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1.
Shaik, Khadar Vali.
Impact testing of advanced ceramic composites using
experimental and F E analysis.
Degree: 2010, Jawaharlal Nehru Technological University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/2680 
► The increasing use of advanced Ceramic Composites in Aircrafts, Automobiles, Missile Systems and Space Structures has been well documented and continuously receiving the wide attention…
(more)
▼ The increasing use of advanced Ceramic Composites
in Aircrafts, Automobiles, Missile Systems and Space Structures has
been well documented and continuously receiving the wide attention
of industry. The structural engineer needs to be familiar with the
property of the composite material structures. The behavior of
ceramic composite material under impact load plays a pivotal role
in designing such structures. An impact test is a test for
determining the energy absorbed in fracturing a test piece at high
velocity. The impact resistance of a part is, in many applications,
a critical measure of service life. In the current work, an attempt
is made to present the dynamic behavior of the advanced ceramic
composite material, i.e., 3 Dimensional Carbon-Silicon Carbide (3D
C-SiC) under the impact, tensile and flexure loads and the
mechanical properties, viz., Impact Strength, Tensile Strength and
Flexural Strength are determined. In 3Dimensional Geometric
Modeling, the spatial orientation of the yarn is explained and the
geometric parameters are estimated. 3D C-SiC composite specimens
with a fiber volume fraction of 40% are prepared by Liquid Silicon
Infiltration (LSI) process to 3 conduct the required experiments
for evaluating the mechanical properties. The experimental results
of impact, tensile, flexure and shear strengths recorded during the
tests are 26.82 kJ/m2, 70.2 MPa, 230.3 MPa and 30.5 MPa
respectively. Computer simulations by using ANSYS 11.0 software
gave very consistent results with a variation of approximately 1-4
% which can be considered as an acceptable range.
Abstract includes, Reference
p.110-122
Subjects/Keywords: Woven fiber; 3D Carbon fiber
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APA (6th Edition):
Shaik, K. V. (2010). Impact testing of advanced ceramic composites using
experimental and F E analysis. (Thesis). Jawaharlal Nehru Technological University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/2680
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Shaik, Khadar Vali. “Impact testing of advanced ceramic composites using
experimental and F E analysis.” 2010. Thesis, Jawaharlal Nehru Technological University. Accessed February 27, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/2680.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Shaik, Khadar Vali. “Impact testing of advanced ceramic composites using
experimental and F E analysis.” 2010. Web. 27 Feb 2021.
Vancouver:
Shaik KV. Impact testing of advanced ceramic composites using
experimental and F E analysis. [Internet] [Thesis]. Jawaharlal Nehru Technological University; 2010. [cited 2021 Feb 27].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/2680.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Shaik KV. Impact testing of advanced ceramic composites using
experimental and F E analysis. [Thesis]. Jawaharlal Nehru Technological University; 2010. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/2680
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Georgia Tech
2.
Newcomb, Bradley Allen.
Gel spun PAN and PAN/CNT based carbon fibers: From viscoelastic solution to elastic fiber.
Degree: PhD, Materials Science and Engineering, 2015, Georgia Tech
URL: http://hdl.handle.net/1853/54881
► This study focuses on the processing, structure, and properties of gel spun polyacrylonitrile (PAN) and polyacrylonitrile/carbon nanotube (PAN/CNT) carbon fibers. Gel spun PAN based carbon…
(more)
▼ This study focuses on the processing, structure, and properties of gel spun polyacrylonitrile (PAN) and polyacrylonitrile/
carbon nanotube (PAN/CNT)
carbon fibers. Gel spun PAN based
carbon fibers are manufactured beginning with a study of PAN dissolution in an organic solvent (dimethylformamide, DMF). Homogeneity of the PAN/DMF solution is determined through dynamic shear rheology, and the slope of the Han Plot (log G’ vs log G’’). Solutions were then extruded into gel spun fibers using a 100 filament
fiber spinning apparatus in a class 1000 cleanroom. Fibers were then subjected to
fiber drawing, stabilization, and carbonization, to convert the PAN precursor
fiber into
carbon fiber.
Carbon fiber tensile strength was shown to scale with the homogeneity of the PAN/DMF solution, as determined by the slope of the log G’ vs log G’’ plot. After the development of the understanding between the homogeneity of the PAN/DMF solutions on the gel spun PAN based
carbon fiber tensile properties, the effect of altering the
fiber spinning processing conditions on the gel spun PAN based
carbon fiber structure and properties is pursued. Cross-sectional shape of the gel spun PAN precursor
fiber, characterized with a stereomicroscope, was found to become more circular in cross-section as the gelation bath temperature was increased, the amount of solvent in the gelation bath was increased, and when the solvent was switched from DMF to dimethylacetamide (DMAc). Gel spun fibers were then subjected to
fiber drawing, stabilization, and carbonization to manufacture the
carbon fiber.
Carbon fibers were characterized to determine single filament tensile properties and
fiber structure using wide-angle x-ray diffraction (WAXD) and high resolution transmission electron microscopy (HRTEM). It was found that the
carbon fiber tensile properties decreased as the
carbon fiber circularity increased, as a result of the differences in microstructure of the
carbon fiber that result from differences in
fiber spinning conditions. In the second half of this study, the addition of CNT into the PAN precursor and
carbon fiber is investigated. CNT addition occurs during the solution processing phase, prior to gel spinning. As a first study, Raman spectroscopy is employed to investigate the bundling behavior of the CNT after gel spinning and drawing of the PAN/CNT fibers. By monitoring the peak intensity of the (12,1) chirality in the as-received CNT powder, and in differently processed PAN/CNT fibers, the quality of CNT dispersion can be quickly monitored. PAN/CNT fibers were then
subject to single filament straining, with Raman spectra collected as a function of PAN/CNT filament strain. As a result of the PAN/CNT strain, stress induced G’ Raman band shifts were observed in the CNT, indicating successful stress transfer from the surrounding PAN matrix to the dispersed CNT. Utilization of the shear lag theory allows for the calculation of the interfacial shear strength between the PAN and incorporated CNT, which is found to increase as the quality of CNT (higher…
Advisors/Committee Members: Kumar, Satish (advisor), Griffin, Anselm (committee member), Shofner, Meisha (committee member), Yao, Donggang (committee member), Zhang, Chuck (committee member).
Subjects/Keywords: Carbon fiber; Carbon nanotubes
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APA (6th Edition):
Newcomb, B. A. (2015). Gel spun PAN and PAN/CNT based carbon fibers: From viscoelastic solution to elastic fiber. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/54881
Chicago Manual of Style (16th Edition):
Newcomb, Bradley Allen. “Gel spun PAN and PAN/CNT based carbon fibers: From viscoelastic solution to elastic fiber.” 2015. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/54881.
MLA Handbook (7th Edition):
Newcomb, Bradley Allen. “Gel spun PAN and PAN/CNT based carbon fibers: From viscoelastic solution to elastic fiber.” 2015. Web. 27 Feb 2021.
Vancouver:
Newcomb BA. Gel spun PAN and PAN/CNT based carbon fibers: From viscoelastic solution to elastic fiber. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/54881.
Council of Science Editors:
Newcomb BA. Gel spun PAN and PAN/CNT based carbon fibers: From viscoelastic solution to elastic fiber. [Doctoral Dissertation]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/54881
Brandeis University
3.
Hayashi, Lauren.
Improved Methodology for the Construction of Carbon Fiber Multi-Electrode Arrays.
