zaher MH. Real Time Energy Management Control Strategies for Hybrid Powertrains. [Thesis]. University of Illinois – Chicago; 2013. Available from: http://hdl.handle.net/10027/10025

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

20. Gantoi, Florentina M. New Computational Framework for Biomechanical Multibody System Applications.

Degree: 2013, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/10179

► Most of the computational finite element (FE)-based bio-mechanics models employ static or quasi-static assumptions. These models fail to capture the response of the human body… (more)

▼ Most of the computational finite element (FE)-based bio-mechanics models employ static or quasi-static assumptions. These models fail to capture the response of the human body and its joints to high speed cyclic loading. They also fail to accurately capture the change in the system motion that is governed by highly nonlinear differential and algebraic equations. This thesis aims at addressing this important issue by developing a new computational framework for modeling human body and its joints, with particular interest in the knee joint mechanics. The new computational framework is based on successful integration of multibody system (MBS) and large displacement FE algorithms. In this new computational framework, the absolute nodal coordinate formulation (ANCF) is used as the basis for the description of the rigid geometry as well as the deformation of the very flexible ligaments. ANCF finite elements have many desirable features that can be exploited in modeling complex bio-mechanics systems. These elements can be used to capture the deformations of the ligament cross sections, allow for the use of general material laws that are suited for developing accurate ligament models, have a constant inertia matrix that lead to an optimum sparse matrix structure, and their kinematic description is consistent with the description used in computational geometry methods, thereby allowing for converting CAD models to FE meshes without geometry distortion. The new computational framework used in this thesis also allow for modeling more general boundary conditions at the ligament bone insertion sites. The approach described in this thesis can be used to develop more realistic models of the human body joints and is applicable to future research studies on ligaments, muscles and soft tissues (LMST). Advisors/Committee Members: Shabana, Ahmed (advisor), Brown, Michael (committee member), Foster, Craig (committee member), Lilley, Carmen (committee member), Royston, Thomas (committee member).

Subjects/Keywords: ANCF; KNEE JOINT; LIGAMENT FINITE ELEMENT; FULLY CLAMPED JOINT; TANGENT FRAME; CONTACT FORMULATIONS

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gantoi, F. M. (2013). New Computational Framework for Biomechanical Multibody System Applications. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/10179

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gantoi, Florentina M. “New Computational Framework for Biomechanical Multibody System Applications.” 2013. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/10179.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gantoi, Florentina M. “New Computational Framework for Biomechanical Multibody System Applications.” 2013. Web. 21 Jan 2021.

Vancouver:

Gantoi FM. New Computational Framework for Biomechanical Multibody System Applications. [Internet] [Thesis]. University of Illinois – Chicago; 2013. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/10179.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gantoi FM. New Computational Framework for Biomechanical Multibody System Applications. [Thesis]. University of Illinois – Chicago; 2013. Available from: http://hdl.handle.net/10027/10179

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

21. Al Hijaj, Mutaz. Behavior and Design of Skewed Extended Shear Tab Connections.

Degree: 2016, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/21548

► Extended shear tab connections has been introduced in the thirteenth edition of the American Institute of Steel Construction Manual to the structural engineering practice as… (more)