Degree: 2020, Brandeis University
URL: http://hdl.handle.net/10192/37514
► Carbon fibers are an ideal material for constructing multi-channel extracellular recording arrays. We have been working to construct 16-channel carbon fiber electrodes to record the…
(more)
▼ Carbon fibers are an ideal material for constructing multi-channel extracellular recording arrays. We have been working to construct 16-channel carbon fiber electrodes to record the activity of cells in the ferret LGN. An impedance below 4 MΩ was used as the standard for success. At the start of the process, very few channels met this goal. We implemented new methods for constructing and testing electrodes, and our success rate was brought up to an average of 83% (13 out of 16 channels in 19 electrodes). The new methods include an updated jig design, an improved silver-printing procedure, and the addition of a gold electroplating step to treat the recording tips of the carbon fibers. The electrodes constructed with the revised methods have been used to record from ferret V1 cortex, and have shown recorded spike amplitudes ranging from -150 to -300 V. These results confirm the capability of our carbon fiber electrodes to record neural activity. Our construction methods provide a solid foundation that equips the lab to make future adjustments to meet the goal of producing electrodes with a higher density of carbon fibers and with the necessary robustness to record in deeper brain regions like the LGN.
Subjects/Keywords: Carbon Fiber Electrodes
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APA (6th Edition):
Hayashi, L. (2020). Improved Methodology for the Construction of Carbon Fiber Multi-Electrode Arrays. (Thesis). Brandeis University. Retrieved from http://hdl.handle.net/10192/37514
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hayashi, Lauren. “Improved Methodology for the Construction of Carbon Fiber Multi-Electrode Arrays.” 2020. Thesis, Brandeis University. Accessed February 27, 2021.
http://hdl.handle.net/10192/37514.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hayashi, Lauren. “Improved Methodology for the Construction of Carbon Fiber Multi-Electrode Arrays.” 2020. Web. 27 Feb 2021.
Vancouver:
Hayashi L. Improved Methodology for the Construction of Carbon Fiber Multi-Electrode Arrays. [Internet] [Thesis]. Brandeis University; 2020. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10192/37514.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hayashi L. Improved Methodology for the Construction of Carbon Fiber Multi-Electrode Arrays. [Thesis]. Brandeis University; 2020. Available from: http://hdl.handle.net/10192/37514
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
IUPUI
4.
Deshpande, Archit M.
Numerical Modelling and Experimental Investigation of CFRP Structures for Large Deformations.
Degree: 2019, IUPUI
URL: http://hdl.handle.net/1805/19976
► Indiana University-Purdue University Indianapolis (IUPUI)
The use of carbon-fiber reinforced composite materials is not novel in the field of motorsports industry. Their use in collapsible…
(more)
▼ Indiana University-Purdue University Indianapolis (IUPUI)
The use of carbon-fiber reinforced composite materials is not novel in the field
of motorsports industry. Their use in collapsible structures for crashworthiness is
however not fully understood and predicted. Due to the complex failure mechanisms
occurring within the material, the energy absorbing capacity cannot be easily pre
dicted. The need to understand their contributions in crashworthy structures is thus
of great importance. Furthermore, failure of carbon-fiber composites is highly depen
dent on the geometry of structure. Problems arise in both experimental and numerical
modelling of these structures. Although many explicit FEA codes exist, they often
include experimental parameters that need to be calibrated through either coupon
tests or actual crash tests. As composite structures become more commonly used in
automotive industry, it is necessary to set some guidelines to successfully model and
simulate composite crashworthy structures.
The numerical modelling was done in LS-DYNA Enhanced composite damage
MAT54. The material properties were configured using experimental coupon tests.
The tests were conducted on square composite tubes. The Specific Energy Absorption
(SEA) of the tubes were calculated through several coupons. As SEA is a function of
geometry, it was necessary to conduct tests with similar geometry as seen in nosecone.
MAT54 was chosen to simulate both crush and crash simulations due to its capability
to simulate element level crushing. Furthermore, various modifications within the
material model, improve its accuracy to determine composite failure.
The research utilizes the characterization of material inputs in MAT54 by con
ducting quasi-static compression tests on simpler but similar geometry. By utilizing
inputs, a zonal optimization was conducted on the nosecone geometry. The number of
layers, layer orientations and ply thicknesses were varied to vary the energy absorbed
per zone. The deceleration of the vehicle can thus be controlled, and the weight of
the structure could be reduced.
Advisors/Committee Members: Dalir, Hamid, Agarwal, Mangilal, Tovar, Andres.
Subjects/Keywords: carbon fiber; motorsports; LS-DYNA
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APA (6th Edition):
Deshpande, A. M. (2019). Numerical Modelling and Experimental Investigation of CFRP Structures for Large Deformations. (Thesis). IUPUI. Retrieved from http://hdl.handle.net/1805/19976
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Deshpande, Archit M. “Numerical Modelling and Experimental Investigation of CFRP Structures for Large Deformations.” 2019. Thesis, IUPUI. Accessed February 27, 2021.
http://hdl.handle.net/1805/19976.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Deshpande, Archit M. “Numerical Modelling and Experimental Investigation of CFRP Structures for Large Deformations.” 2019. Web. 27 Feb 2021.
Vancouver:
Deshpande AM. Numerical Modelling and Experimental Investigation of CFRP Structures for Large Deformations. [Internet] [Thesis]. IUPUI; 2019. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1805/19976.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Deshpande AM. Numerical Modelling and Experimental Investigation of CFRP Structures for Large Deformations. [Thesis]. IUPUI; 2019. Available from: http://hdl.handle.net/1805/19976
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
5.
Renard, Stephen (author).
Carbon Valley.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:6c53991c-ea8f-4dd0-a67b-d45d2cd9cfa2
► This project will house the next generation of technology and startups. The design will reflect what is held on the inside through a computational design…
(more)
▼ This project will house the next generation of technology and startups. The design will reflect what is held on the inside through a computational design strategy progressing nonstandard architecture. The site will first be analyzed in terms of people flow, (where people come from, where they are most likely to go, where they are most likely to stay, etc) solar, wind and climate analysis, along with the local, visual and physical connections. These inputs will be used to define the boundary of the building within the site. They will also be used to define certain parameters of the building itself, such as heights, views, certain directions of structure, etc. Once the boundary is created, the program is determined and placed on the site. The overall design and form will be derived from spatial analysis of the required program. This will start with the analysis of what functions are required in a multi use tech exhibition and startup center. Once the programs and functions are taken into account, the analysis of the spaces, functions and uses will be cross referenced and tagged in order to determine which spaces need to be close to each other and which ones can be farther away. This will be accomplished through a script that places the individual programmatic spaces within the boundary in close proximity to other spaces that are required to be close. Once these spaces are defined and the areas are set, swarm logic, people flow simulation and environmental factors will shape the form and connect the spaces. The swarm logic will start from specific areas on the site where people can enter and connect the ground to the building and interior spaces. The autonomous agents will create a trail that will define other architectural elements critical to the design of the center. These would include public/ semi public spaces that lead the visitor into the building. People flow analysis will be used to create the internal flows of people in the tech and exhibition center as well as the external to internal flows and vice versa. The wind analysis will help to streamline the form so that the wind will not create extra stresses across the building, rather flow along the structure. The environment, climate and other factors will be taken in to account in order to create a low impact building that concentrates on performance driven aspects, revolving around and showcasing the tech industry. In the micro/meso scale, the buildings skin and construction components will be explored to derive a new way to use
Carbon Fiber (or composites) in the construction field. This part will fall under the category of Design to Robotic Production. The goal for this portion is to explore and create a self supported or minimally supported
carbon fiber structure (or composite structure) that would integrate the systems, structure and aesthetics into the building pieces. Through the use of programming and biomimicry, the composites would be designed in a way that is structurally sound, aesthetically pleasing and performance oriented. The design of…
Advisors/Committee Members: Bier, Henriette (mentor), Vollers, Karel (mentor), Trienekens, Otto (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: carbon fiber; parametric design; Architecture
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APA (6th Edition):
Renard, S. (. (2017). Carbon Valley. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:6c53991c-ea8f-4dd0-a67b-d45d2cd9cfa2
Chicago Manual of Style (16th Edition):
Renard, Stephen (author). “Carbon Valley.” 2017. Masters Thesis, Delft University of Technology. Accessed February 27, 2021.
http://resolver.tudelft.nl/uuid:6c53991c-ea8f-4dd0-a67b-d45d2cd9cfa2.
MLA Handbook (7th Edition):
Renard, Stephen (author). “Carbon Valley.” 2017. Web. 27 Feb 2021.
Vancouver:
Renard S(. Carbon Valley. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Feb 27].
Available from: http://resolver.tudelft.nl/uuid:6c53991c-ea8f-4dd0-a67b-d45d2cd9cfa2.
Council of Science Editors:
Renard S(. Carbon Valley. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:6c53991c-ea8f-4dd0-a67b-d45d2cd9cfa2
Delft University of Technology
6.
Huisman, Niek (author).
Fiber optimization of a carbon windsurfing boom: FEM fiber optimization for mass and stiffness.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:0e99cbcc-3497-4a34-887f-9c8370dd5870
► The goal of this research is to optimize the fiber layup of a carbon windsurfing boom for weight and stiffness. A windsurfing boom should be…
(more)
▼ The goal of this research is to optimize the
fiber layup of a
carbon windsurfing boom for weight and stiffness. A windsurfing boom should be stiff to provide an efficient basis for the energy transfer from the sail through the surfer to the board. The weight of the boom is important as the total weight of the rig influences the performance, especially during movements where the swing weight of the rig is important. To optimize the
fiber layup the FEM simulation software of SolidWorks is used. This software allows the user to divide the part in sections and specify the layup per section in terms of orientation, thickness, and material. The output of the FEM simulation is the mass and the displacement under different load cases. The load cases are based on an experiment where the loads during sailing are determined with load cells and strain gauges. The FEM simulation is validated and scaled based on two experimentally determined force-displacement relations. The FEM is scaled with the force-displacement relation of the first loading point by scaling the given material parameters by 0.78. The FEM is then validated with the force-displacement relation of the second loading point. New
fiber layups are generated based on stress direction, previous iterations, and engineering intuition. The 50 new generated layups and their respective mass and displacement results are evaluated with a performance equation to determine which layup has the highest performance for the combination of mass and displacement. The coefficients in the performance equation are chosen so that both parameters have equal weight. The chosen layup is further evaluated with a required
fiber overlap section. Two booms with the new layup are evaluated with the same experiment that is used to validate and scale the original FEM. At the first loading point, where the main loading during sailing is applied, the new layup is 16 percent stiffer than the original layup, as predicted by the FEM. The experiment results for the second loading point showed that the new layup was 5.5-7.5 percent stiffer than the original layup instead of the predicted 13 percent. This difference is due to the straight tubes that are glued to the end of the optimized boom body which are made by a different manufacturer. Changing the stiffness of these pipes makes the FEM results converge to the experimentally determined values. The experiment results of both layups are evaluated with the performance equation as the stiffness has increased but the mass has increased from 2.19 to 2.25 kg as well. The performance equation showed that the new layup outperforms the original layup for both loading points. The project goal to optimize the layup for mass and stiffness is therefore achieved. For the layup of the boom, a sandwiched layup of unidirectional fibers with biaxial fibers at the in- and outside of the circular cross-section was determined as the best performing layup for the sections loaded under bending. For sections that are loaded under both torsion and bending additional…
Advisors/Committee Members: Keijdener, Chris (mentor), Metrikine, Andrei (graduation committee), Pavlovic, Marko (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: FEM analysis; optimization; carbon fiber
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APA (6th Edition):
Huisman, N. (. (2019). Fiber optimization of a carbon windsurfing boom: FEM fiber optimization for mass and stiffness. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:0e99cbcc-3497-4a34-887f-9c8370dd5870
Chicago Manual of Style (16th Edition):
Huisman, Niek (author). “Fiber optimization of a carbon windsurfing boom: FEM fiber optimization for mass and stiffness.” 2019. Masters Thesis, Delft University of Technology. Accessed February 27, 2021.
http://resolver.tudelft.nl/uuid:0e99cbcc-3497-4a34-887f-9c8370dd5870.
MLA Handbook (7th Edition):
Huisman, Niek (author). “Fiber optimization of a carbon windsurfing boom: FEM fiber optimization for mass and stiffness.” 2019. Web. 27 Feb 2021.
Vancouver:
Huisman N(. Fiber optimization of a carbon windsurfing boom: FEM fiber optimization for mass and stiffness. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Feb 27].
Available from: http://resolver.tudelft.nl/uuid:0e99cbcc-3497-4a34-887f-9c8370dd5870.
Council of Science Editors:
Huisman N(. Fiber optimization of a carbon windsurfing boom: FEM fiber optimization for mass and stiffness. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:0e99cbcc-3497-4a34-887f-9c8370dd5870
Virginia Tech
7.
Miller, Gregory Charles Jr.
Melt Processable Poly(acrylonitrile)-based Precursors for Carbon Fiber Production and Advanced Polymeric Membranes for Gas Separation and Water Electrolysis Applications.
Degree: PhD, Macromolecular Science and Engineering, 2017, Virginia Tech
URL: http://hdl.handle.net/10919/86226
► An effort concerned with the feasibility of achieving melt-processable polyacrylonitrile copolymer system precursors for producing high modulus carbon fibers is detailed. High molecular weight poly(acrylonitrile-ran-methyl…
(more)
▼ An effort concerned with the feasibility of achieving melt-processable polyacrylonitrile copolymer system precursors for producing high modulus
carbon fibers is detailed. High molecular weight poly(acrylonitrile-ran-methyl acrylate) (PAN-MA) copolymer with high acrylonitrile content were mixed with various water containing binary melting point modifiers to produce systems that formed stable melts at temperatures below the temperature corresponding to the onset of PAN-MA crosslinking. The structure of the copolymer was found to be 96.5 ± 0.13 mole % acrylonitrile and 4.40 ± 0.13 mole % methyl acrylate by 1H-NMR with an Mw ]= 238 kDa and dispersity of 1.9 determined by size exclusion chromatography. A reduction in the Tm of the copolymer of 200 C was established for a copolymer/melting point modifier system containing copolymer mixed with water and acetonitrile with the following composition: PAN-MA/ACN/H2O 55/25/20 wt:wt:wt. This corresponds to the greatest reduction in a PAN-based copolymer melting temperature yet reported. From isothermal DSC and pressurized capillary rheometry experiments it was found that the stability of the resulting melts shows a strong temperature dependence, but does not show a strong dependence on shear rate. Copolymer mixtures with H2O and acetonitrile or H2O and adiponitrile were found to be suitable for melt-extrusion at 170 C with viscosities ranging from 1800-2000 Pa*s with stabilities greater than 1 hour.