▼ Extended shear tab connections has been introduced in the thirteenth edition of the American Institute of Steel Construction Manual to the structural engineering practice as an alternative to the single plate or as known the shear tab connections. The function of the extended shear tab connection is to transfer the shear force from the beam to the supporting member (column or girder). The main advantage of using extended shear tab connections is to avoid coping of beams in the vicinity of the joint to bring the beam close to the web of the supporting member. Previous studies investigated the behavior of extended shear tab connections for members, joined at right angle, experimentally and analytically. Skewed connections, in general, are commonly used in practice to frame members that their longitudinal axes do not meet at a right angle; the use of extended shear tab connections for skewed members eliminates the excessive beam ends cutting and modifications which makes this type of connections attractive to engineers and fabricators. This study investigates the behavior and design of different configurations of skewed extended shear tab connections using the finite element analysis software ABAQUS. The study investigated three configurations of the skewed extended shear tab connections: 1) With the plate unstiffened and welded to supporting member web (flexible support), 2) With the plate unstiffened and welded to the supporting member flange (rigid support), 3) And with the plate welded to stiffener plates and supporting member web. To achieve the study goals, finite element analysis for orthogonal configurations were performed. Results were compared with their counterparts obtained from experimental investigation to verify the finite element models. Then, the models were skewed at different angles with results obtained and compared. It was observed that for stiffened configurations and unstiffened configurations with rigid support, the connection bending and torsional behavior slightly affected by the connections orientation. On the other hand, for the unstiffened configuration with flexible support, the connection behavior significantly affected by the connection orientation, especially the torsional behavior. A design procedure was proposed based on a parametric study that was performed for skewed extended shear tab connections based on results obtained from finite element analysis for 300 models with different configurations. The variable parameters used for this study are: plate thickness, the distance between the weld line and the bolt line, skewed angle, and number of bolts. These parameters were investigated in terms of the connection vertical displacement, plate twist along the bolt line, plate twist along the weld line, and the connection shear capacity. Based on the parametric study results, a specific design procedure for the skewed extended shear tab connections was proposed and compared with the current design procedure in the AISC Manual 14th edition. Modifications to the current connection lateral… Advisors/Committee Members: Mahamid, Mustafa (advisor), Foster, Craig (committee member), Chi, Sheng-Wei (committee member), Ozevin, Didem (committee member), Fanella, David (committee member), Ansari, Farhad (chair).

Subjects/Keywords: Extended Shear Tab; Skewed Connections; Flexible Supports; Rigid Supports; Twist; Torsional Moment; ABAQUS.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Al Hijaj, M. (2016). Behavior and Design of Skewed Extended Shear Tab Connections. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/21548

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Al Hijaj, Mutaz. “Behavior and Design of Skewed Extended Shear Tab Connections.” 2016. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/21548.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Al Hijaj, Mutaz. “Behavior and Design of Skewed Extended Shear Tab Connections.” 2016. Web. 21 Jan 2021.

Vancouver:

Al Hijaj M. Behavior and Design of Skewed Extended Shear Tab Connections. [Internet] [Thesis]. University of Illinois – Chicago; 2016. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/21548.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Al Hijaj M. Behavior and Design of Skewed Extended Shear Tab Connections. [Thesis]. University of Illinois – Chicago; 2016. Available from: http://hdl.handle.net/10027/21548

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

22. Salman, Nassr Noori Ibrahim. Parametric Investigation of Integral Abutment Bridges: Behavior and Pile Buckling Analysis.

Degree: 2018, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/23139

► Integral Abutment bridges (IABs) are special types of bridges where expansion joints in the superstructure are eliminated and the thermally induced lateral demand is transferred… (more)

▼ Integral Abutment bridges (IABs) are special types of bridges where expansion joints in the superstructure are eliminated and the thermally induced lateral demand is transferred to the supporting substructure system. As such, the substructure system moves back and forth following seasonal bridge expansion and contraction. These bridges have gained a wide popularity and have become a preferred choice among Department of Transportations and design offices around the world because they have numerous advantages over the conventional bridges, including low construction and maintenance cost, longer serviceability and higher stability, improved riding quality and better seismic performance. Although of the proven advantages of IABs, there are no uniform national guidelines for designing or constructing these structures, and each US state has its own design limitations based on experience and performance of the previously constructed bridges. Absence of the design guidelines is attributed to their complex behavior which is not fully understood. The current study is two-fold; the first part involves a calibration process for an instrumented bridge using a three-dimensional finite element (FE) model. The abutment and pile displacements were calibrated with their experimental counterparts. Several shrinkage models and temperature gradient scenarios were examined to predict the most representative parameters in simulating realistic behavior. Based on the calibration process, a parametric study was conducted to investigate the effect of bridge length, pile size and orientation, and type and stiffness of the soil around the pile on the critical bridge responses which include: abutment displacement, pile displacement, and deck and girder stresses. The second part addresses pile buckling under combined effect of axial load and lateral cyclic displacement. Eleven detailed nonlinear finite element models, experimentally validated, were established for steel HP sections with two axis orientations to estimate the displacement capacities of the piles supporting IABs. A coupon test-validated cyclic plasticity model is incorporated in the finite element analysis to capture the hysteresis of the steel behavior under cyclic loading. Displacement capacities are also compared with an available analytical method. Length limits for IABs were estimated based on displacement capacities of the HP sections and are compared with the limitations of the US Department of Transportations’ current practice. Design recommendations for IABs are also presented. Advisors/Committee Members: Issa, Mohsen (advisor), Shabana, Ahmed (committee member), Foster, Craig (committee member), Reddy, Krishna (committee member), Karpov, Eduard (committee member), Issa, Mohsen (chair).