The modification of membranes to improve gas separation properties is of considerable interest. Crosslinking is one route to modify membranes, but the resulting effects on thin membranes have yet to be investigated to understand the impact of such modification at thicknesses that are relevant to industrial membranes. In this study, the influences of UV irradiation and physical aging on O2 and N2 gas permeation properties of thin (~ 150 nm) glassy poly(arylene ether ketone) (PAEK) films at 35 C and 2 atm were investigated. Thin PAEK films prepared from tetramethyl bisphenol A and 4,4'-difluorobenzophenone were UV irradiated on both sides in air or N2 at wavelengths of 254 nm or 365 nm. This induced crosslinking and, in some cases, photooxidation. Gas permeability decreased and O2/N2 selectivity increased as UV irradiation and aging time were increased. At 254 nm, samples irradiated in air had lower permeability coefficients and higher selectivities than samples irradiated in N2, and this was ascribed to additional decreases in free volume due to photooxidation in air-irradiated samples. Additionally, air-irradiated samples at 254 nm exhibited less physical aging than non-crosslinked and N2-irradiated samples at 254 nm, possibly due to interactions among photooxidative polar products that may restrict polymer chain mobility, thereby lowering the aging rate. The influence of water vapor on physical aging of air-irradiated samples was examined. Finally, irradiation at 254 nm leads to more extensive crosslinking and/or photooxidation than irradiation at 365 nm, possibly due to…
Advisors/Committee Members: Riffle, Judy S. (committeechair), Turner, S. Richard (committee member), Mecham, Beverly S. (committee member), Moore, Robert Bowen (committee member), Davis, Richey M. (committee member).
Subjects/Keywords: Carbon Fiber; Polyacrylonitrile; Melt-processing
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APA (6th Edition):
Miller, G. C. J. (2017). Melt Processable Poly(acrylonitrile)-based Precursors for Carbon Fiber Production and Advanced Polymeric Membranes for Gas Separation and Water Electrolysis Applications. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/86226
Chicago Manual of Style (16th Edition):
Miller, Gregory Charles Jr. “Melt Processable Poly(acrylonitrile)-based Precursors for Carbon Fiber Production and Advanced Polymeric Membranes for Gas Separation and Water Electrolysis Applications.” 2017. Doctoral Dissertation, Virginia Tech. Accessed February 27, 2021.
http://hdl.handle.net/10919/86226.
MLA Handbook (7th Edition):
Miller, Gregory Charles Jr. “Melt Processable Poly(acrylonitrile)-based Precursors for Carbon Fiber Production and Advanced Polymeric Membranes for Gas Separation and Water Electrolysis Applications.” 2017. Web. 27 Feb 2021.
Vancouver:
Miller GCJ. Melt Processable Poly(acrylonitrile)-based Precursors for Carbon Fiber Production and Advanced Polymeric Membranes for Gas Separation and Water Electrolysis Applications. [Internet] [Doctoral dissertation]. Virginia Tech; 2017. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10919/86226.
Council of Science Editors:
Miller GCJ. Melt Processable Poly(acrylonitrile)-based Precursors for Carbon Fiber Production and Advanced Polymeric Membranes for Gas Separation and Water Electrolysis Applications. [Doctoral Dissertation]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/86226
University of Sydney
8.
Jiang, Lin.
The Preparation of a Carbon Fibre Hybrid with Improved Thermal Stability
.
Degree: 2019, University of Sydney
URL: http://hdl.handle.net/2123/20718
► Carbon fibre has unique mechanical properties such as low density, high strength and high modulus even at high temperatures. However, since carbon fibre is composed…
(more)
▼ Carbon fibre has unique mechanical properties such as low density, high strength and high modulus even at high temperatures. However, since carbon fibre is composed of pure carbon, the oxidation temperature starts from 350 °C, which limited the usage. To solve this problem, this thesis uses an environmentally friendly and efficient electrodeposition method to prepare a uniform anti-oxidation coating, to isolate oxygen and fibre, and significantly improve the use temperature of carbon fibre. However, carbon fibre without surface treatment cannot meet the requirements of electrodeposition. The coating balance leads to a part of carbon fibre still explored after the treatment. Therefore, a new two-step method was applied to graft carbon nanofibres (CNFs) on the carbon fibre surface to break the balance for antioxidation coating cover the entire fibre surface. The effect of carbon fibre mechanics during grafting process has discussed. The strength of the fibre with three different catalysts after heat treatment and the role of the catalyst particles during the processing were discussed. CNFs, carbon nanotubes (CNTs) and onion structures carbon were grown on fibre surfaces with different catalysts. The CNFs and CNTs were grafted on the fibre surface with a stronger interface to enhance fibre surface roughness for carbon fibre further process. The conditions of electrodeposited silica and determined the best electrodeposition conditions for this grafted carbon fibre. The oxidation temperature of carbon fibre with the coating is up to 600°C. This new carbon fibre grafting method not only provides a practical solution for carbon fibres’ electroplate the antioxidation coating but also provides a new platform for the carbon fibre modification.
Subjects/Keywords: Carbon fiber;
Stability;
Electroplating
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APA (6th Edition):
Jiang, L. (2019). The Preparation of a Carbon Fibre Hybrid with Improved Thermal Stability
. (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/20718
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Jiang, Lin. “The Preparation of a Carbon Fibre Hybrid with Improved Thermal Stability
.” 2019. Thesis, University of Sydney. Accessed February 27, 2021.
http://hdl.handle.net/2123/20718.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Jiang, Lin. “The Preparation of a Carbon Fibre Hybrid with Improved Thermal Stability
.” 2019. Web. 27 Feb 2021.
Vancouver:
Jiang L. The Preparation of a Carbon Fibre Hybrid with Improved Thermal Stability
. [Internet] [Thesis]. University of Sydney; 2019. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2123/20718.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Jiang L. The Preparation of a Carbon Fibre Hybrid with Improved Thermal Stability
. [Thesis]. University of Sydney; 2019. Available from: http://hdl.handle.net/2123/20718
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Oklahoma State University
9.
Dasgupta, Suman.
Characterization of Adhesion at Carbon Fiber-fluorinated Epoxy Interface and Effect of Environmental Degradation.
Degree: Mechanical & Aerospace Engineering, 2011, Oklahoma State University
URL: http://hdl.handle.net/11244/9919
► Carbon fiber reinforced polymers are excellent candidates for aerospace, automobile and other mobile applications due to their high specific strength and modulus. The most prominent…
(more)
▼ Carbon fiber reinforced polymers are excellent candidates for aerospace, automobile and other mobile applications due to their high specific strength and modulus. The most prominent aerospace application of
carbon fiber composites in recent times is the Boeing 787 Dreamliner, which is the world's first major commercial airliner to extensively use composite materials. The critical issue, which needs to be addressed hereby, is long-term safety. Hence, long-term durability of composite materials in such applications becomes a point of concern. Conventional polymer matrices, such as thermosetting resins, which are used as matrix material in
carbon fiber composites, are susceptible to degradation in the form of chemical corrosion, UV degradation and moisture, in severe environmental conditions. Fluorinated polymers offer a viable alternative as matrix material, due to their reduced susceptibility to environmental degradation. The epoxy system used in this study is fluorinated Tetra-glycidyl methylene di-aniline (6F-TGMDA), which was developed by polymer scientists at NASA Langley Research Center. The hydrophobic nature of this epoxy makes it a potential matrix material in aerospace applications. However, its compatibility in
carbon fiber-reinforced composites remains to be investigated. This study aims to characterize the interfacial properties in
carbon fiber reinforced fluorinated epoxy composites. Typical interfacial characterization parameters, like interfacial shear strength, estimated from the microbond test, proved to be inadequate in accurately estimating adhesion since it assumes a uniform distribution of stresses along the embedded
fiber length. Also, it does not account for any residual stresses present at the interface, which might arise due to thermal expansion differences and Poisson's ratio differences of the
fiber and matrix. Hence, an analytical approach, which calculates adhesion pressure at the interface, was adopted. This required determination of the unknown mechanical and physical properties of the resin, the relaxation modulus (determined using nano-indentation) and coefficient of thermal expansion (determined using coherent gradient sensing). The adhesional pressure for 6F TGMDA-
carbon fiber interface was found to be 135.48 MPa compared to 138.47 MPa for the Diamino diphenyl sulphone (DDS) cured TGMDA-
carbon fiber interface. The fact that the adhesional pressure does not show significant decrease upon fluorination of the epoxy system is an advantage. The hydrophobicity of fluorine can be utilized to manufacture environmentally resistant composites while keeping the level of interfacial adhesion the same as in the case of conventional epoxy system, DDS cured TGMDA.
Advisors/Committee Members: Singh, Raman P. (advisor), Kalkan, A. Kaan (committee member), Ausman, Kevin Douglas (committee member).
Subjects/Keywords: carbon fiber; fluorinated epoxy; interface
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APA (6th Edition):
Dasgupta, S. (2011). Characterization of Adhesion at Carbon Fiber-fluorinated Epoxy Interface and Effect of Environmental Degradation. (Thesis). Oklahoma State University. Retrieved from http://hdl.handle.net/11244/9919
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Dasgupta, Suman. “Characterization of Adhesion at Carbon Fiber-fluorinated Epoxy Interface and Effect of Environmental Degradation.” 2011. Thesis, Oklahoma State University. Accessed February 27, 2021.
http://hdl.handle.net/11244/9919.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Dasgupta, Suman. “Characterization of Adhesion at Carbon Fiber-fluorinated Epoxy Interface and Effect of Environmental Degradation.” 2011. Web. 27 Feb 2021.
Vancouver:
Dasgupta S. Characterization of Adhesion at Carbon Fiber-fluorinated Epoxy Interface and Effect of Environmental Degradation. [Internet] [Thesis]. Oklahoma State University; 2011. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/11244/9919.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Dasgupta S. Characterization of Adhesion at Carbon Fiber-fluorinated Epoxy Interface and Effect of Environmental Degradation. [Thesis]. Oklahoma State University; 2011. Available from: http://hdl.handle.net/11244/9919
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
10.
Varischetti, Joshua Allen.
Mechanical Damping Properties of Carbon Nanofiber Reinforced Composites.
Degree: 2012, University of Nevada – Reno
URL: http://hdl.handle.net/11714/3771
► In this research an investigation of the damping enhancement achieved, utilizing carbon nano fibers (CNF) to epoxy resin is presented along with a corresponding model…
(more)
▼ In this research an investigation of the damping enhancement achieved, utilizing
carbon nano fibers (CNF) to epoxy resin is presented along with a corresponding model to predict damping performance. The addition of CNF fillers to the matrix allows for localized slip between the filler and the matrix on a nanoscale, wherein the matrix can de-bond from the CNFs, allowing the fillers to slip relative to the matrix; thereby, dissipating energy as frictional heat. Due to the nanoscale size of the filler, the specific surface area, of the CNF's, is very large when compared to traditional
fiber reinforcement, this attribute allows small fractions of CNF fillers to have a large impact on the structural damping without any significant weight penalties. Moreover, once the composite returns to its undeformed configuration the interface between nano fillers and matrix will then re-establish the Van der Waals interactions that were broken to allow the slip. Thus, localized yet recoverable, frictional slip at the nano scale can be employed to significantly enhance strain dependent damping in composite structures wherein no permanent structural damage is evidenced. To better understand the damping response in CNF reinforced composites this study utilizes experimental and analytical approaches to develop modeling techniques that account for various fundamental attributes of high aspect ratio fillers, specifically the effect of filler aspect ratio, filler waviness, filler orientation relative to loading direction and the effect of multiple fillers on the damping performance and investigated in detail and corresponding modeling techniques are developed to address each of these factors in order to better predict the viscoelastic response of CNF reinforced composites. These models will be beneficial to address composite design while accounting for makeup, constituent properties, filler geometries, filler orientations, and their effective role in damping performance.
Advisors/Committee Members: Suhr, Jonghwan (advisor), Gibson, Ronald (committee member), Luo, Shen-yi (committee member), Shen, Yanto (committee member), Li, Qizhen (committee member).
Subjects/Keywords: Carbon Nano FIber; Damping; Viscoelasticity
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APA (6th Edition):
Varischetti, J. A. (2012). Mechanical Damping Properties of Carbon Nanofiber Reinforced Composites. (Thesis). University of Nevada – Reno. Retrieved from http://hdl.handle.net/11714/3771
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Varischetti, Joshua Allen. “Mechanical Damping Properties of Carbon Nanofiber Reinforced Composites.” 2012. Thesis, University of Nevada – Reno. Accessed February 27, 2021.
http://hdl.handle.net/11714/3771.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Varischetti, Joshua Allen. “Mechanical Damping Properties of Carbon Nanofiber Reinforced Composites.” 2012. Web. 27 Feb 2021.
Vancouver:
Varischetti JA. Mechanical Damping Properties of Carbon Nanofiber Reinforced Composites. [Internet] [Thesis]. University of Nevada – Reno; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/11714/3771.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Varischetti JA. Mechanical Damping Properties of Carbon Nanofiber Reinforced Composites. [Thesis]. University of Nevada – Reno; 2012. Available from: http://hdl.handle.net/11714/3771
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Rice University
11.
Jiang, Chengmin.
Carbon Nanotubides: an Alternative for Dispersion, Functionalization and Composites Fabrication.
Degree: PhD, Natural Sciences, 2016, Rice University
URL: http://hdl.handle.net/1911/96257
► Negatively charged single-walled carbon nanotube (SWCNT), also called SWCNT polyelectrolytes and single-walled carbon nanotubides (SWCNTDs), are formed by the reduction (either chemical or electrochemical) of…
(more)
▼ Negatively charged single-walled
carbon nanotube (SWCNT), also called SWCNT polyelectrolytes and single-walled
carbon nanotubides (SWCNTDs), are formed by the reduction (either chemical or electrochemical) of the SWCNT wall by alkali metals (or an electrode) to form negative charged SWCNTs surrounded by an alkali metal counter ions. SWCNT polyelectrolytes can spontaneously dissolve in a variety of polar aprotic solvents without assistance of sonication and will readily react with alkyls and aryls halides to functionalize the walls of SWCNTs.
Although SWCNT polyelectrolytes present a good alternative for achieving high concentration of SWCNTs in solution, the condensation of the counter ions on the surface of negatively charged SWCNTs partially shield their charge, limiting the solubility of SWCNT polyelectrolytes. For HiPco SWCNT polyelectrolytes, the highest solubility reported before this work was only 0.4 mg/mL in DMSO. However, we developed a method that greatly improve the solubility of SWCNTs by adding crown ether into the system to coordinate the potassium cation and thus separate the negatively charged SWCNTs from counter ions. This new method produces a high concentration of SWCNT polyelectrolytes up to 9.2 mg/mL in DMSO. In addition, we were able to observe the formation of liquid crystalline phases at highly concentrated solutions, which has been proved to be an essential factor for manufacturing highly ordered robust macroscopic materials. After applying a more efficient dispersion method, speed-mixing, the concentration of SWCNT polyelectrolytes can be further improved up to 52 mg/mL. Compared with previous reported results, the increase in solubility is more than 100 times.