Subjects/Keywords: Integral abutment bridges; Finite element simulation of IAB behavior; Pile buckling analysis; Displacement capacities of HP piles under combined axial and lateral cyclic loading

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Salman, N. N. I. (2018). Parametric Investigation of Integral Abutment Bridges: Behavior and Pile Buckling Analysis. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/23139

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Salman, Nassr Noori Ibrahim. “Parametric Investigation of Integral Abutment Bridges: Behavior and Pile Buckling Analysis.” 2018. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/23139.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Salman, Nassr Noori Ibrahim. “Parametric Investigation of Integral Abutment Bridges: Behavior and Pile Buckling Analysis.” 2018. Web. 21 Jan 2021.

Vancouver:

Salman NNI. Parametric Investigation of Integral Abutment Bridges: Behavior and Pile Buckling Analysis. [Internet] [Thesis]. University of Illinois – Chicago; 2018. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/23139.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Salman NNI. Parametric Investigation of Integral Abutment Bridges: Behavior and Pile Buckling Analysis. [Thesis]. University of Illinois – Chicago; 2018. Available from: http://hdl.handle.net/10027/23139

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

23. Desai, Chintan Janak. Generalization of Strain Split Method for Locking Alleviation of Initially Curved Structures.

Degree: 2018, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/23336

► This thesis discusses the generalization of the strain-split method (SSM) for the locking alleviation of curved structures. The generalization is achieved by using proper definitions… (more)

Subjects/Keywords: ANCF benchmarking; locking problems; strain split method; beam structures; plate structures; Multi-Body Dynamics; Poisson locking

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Desai, C. J. (2018). Generalization of Strain Split Method for Locking Alleviation of Initially Curved Structures. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/23336

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Desai, Chintan Janak. “Generalization of Strain Split Method for Locking Alleviation of Initially Curved Structures.” 2018. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/23336.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Desai, Chintan Janak. “Generalization of Strain Split Method for Locking Alleviation of Initially Curved Structures.” 2018. Web. 21 Jan 2021.

Vancouver:

Desai CJ. Generalization of Strain Split Method for Locking Alleviation of Initially Curved Structures. [Internet] [Thesis]. University of Illinois – Chicago; 2018. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/23336.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Desai CJ. Generalization of Strain Split Method for Locking Alleviation of Initially Curved Structures. [Thesis]. University of Illinois – Chicago; 2018. Available from: http://hdl.handle.net/10027/23336

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

24. Hamed, Ashraf M. New Finite Element Mesh for Efficient Modeling of Spatial Flexible Link Articulated Systems.

Degree: 2014, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/19079

► This work introduces new FE/MBS meshes that employ linear connectivity conditions and allow for arbitrarily large rigid body displacements between the finite elements. A linear… (more)

▼ This work introduces new FE/MBS meshes that employ linear connectivity conditions and allow for arbitrarily large rigid body displacements between the finite elements. A linear formulation of rotational joints is systematically obtained using the absolute nodal coordinate formulation finite elements. The algebraic joint constraint equations are introduced at a preprocessing stage to efficiently eliminate dependent coordinates. The proposed joints allow for joint deformation modes, and therefore, this joint formulation can be considered a generalization of the pin joint formulation used in rigid MBS analysis. The proposed joint deformation modes allow for the calculations of the joint strains which can be discontinuous as the result of the finite relative rotation. Because ANCF finite elements lead to a constant mass matrix, an identity generalized mass matrix can be obtained for the FE mesh despite the fact that the finite elements of the mesh are not rigidly connected. The new linear flexible chain meshes are used for the modeling of different MBS models including flexible belt chains and a typical flexible link tracked vehicle. The constant inertia and the linear connectivity conditions lead to significant reduction in the dimensions and the number of non-zero entries of matrices that are used at the position, velocity, and acceleration analysis steps. This dissertation also examines the limitations of using B-spline representation as an analysis tool by comparing its geometry with the ANCF geometry. It is shown that while both B-spline and ANCF geometries can be used to model non-structural discontinuities, there are fundamental differences between B-spline and ANCF geometries. First, while B-spline geometry can always be converted to ANCF geometry, the converse is not true; that is, ANCF geometry cannot always be converted to B-spline geometry. Second, the rigid structure of the B-spline recurrence formula restricts the order of the basis functions used in the polynomial interpolation. This leads to models with significantly larger number of degrees of freedom as compared to those obtained using ANCF. Third, in addition to the known fact that B-spline does not allow for straightforward modeling of T-junctions, B-spline representation cannot be used in a straightforward manner to model structural discontinuities. Advisors/Committee Members: Shabana, Ahmed A. (advisor), Foster, Craig (committee member), Jayakumar, Paramsothy (committee member), Karpov, Eduard (committee member), Recuero, Antonio (committee member), Royston, Thomas (committee member).