As mentioned above, we achieved high concentration of SWCNT polyelectrolytes by adding crown ether to the mixture and using speed-mixing. The SWCNTs in these solutions spontaneously align forming liquid crystalline solutions that can be manufactured into strong and conductive
carbon nanotubes fibers by spinning the SWCNT dispersions into aqueous coagulation solutions. The best fibers we have obtained by this method have tensile strength up to 124 MPa, which compares to HiPco SWCNT fibers spun from superacid solutions, and conductivity 2 × 104 S/m. Our method provides an acid-free alternative towards high performance
carbon nanotube fibers, which can be expanded for the production of other materials such as films. Also, we expanded our methodology to disperse graphite intercalation compounds (GICs) into graphene polyelectrolytes. Graphene polyelectrolytes, when mixed with SWCNT polyelectrolytes were spun onto SWCNT/Graphene hybrid fibers, which maintains a similar tensile strength (as for HiPco SWCNT fibers) while the Young’s modulus increases by 70% and conductivity increases 2 times.
Advisors/Committee Members: Marti, Angel A. (advisor), Pasquali, Matteo (advisor), Wilson, Lon J. (advisor).
Subjects/Keywords: Carbon Nanotubide; Carbon Nanotube Fiber; Graphenide
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APA ·
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CSE |
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APA (6th Edition):
Jiang, C. (2016). Carbon Nanotubides: an Alternative for Dispersion, Functionalization and Composites Fabrication. (Doctoral Dissertation). Rice University. Retrieved from http://hdl.handle.net/1911/96257
Chicago Manual of Style (16th Edition):
Jiang, Chengmin. “Carbon Nanotubides: an Alternative for Dispersion, Functionalization and Composites Fabrication.” 2016. Doctoral Dissertation, Rice University. Accessed February 27, 2021.
http://hdl.handle.net/1911/96257.
MLA Handbook (7th Edition):
Jiang, Chengmin. “Carbon Nanotubides: an Alternative for Dispersion, Functionalization and Composites Fabrication.” 2016. Web. 27 Feb 2021.
Vancouver:
Jiang C. Carbon Nanotubides: an Alternative for Dispersion, Functionalization and Composites Fabrication. [Internet] [Doctoral dissertation]. Rice University; 2016. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1911/96257.
Council of Science Editors:
Jiang C. Carbon Nanotubides: an Alternative for Dispersion, Functionalization and Composites Fabrication. [Doctoral Dissertation]. Rice University; 2016. Available from: http://hdl.handle.net/1911/96257
12.
Motoc, Dana.
Development of green composites based on epoxidized vegetable oils (EVOs) with hybrid reinforcements: natural and inorganic fibers.
Degree: 2017, Universitat Politècnica de València
URL: http://hdl.handle.net/10251/90399
► The main aim of this work id to provide integral methods to predict and characterize the properties of composite structures based on hybrid polymers and…
(more)
▼ The main aim of this work id to provide integral methods to predict and characterize the properties of composite structures based on hybrid polymers and reinforcements, that could lead to useful results from an industrial point of view. This is addressed, if possible, by theoretical predictions of the effective properties by using the available experimental data.
The first part is focused on the scientific achievements of the author that allowed a quantitative characterization of the main effective properties of several composite architectures from hybrid polymers and reinforcements, based on bio matrices, tailor-made matrices and different theoretical and simulation methods using computer software to allow good comparison. The second part defines the future research lines to continue this initial investigation.
The main objectives are clearly defined to give the reader a sound background with the appropriate concepts that are specifically discussed in the following chapters. As a main objective, this research work makes a first attempt to provide a systematic analysis and prediction of composite hybrid structures.; El objetivo general del trabajo es proporcionar medios integrales para predecir y caracterizar las propiedades de las estructuras de compuestos basados en polímeros y refuerzos híbridos, principales que pueden producir resultados de utilidad práctica simultáneamente. Esto se logra comparando, siempre que sea posible, las predicciones teóricas de las propiedades efectivas con los datos experimentales disponibles.
Una primera parte se ocupa de los logros científicos del autor que permitieron caracterizar cuantitativamente las principales propiedades efectivas de las arquitecturas de compuestos basados en polímeros y refuerzos híbridos, basados en matrices bio, auto-desarrollados y diferentes métodos teóricos y de simulación por ordenador utilizados para la comparación. La segunda parte identifica las orientaciones futuras para la evolución y desarrollo de la ciencia y la investigación.
Los objetivos generales fueron subrayados y concisos para dar al lector una visión previa de los conceptos que serán discutidos específicamente en los siguientes capítulos. Indirectamente, apuntan hacia uno de los objetivos principales de este trabajo, a saber, proporcionar una dirección para el análisis sistemático de materiales compuestos a base de refuerzos híbridos.; L'objectiu general d'aquest treball es proporcionar els mitjos integrals per tal de predir i caracteritzar les propietats d'estructures de compòsits basats en polímers i reforçaments híbrids, que poden produir resultats amb utilitat pràctica simultàniament. Aquest objectiu s'aconsegueix comparant, sempre que és possible, les prediccions teòriques de les propietats efectives amb les dades experimentals disponibles.
Una primera part es centra en els temes científics en què ha treballat l'autor que han permès caracteritzar quantitativament les principals propietats efectives de les arquitectures de compòsits basades en polímers i reforçaments híbrids, derivats…
Advisors/Committee Members: Balart Gimeno, Rafael Antonio (advisor), Ferrándiz Bou, Santiago (advisor).
Subjects/Keywords: hybrid polymer composite; flax fiber; basalt fiber; carbon fiber
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APA ·
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Manager
APA (6th Edition):
Motoc, D. (2017). Development of green composites based on epoxidized vegetable oils (EVOs) with hybrid reinforcements: natural and inorganic fibers.
(Doctoral Dissertation). Universitat Politècnica de València. Retrieved from http://hdl.handle.net/10251/90399
Chicago Manual of Style (16th Edition):
Motoc, Dana. “Development of green composites based on epoxidized vegetable oils (EVOs) with hybrid reinforcements: natural and inorganic fibers.
” 2017. Doctoral Dissertation, Universitat Politècnica de València. Accessed February 27, 2021.
http://hdl.handle.net/10251/90399.
MLA Handbook (7th Edition):
Motoc, Dana. “Development of green composites based on epoxidized vegetable oils (EVOs) with hybrid reinforcements: natural and inorganic fibers.
” 2017. Web. 27 Feb 2021.
Vancouver:
Motoc D. Development of green composites based on epoxidized vegetable oils (EVOs) with hybrid reinforcements: natural and inorganic fibers.
[Internet] [Doctoral dissertation]. Universitat Politècnica de València; 2017. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10251/90399.
Council of Science Editors:
Motoc D. Development of green composites based on epoxidized vegetable oils (EVOs) with hybrid reinforcements: natural and inorganic fibers.
[Doctoral Dissertation]. Universitat Politècnica de València; 2017. Available from: http://hdl.handle.net/10251/90399
University of New Mexico
13.
van de Werken, Nekoda.
EFFECT OF ALIGNMENT, SIZING, AND MANUFACTURING METHOD ON MECHANICAL PROPERTIES OF RECYCLED CARBON FIBER COMPOSITES.
Degree: Mechanical Engineering, 2017, University of New Mexico
URL: https://digitalrepository.unm.edu/me_etds/143
► The exceptional combination of properties offered by carbon fiber composites has propelled their incorporation into high performance markets such as aerospace, wind energy, luxury…
(more)
▼ The exceptional combination of properties offered by
carbon fiber composites has propelled their incorporation into high performance markets such as aerospace, wind energy, luxury cars and sporting goods. While the use of
carbon fiber in these sectors is expected to continue to increase, the high price and energy cost associated with
carbon fiber production acts as a significant barrier of entry into larger volume markets, such as the automotive industry. One method of navigating this transition is through the use of recycled
carbon fiber composites.