Subjects/Keywords: Articulated systems; Finite elements; Flexible Multibody systems; ANCF; Rotational Joints; Elastic forces formulations

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hamed, A. M. (2014). New Finite Element Mesh for Efficient Modeling of Spatial Flexible Link Articulated Systems. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/19079

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hamed, Ashraf M. “New Finite Element Mesh for Efficient Modeling of Spatial Flexible Link Articulated Systems.” 2014. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/19079.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hamed, Ashraf M. “New Finite Element Mesh for Efficient Modeling of Spatial Flexible Link Articulated Systems.” 2014. Web. 21 Jan 2021.

Vancouver:

Hamed AM. New Finite Element Mesh for Efficient Modeling of Spatial Flexible Link Articulated Systems. [Internet] [Thesis]. University of Illinois – Chicago; 2014. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/19079.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hamed AM. New Finite Element Mesh for Efficient Modeling of Spatial Flexible Link Articulated Systems. [Thesis]. University of Illinois – Chicago; 2014. Available from: http://hdl.handle.net/10027/19079

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

25. Lotfy, Ibrahim. Structural Performance of High Density Polyethylene Crossties and Use in Accelerated Bridge Construction.

Degree: 2015, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/19761

► Hardwood timber has been the predominant material of choice for crossties since the establishment of the railroad industry in the US. Recently, several concerns, including… (more)

▼ Hardwood timber has been the predominant material of choice for crossties since the establishment of the railroad industry in the US. Recently, several concerns, including higher speeds, heavier loads, durability and negative environmental effects associated with deforestation and wood-treating chemicals, have invoked the railroad industry’s interest in alternative materials for crossties. Currently, several manufacturers offer alternative and sustainable solutions using different recycled plastic composite materials. Thousands of plastic crossties are currently in service in a wide variety of railroad applications. Several researchers have been studying and testing these new materials, specifically High Density Polyethylene, however, their behavior when subjected to rail loading is not fully understood yet. Uncertainties in mechanical properties, failure modes, fracture, spike holding and loosening, tie-plate cutting and durability render their performance and safety questionable. More research is required to properly characterize, describe and model the behavior of these materials as well as assess the feasibility of implementing these materials in railway applications in terms of performance, safety, practicality, and economy. Therefore, the research effort presented in this thesis aimed to investigate the performance of plastic composite crossties through experimental testing and analytical modeling then evaluate the feasibility of implementing them in Accelerated Bridge Construction. A comprehensive testing program addressing several AREMA recommended test methods for engineered composite crosstie was conducted. The mechanical properties and behavior of the crossties and the fastening system assembly were evaluated for the individual components as well as the entire system. Analytical material models, capable of simulating the behavior of plastic crosstie and its interaction with the fastening system were constructed and calibrated using the experimental data. These models were then implemented in two full-scale modeling applications using Accelerated Bridge Construction techniques for railroad elevated structure applications. The plastic composite crossties demonstrated adequate performance throughout the experimental testing program. Additionally, the finite element modeling of the full-scale bridge applications served as a proof of concept for future implementation of plastic crossties in railroad bridges. This research also highlights the potential structural, social, and economic benefits of implementing High Density Polyethylene crossties in railroad applications. Advisors/Committee Members: Issa, Mohsen A. (advisor), Shabana, Ahmed (committee member), Foster, Craig (committee member), Reddy, Krishna (committee member), Chudnovsky, Alexander (committee member), Karpov, Eduard (committee member).

Subjects/Keywords: High Density Polyethylene Crossties; Railroad crossties; Accelerated Bridge Construction; Recycled plastic crossties

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APA (6^th Edition):

Lotfy, I. (2015). Structural Performance of High Density Polyethylene Crossties and Use in Accelerated Bridge Construction. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/19761

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lotfy, Ibrahim. “Structural Performance of High Density Polyethylene Crossties and Use in Accelerated Bridge Construction.” 2015. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/19761.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lotfy, Ibrahim. “Structural Performance of High Density Polyethylene Crossties and Use in Accelerated Bridge Construction.” 2015. Web. 21 Jan 2021.

Vancouver:

Lotfy I. Structural Performance of High Density Polyethylene Crossties and Use in Accelerated Bridge Construction. [Internet] [Thesis]. University of Illinois – Chicago; 2015. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/19761.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lotfy I. Structural Performance of High Density Polyethylene Crossties and Use in Accelerated Bridge Construction. [Thesis]. University of Illinois – Chicago; 2015. Available from: http://hdl.handle.net/10027/19761

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

26. Gao, Jing. Design, Improvement and Fundamental Studies on Aprotic Lithium-Oxygen Batteries.

Degree: 2015, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/19814

► In the family of rechargeable batteries, the Li-O2 battery has the largest theoretical energy density and thus is considered to be a promising candidate for… (more)

▼ In the family of rechargeable batteries, the Li-O2 battery has the largest theoretical energy density and thus is considered to be a promising candidate for the next generation of the rechargeable battery. However, there are challenges in the development of Li-O2 batteries, such as the high overpotential and the short cycle-life. Several aprotic Li-O2 battery designs have been reported with a low overpotential; however, their high cost limits the application of those battery designs. Moreover, there is not a full understanding of the discharge products so far. Therefore, our goal is to develop an aprotic Li-O2 battery combining a good performance with a low cost and investigate the mechanism of the cell reactions as well. The objectives of this dissertation are to design a new cathode for the aprotic Li-O2 battery to reduce the overpotential, and to investigate the mechanisms of the discharge reactions in an aprotic Li-O2 battery. In the presented work, the SPPd6 cathode was designed based on a nanoscale Pd catalyst via thermal evaporation and was evaluated with Swagelok testing cells, which reduced the charge overpotential from more than 1V to about 0.2V and increased the cycle-efficiency from 62~70% to 80~84%. Other advantages were also found on this new-kind cathode, such as less degradation and prolonged working life. Behaviors of a SPPd6-based cell were investigated to get an understanding of the issues in an aprotic Li-O2 battery, including the drop of discharge voltage and the capacity fading. Discharge products were probed on the discharged active carbon cathode to study the mechanism of the oxygen reduction reaction (ORR). The results agree with the disproportionation reaction for the formation of Li2O2. An electrochemical-peeling strategy was developed to investigate the composition and structure of the toroid, by which the structure of a toroid with a LiO2-like compound on the surface and Li2O2 in the core was revealed. Advisors/Committee Members: Indacochea, Ernesto J. (advisor), Wang, Hsien-Hau (advisor), Wang, Hsien-Hau (committee member), McNallan, Michae J. (committee member), Foster, Craig D. (committee member), Karpov, Eduard (committee member).

Subjects/Keywords: Lithium-oxygen battery; Pd catalyst; low overpotential; toroid

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APA (6^th Edition):

Gao, J. (2015). Design, Improvement and Fundamental Studies on Aprotic Lithium-Oxygen Batteries. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/19814

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gao, Jing. “Design, Improvement and Fundamental Studies on Aprotic Lithium-Oxygen Batteries.” 2015. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/19814.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gao, Jing. “Design, Improvement and Fundamental Studies on Aprotic Lithium-Oxygen Batteries.” 2015. Web. 21 Jan 2021.

Vancouver:

Gao J. Design, Improvement and Fundamental Studies on Aprotic Lithium-Oxygen Batteries. [Internet] [Thesis]. University of Illinois – Chicago; 2015. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/19814.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gao J. Design, Improvement and Fundamental Studies on Aprotic Lithium-Oxygen Batteries. [Thesis]. University of Illinois – Chicago; 2015. Available from: http://hdl.handle.net/10027/19814

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

27. Motamedi, MohammadHosein. Numerical Simulation of Mechanical Response of Geomaterials from Strain Hardening to Localized Failure.