Carbon fiber reclamation can produce fibers with up to 90% and 100% of the strength and stiffness, respectively, and 25% and 10-20% of the cost and production energy, respectively, of virgin fibers. In this study, we investigate the structure and properties of recycled
carbon fibers and their composites. The surface of the recycled fibers was characterized with both SEM and XPS, and the mechanical properties were characterized with single
fiber tensile tests. Aligned
fiber mats were processed using a centrifugal alignment technique. Alignment was characterized using image processing, and the composite mechanical properties were investigated using tensile tests. Finally, theoretical modeling of tensile strength and stiffness of composites were performed.
Fiber orientation and length distributions, FOD and FLD, respectively, were taken from experimental image analysis of
fiber mats and were input to the model. Effect of FOD and FLD as well as
fiber-matrix shear strength were investigated. The modeling provided crucial information that can be used to guide the design of the recycled
fiber composites.
Advisors/Committee Members: Mehran Tehrani, Yu-Lin Shen, Mahmoud R. Taha.
Subjects/Keywords: Recycled carbon fiber; fiber alignment; discontinuous fiber composites; Mechanical Engineering
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APA ·
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APA (6th Edition):
van de Werken, N. (2017). EFFECT OF ALIGNMENT, SIZING, AND MANUFACTURING METHOD ON MECHANICAL PROPERTIES OF RECYCLED CARBON FIBER COMPOSITES. (Masters Thesis). University of New Mexico. Retrieved from https://digitalrepository.unm.edu/me_etds/143
Chicago Manual of Style (16th Edition):
van de Werken, Nekoda. “EFFECT OF ALIGNMENT, SIZING, AND MANUFACTURING METHOD ON MECHANICAL PROPERTIES OF RECYCLED CARBON FIBER COMPOSITES.” 2017. Masters Thesis, University of New Mexico. Accessed February 27, 2021.
https://digitalrepository.unm.edu/me_etds/143.
MLA Handbook (7th Edition):
van de Werken, Nekoda. “EFFECT OF ALIGNMENT, SIZING, AND MANUFACTURING METHOD ON MECHANICAL PROPERTIES OF RECYCLED CARBON FIBER COMPOSITES.” 2017. Web. 27 Feb 2021.
Vancouver:
van de Werken N. EFFECT OF ALIGNMENT, SIZING, AND MANUFACTURING METHOD ON MECHANICAL PROPERTIES OF RECYCLED CARBON FIBER COMPOSITES. [Internet] [Masters thesis]. University of New Mexico; 2017. [cited 2021 Feb 27].
Available from: https://digitalrepository.unm.edu/me_etds/143.
Council of Science Editors:
van de Werken N. EFFECT OF ALIGNMENT, SIZING, AND MANUFACTURING METHOD ON MECHANICAL PROPERTIES OF RECYCLED CARBON FIBER COMPOSITES. [Masters Thesis]. University of New Mexico; 2017. Available from: https://digitalrepository.unm.edu/me_etds/143
University of Tennessee – Knoxville
14.
Crabtree, Joshua David.
Characterization of Commercial Carbon fiber from Standard PAN Precursors and Low-Cost Carbon Fiber from Textile PAN based Precursors.
Degree: MS, Engineering Science, 2019, University of Tennessee – Knoxville
URL: https://trace.tennessee.edu/utk_gradthes/5457
► There is tremendous need to integrate carbon fiber composites for light-weighting in the transportation sector, especially for automotive composites and in energy generation space associated…
(more)
▼ There is tremendous need to integrate
carbon fiber composites for light-weighting in the transportation sector, especially for automotive composites and in energy generation space associated with wind turbine manufacturing. Tensile properties of
carbon fibers are fundamental to designing
fiber reinforced polymers and
carbon/carbon composites.
Carbon fiber suppliers typically follow general guidelines prescribed in the relevant standards (ASTM D4018) to prepare resin reinforced
carbon fiber tows for determining the tensile properties. In this study, the effect of manufacturing process associated with
carbon fiber tows was evaluated using two methods involving manual tensioned strands or using automated spool method. Important effects associated with
fiber spacing, cross-sectional morphology of the infused tows are reported in this study. Single
fiber mechanical properties are determined to obtain relationship from multiple length scales and the role of interfacial behavior between the
carbon fiber and resin system using single
fiber fragmentation. These results, for the first time, revealed important relationships between single
fiber, interface, and infused tow based mechanical properties. A new concept for deformation response of infused tows, limit stress, demonstrated a connection in the nonlinearity nature of tensile modulus seen for
carbon fibers in single
fiber state and in tow format. Limit stress showed good representation of the relative role of relationships (interfacial behavior, crack propagation, and stress transfer) from limit stress to failure stress.Three low-cost precursors, oxidized PAN, and
carbon fiber, from the
Carbon Fiber Technology Facility with differences in spin finish and/or tenacity are studied in detail through various stages of oxidative stabilization and carbonization to develop improved understanding of the precursor properties and final textile PAN based
carbon fiber properties. A systematic approach consisting of DSC, TGA, FT-IR, XRD, single
fiber testing, and infused tow testing were considered in evaluating the process-structure-tensile property relationship for the three precursors. The results identified the role of spin finish and tenacity on the performance of low-cost
carbon fiber. This part of the research provides an important conclusion that the
carbon fiber manufacturing process using textile PAN precursors is industrially robust and is not strongly dependent on precursor tenacity or surface finish.
Advisors/Committee Members: Dayakar Penumadu, Uday Vaidya, David Harper.
Subjects/Keywords: polyacrylonitrile; carbon fiber; mechanical properties; low-cost carbon fiber; textile polyacrylonitrile
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APA (6th Edition):
Crabtree, J. D. (2019). Characterization of Commercial Carbon fiber from Standard PAN Precursors and Low-Cost Carbon Fiber from Textile PAN based Precursors. (Thesis). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_gradthes/5457
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Crabtree, Joshua David. “Characterization of Commercial Carbon fiber from Standard PAN Precursors and Low-Cost Carbon Fiber from Textile PAN based Precursors.” 2019. Thesis, University of Tennessee – Knoxville. Accessed February 27, 2021.
https://trace.tennessee.edu/utk_gradthes/5457.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Crabtree, Joshua David. “Characterization of Commercial Carbon fiber from Standard PAN Precursors and Low-Cost Carbon Fiber from Textile PAN based Precursors.” 2019. Web. 27 Feb 2021.
Vancouver:
Crabtree JD. Characterization of Commercial Carbon fiber from Standard PAN Precursors and Low-Cost Carbon Fiber from Textile PAN based Precursors. [Internet] [Thesis]. University of Tennessee – Knoxville; 2019. [cited 2021 Feb 27].
Available from: https://trace.tennessee.edu/utk_gradthes/5457.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Crabtree JD. Characterization of Commercial Carbon fiber from Standard PAN Precursors and Low-Cost Carbon Fiber from Textile PAN based Precursors. [Thesis]. University of Tennessee – Knoxville; 2019. Available from: https://trace.tennessee.edu/utk_gradthes/5457
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Houston
15.
Chang, Christiana.
Multifunctional Carbon-Polymer Composites for Temperature Sensing and De-Icing.