Degree: 2016, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/20834

► The Sandia GeoModel is a continuum elastoplastic constitutive model which captures many features of the mechanical response for geological materials over a wide range of… (more)

Subjects/Keywords: Plasticity; Numerical Methods; Fracture Mechanics; Crack Propagation; Geomechanics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Motamedi, M. (2016). Numerical Simulation of Mechanical Response of Geomaterials from Strain Hardening to Localized Failure. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/20834

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Motamedi, MohammadHosein. “Numerical Simulation of Mechanical Response of Geomaterials from Strain Hardening to Localized Failure.” 2016. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/20834.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Motamedi, MohammadHosein. “Numerical Simulation of Mechanical Response of Geomaterials from Strain Hardening to Localized Failure.” 2016. Web. 21 Jan 2021.

Vancouver:

Motamedi M. Numerical Simulation of Mechanical Response of Geomaterials from Strain Hardening to Localized Failure. [Internet] [Thesis]. University of Illinois – Chicago; 2016. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/20834.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Motamedi M. Numerical Simulation of Mechanical Response of Geomaterials from Strain Hardening to Localized Failure. [Thesis]. University of Illinois – Chicago; 2016. Available from: http://hdl.handle.net/10027/20834

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

28. Kamali Zonouzi, Negar. Enriched Numerical Method for Wave Propagation and Assessing Material Damage Using Nonlinear Acoustics.

Degree: 2018, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/23285

► When ultrasonic waves propagate through media, the material nonlinearity triggers the generation of higher-order harmonics (HOH), the frequency of which are integer multiples of the… (more)

▼ When ultrasonic waves propagate through media, the material nonlinearity triggers the generation of higher-order harmonics (HOH), the frequency of which are integer multiples of the excitation frequency. In nonlinear ultrasonic techniques, the HOH can be measured and related to material damage. In order to enhance the measurement of HOH, wavelet-based signal processing algorithms are introduced to obtain the second harmonic-based and third harmonic-based acoustic nonlinearity parameters. The HOH generation, however, can be triggered by many sources. Finite element numerical modeling with mesoscale heterogeneities explicitly modeled for the nonlinear wave propagation is presented to understand HOH generation due to heterogeneity and non-uniform deformations. Numerical studies indicate that non-uniform variations in different length scales affect the generation of both the second and the third-harmonics and that both second- and third-harmonics acoustic nonlinearity parameters grow with the increase of plastic strain level. However, the third-harmonics acoustic nonlinearity parameter is more sensitive when micro-, meso- and macrostructural variations are considered. The numerical results and predictions are validated with nonlinear ultrasonic experiments and microscale imaging, including X-ray Diffraction (XRD) scanning. Since the frequency of ultrasonic signals are generally high, excessively fine mesh is required to obtain desired solution accuracy for HOH. Therefore, second part of this thesis is devoted to the development of enhanced numerical methods to effectively solve for linear and nonlinear wave propagation problems. Two specific enriched methods are developed: enriched Finite Element (FE) and Harmonic-Enriched Reproducing Kernel Particle Method (RKPM). In enriched FE, standard FE shape functions are enriched with the characteristic solution of the wave propagation problems under the framework of partition of unity. Additional degrees of freedom are introduced in the discrete system for the enrichment functions. To further reduce the computational cost and benefit from the advantages of element free methods, a harmonic-enriched RKPM (H-RKPM) is newly developed. The desired harmonic functions are introduced as the basis function for construction of reproducing kernel and the reproducing condition is enforced. This approach allows the characteristic function to be embedded in the approximation without adding more degrees of freedom. As a result, the high frequency wave problem can be solved using less nodes, enhancing both computational efficiency and accuracy. The methods are verified with benchmark problems and their performance is compared with other conventional methods. Advisors/Committee Members: Chi, Sheng-Wei (advisor), Foster, Craig (committee member), Ozevin, Didem (committee member), Awanou, Gerard (committee member), Indacochea, Ernesto (committee member), Chi, Sheng-Wei (chair).

Subjects/Keywords: Computational mechanics; nonlinear ultrasonics; acoustics; enriched finite elements; finite elements; simulations; wave propagation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kamali Zonouzi, N. (2018). Enriched Numerical Method for Wave Propagation and Assessing Material Damage Using Nonlinear Acoustics. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/23285

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kamali Zonouzi, Negar. “Enriched Numerical Method for Wave Propagation and Assessing Material Damage Using Nonlinear Acoustics.” 2018. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/23285.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kamali Zonouzi, Negar. “Enriched Numerical Method for Wave Propagation and Assessing Material Damage Using Nonlinear Acoustics.” 2018. Web. 21 Jan 2021.

Vancouver:

Kamali Zonouzi N. Enriched Numerical Method for Wave Propagation and Assessing Material Damage Using Nonlinear Acoustics. [Internet] [Thesis]. University of Illinois – Chicago; 2018. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/23285.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kamali Zonouzi N. Enriched Numerical Method for Wave Propagation and Assessing Material Damage Using Nonlinear Acoustics. [Thesis]. University of Illinois – Chicago; 2018. Available from: http://hdl.handle.net/10027/23285

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

29. Siriaksorn, Thanakorn. Meshfree Methods for Geotechnical Disaster Simulation and Prediction.

Degree: 2016, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/21622

► This thesis presents meshfree frameworks based on the semi-Lagrangian Reproducing Kernel (RK) approximation to effectively handle extreme geotechnical events within one mathematical framework. The semi-Lagrangian… (more)

▼ This thesis presents meshfree frameworks based on the semi-Lagrangian Reproducing Kernel (RK) approximation to effectively handle extreme geotechnical events within one mathematical framework. The semi-Lagrangian RK approximation combines advantages of the Eulerian and Lagrangian formulations, that is, state variables follow material points while the approximation function is updated in the current configuration to allow extreme deformation and material separation. The approximation is extended to the u-p (displacement-pressure) formulation based on Biot's theory for considering poromechanics of geomaterials. Drucker-Prager plasticity with a single-parameter damage model is also employed to properly represent the behavior of the solid phase of geomaterials. Additionally, variationally consistent stabilized nodal integration schemes and kernel contact algorithms are introduced in the u-p semi-Lagrangian RK framework to enhance accuracy and stability of solutions using the Galerkin formulation and to naturally model arbitrary contacts. Detailed studies of the temporal stability of the frameworks are performed using the von Neumann method to provide a guideline of time step selection when explicit time integration schemes are adopted. The robustness and effectiveness of the proposed u-p semi-Lagrangian RK formulation is verified with FEM solutions in several slope stability analyses. The run-out simulation capability of the presented method is also validated with experimental data and actual data from a landslide site. The proposed framework can be applied to study other geotechnical events under extreme conditions, which is demonstrated in simulating the penetration process of a projectile penetrating into the soil. Additionally, the strong form collocation method with the RK approximation is introduced to study the poromechanics of geomaterials, as an alternative approach. The governing equations are directly solved in the strong formulation with the point collocation method, in which the domain integration is not required in contrast to the Galerkin weak formulation. The effectiveness of the method is studied and demonstrated in hyperelasticity, elastodynamics, and poroelasticity problems. Advisors/Committee Members: Chi, Sheng-Wei (advisor), Foster, Craig D. (committee member), Ozevin, Didem (committee member), Karpov, Eduard (committee member), Shabana, Ahmed (committee member), Chi, Sheng-Wei (chair).

Subjects/Keywords: meshfree methods; landslide simulations

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Siriaksorn, T. (2016). Meshfree Methods for Geotechnical Disaster Simulation and Prediction. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/21622

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Siriaksorn, Thanakorn. “Meshfree Methods for Geotechnical Disaster Simulation and Prediction.” 2016. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/21622.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Siriaksorn, Thanakorn. “Meshfree Methods for Geotechnical Disaster Simulation and Prediction.” 2016. Web. 21 Jan 2021.

Vancouver:

Siriaksorn T. Meshfree Methods for Geotechnical Disaster Simulation and Prediction. [Internet] [Thesis]. University of Illinois – Chicago; 2016. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/21622.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Siriaksorn T. Meshfree Methods for Geotechnical Disaster Simulation and Prediction. [Thesis]. University of Illinois – Chicago; 2016. Available from: http://hdl.handle.net/10027/21622

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Chicago

30. Farhat, Maen A. Structural Behavior of Full Scale Totally Precast Concrete Counterfort Retaining Wall System.

Degree: 2016, University of Illinois – Chicago

URL: http://hdl.handle.net/10027/21631

► Totally Prefabricated Concrete Counterfort Retaining Wall (TPCCRW) provides an alternative for conventional construction techniques to reduce the drawbacks associated with cast-in-place construction. TPCCRW is composed… (more)

▼ Totally Prefabricated Concrete Counterfort Retaining Wall (TPCCRW) provides an alternative for conventional construction techniques to reduce the drawbacks associated with cast-in-place construction. TPCCRW is composed of a precast concrete wall component (face panel and counterforts) and a base slab connected, on-site, through headed anchors. The anchors extend downward from the counterforts into shear pockets located in the precast base slab. While the structural design of TPCCRW shares some features with cast-in place systems, it also has specific requirements for anchor connections, strength of shear pockets, and counterfort design. The design of TPCCRW was developed according to AASHTO LRFD (2012) specifications and compared to an existing cast-in-place counterfort system in Chicago, IL, for both structural and economic performances. The design strength of TPCCRW (moment and shear) surpassed that of the existing system with an overall reduction in concrete volume of 57%. A parametric study identified a counterfort spacing-to-base length ratio of 0.35 and a counterfort extension-to-heel length ratio of 0.6 as optimal values. In addition, the overall structural behavior of TPCCRW was examined experimentally and analytically using Nonlinear Finite Element Analysis (NLFEA). A full scale prototype (20 ft 2 in. high and 13 ft 10 in. wide) was designed meeting the requirements of AASHTO LRFD specifications, assembled, constructed, instrumented and tested at the precast concrete plant. The design was optimized and validated using NLFEA. The precast components were connected through five headed anchors at each counterfort. The results showed that the wall experienced a deflection of 0.2 in. at its middle. The anchors succeeded to maintain serviceability and ultimate strength requirements. The proposed system required a unique method of construction. Therefore, the fabrication and construction procedures and guidelines required to accelerate the erection process on site were detailed. The system components can be fully assembled and set in place in less than 2 hours. Finally, the pullout behavior of headed anchors used in TPCCRW was examined experimentally and analytically using NLFEA. Eighteen precast concrete blocks (21 in. x 20 in.) having a truncated shear pocket identical to those used in TPCCRW were prepared, grouted with headed anchors, instrumented, and experimentally tested. The study took into consideration two different block thicknesses (14 in. and 6 in.), two IDOT certified types of headed anchors and types of concrete grout, different bar sizes (#6,7, #8, #9), and different embedment depths (12.5 in., 10 in., 8 in, and 6 in.). The structural behavior of the pullout specimens was characterized by yielding and fracture of steel anchors regardless of their size. Concrete breakout was witnessed in 14 in. thick concrete specimens made with #9 headed anchors and 6 in. embedment depth when the specimen was tested to ultimate. The experimental test results were verified using finite element analysis and compared… Advisors/Committee Members: Issa, Mohsen A. (advisor), Reddy, Krishna R. (committee member), Foster , Craig D. (committee member), Chudnovsky, Alexander (committee member), Shabana, Ahmed (committee member), Issa, Mohsen A. (chair).

Subjects/Keywords: Precast Concrete; Totally Precast Concrete Retaining wall system; Full Scale testing; Finite Element Analysis; Structural Design; Fabrication; Pullout Behavior; Headed anchors

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Farhat, M. A. (2016). Structural Behavior of Full Scale Totally Precast Concrete Counterfort Retaining Wall System. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/21631

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Farhat, Maen A. “Structural Behavior of Full Scale Totally Precast Concrete Counterfort Retaining Wall System.” 2016. Thesis, University of Illinois – Chicago. Accessed January 21, 2021. http://hdl.handle.net/10027/21631.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Farhat, Maen A. “Structural Behavior of Full Scale Totally Precast Concrete Counterfort Retaining Wall System.” 2016. Web. 21 Jan 2021.

Vancouver:

Farhat MA. Structural Behavior of Full Scale Totally Precast Concrete Counterfort Retaining Wall System. [Internet] [Thesis]. University of Illinois – Chicago; 2016. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/10027/21631.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Farhat MA. Structural Behavior of Full Scale Totally Precast Concrete Counterfort Retaining Wall System. [Thesis]. University of Illinois – Chicago; 2016. Available from: http://hdl.handle.net/10027/21631

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Open Access Theses and Dissertations