Degree: PhD, Mechanical Engineering, 2013, University of Houston
URL: http://hdl.handle.net/10657/1090
► This dissertation presents the work conducted on two major projects: 1) a structurally integrated, continuous carbon fiber heating element based polymer composite system for the…
(more)
▼ This dissertation presents the work conducted on two major projects: 1) a structurally integrated, continuous
carbon fiber heating element based polymer composite system for the de-icing of wind turbine blades and 2) modeling and experimental verification of piezoresistivity of
carbon nanotube/nanofiber based polymer nanocomposite strain sensors. First, icing events on wind turbine blades not only cause a stop in production, but can also lead to serious structural damage to the turbine itself and surrounding structures. This work proposes a structurally integrated, continuous
carbon fiber heating element wind turbine blade de-icing system, including an environmental condition based control system for heating actuation.
Next, a Monte Carlo based numerical simulation of electrical conduction through a
carbon nanotube/nanofiber-polymer nanocomposite is presented.
Carbon nanocomposites show great promise as structurally integrated, highly sensitive strain sensors due to their inherent piezoresistivity, but many mechanisms affecting their gauge factor, such as that of temperature, are not well understood. This dissertation presents modification made to an existing Monte Carlo simulation of nanocomposite resistivity, extending its functionality to predict piezoresistive properties dependent on composite temperature. The numerical model is verified with experimental results of
carbon nanotube-epoxy nanocomposites under strain at varying sample temperatures.
Advisors/Committee Members: Song, Gangbing (advisor), Franchek, Matthew A. (committee member), Sharma, Pradeep (committee member), Mo, Yi-Lung (committee member), Li, Mo (committee member).
Subjects/Keywords: Carbon fiber; Carbon nanofibers; Carbon nanotubes; Nanocomposites; Piezoresistivity; De-icing
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APA (6th Edition):
Chang, C. (2013). Multifunctional Carbon-Polymer Composites for Temperature Sensing and De-Icing. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/1090
Chicago Manual of Style (16th Edition):
Chang, Christiana. “Multifunctional Carbon-Polymer Composites for Temperature Sensing and De-Icing.” 2013. Doctoral Dissertation, University of Houston. Accessed February 27, 2021.
http://hdl.handle.net/10657/1090.
MLA Handbook (7th Edition):
Chang, Christiana. “Multifunctional Carbon-Polymer Composites for Temperature Sensing and De-Icing.” 2013. Web. 27 Feb 2021.
Vancouver:
Chang C. Multifunctional Carbon-Polymer Composites for Temperature Sensing and De-Icing. [Internet] [Doctoral dissertation]. University of Houston; 2013. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10657/1090.
Council of Science Editors:
Chang C. Multifunctional Carbon-Polymer Composites for Temperature Sensing and De-Icing. [Doctoral Dissertation]. University of Houston; 2013. Available from: http://hdl.handle.net/10657/1090
Oregon State University
16.
Daniels, Mitchell Alan.
Experimental Classification of Intralaminar Matrix Compression Damage Propagation in Carbon Fiber Reinforced Polymers.
Degree: MS, Mechanical Engineering, 2016, Oregon State University
URL: http://hdl.handle.net/1957/59891
► Composites often are able to carry more load after damage due to the structure of laminates. In addition, damage can be difficult to detect in…
(more)
▼ Composites often are able to carry more load after damage due to the structure of laminates. In addition, damage can be difficult to detect in composites compared to homogeneous materials. Understanding the behavior of composite material after damage is vital for composite structural design. Currently, experimental methods exist for classifying
fiber tension,
fiber compression, and matrix tensile damage propagation. However, little has been done on matrix compression propagation. First, several candidate specimens were identified based on
fiber compression studies. These specimens were modeled using FEA and the base continuum damage mechanics models. The size of the matrix compressive damage region was compared to select the specimens. Compact compression and center notch compression specimens showed good isolation of compressive damage. Compact compression specimens were chosen, as they were less dependent on the boundary conditions to achieve the desired damage mechanisms. These specimens were then manufactured and tested along with uniform compression specimens. Shear cracks propagating through the thickness of the material were the primary failure mechanism observed,
with other damage mechanisms occurring after some propagation. A contour J-integral was used to measure the strain energy release rate from DIC displacement field data. The plastic behavior of the material was classified to determine the applicability of the J-integral. It was determined that the J-integral is potentially valid for compressive damage initiation. Typical values showed a range of energy dissipation values when damage initiation between 30 kJ/m² and 40 kJ/m². These values were reflected in the areas under the uniform compression specimen stress-displacement curves for similar fracture angles. These specimens also showed correlation between energy dissipation and fracture plane angle. This is due to a greater contribution of mode I compression at lower angles. Residual stresses were observed in the past damage material due to friction,
fiber bridging and crack locking. These results show the limitations of the base continuum damage mechanics models and associated assumptions.
Advisors/Committee Members: Parmigiani, John P. (advisor), Bay, Brain (committee member).
Subjects/Keywords: Composites; Carbon fiber-reinforced plastics – Compression testing
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APA (6th Edition):
Daniels, M. A. (2016). Experimental Classification of Intralaminar Matrix Compression Damage Propagation in Carbon Fiber Reinforced Polymers. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/59891
Chicago Manual of Style (16th Edition):
Daniels, Mitchell Alan. “Experimental Classification of Intralaminar Matrix Compression Damage Propagation in Carbon Fiber Reinforced Polymers.” 2016. Masters Thesis, Oregon State University. Accessed February 27, 2021.
http://hdl.handle.net/1957/59891.
MLA Handbook (7th Edition):
Daniels, Mitchell Alan. “Experimental Classification of Intralaminar Matrix Compression Damage Propagation in Carbon Fiber Reinforced Polymers.” 2016. Web. 27 Feb 2021.
Vancouver:
Daniels MA. Experimental Classification of Intralaminar Matrix Compression Damage Propagation in Carbon Fiber Reinforced Polymers. [Internet] [Masters thesis]. Oregon State University; 2016. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1957/59891.
Council of Science Editors:
Daniels MA. Experimental Classification of Intralaminar Matrix Compression Damage Propagation in Carbon Fiber Reinforced Polymers. [Masters Thesis]. Oregon State University; 2016. Available from: http://hdl.handle.net/1957/59891
Cornell University
17.
Buettner, Jonas.
Investigation Of Bacterial Cellulose As A Carbon Fiber Precursor And Its Potential For Piezoelectric Energy Harvesting.
Degree: M.S., Materials Science and Engineering, Materials Science and Engineering, 2014, Cornell University
URL: http://hdl.handle.net/1813/38993
► Bacterial cellulose was investigated regarding its suitability as a carbon fiber precursor as well as its potential in energy harvesting applications due to its inherent…
(more)
▼ Bacterial cellulose was investigated regarding its suitability as a
carbon fiber precursor as well as its potential in energy harvesting applications due to its inherent piezoelectric properties. Graphitization of bacterial cellulose was found to be insufficient up to treatment temperatures of 2200 ?C. The resulting structure without hot-stretching during the process is amorphous. Piezoelectricity was confirmed in bacterial cellulose. BC cantilevers were induced to oscillate via an electrical field applied across the thickness of the cantilever. Due to the random network structure of BC, methods for aligned growth were tested. Spatially confined growth on a patterned PDMS substrate resulted in aligned
fiber threads. iii
Advisors/Committee Members: Netravali, Anil Narayan (chair), Van Dover, Robert B. (committee member).
Subjects/Keywords: bacterial cellulose; carbon fiber precursor; energy harvesting
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APA (6th Edition):
Buettner, J. (2014). Investigation Of Bacterial Cellulose As A Carbon Fiber Precursor And Its Potential For Piezoelectric Energy Harvesting. (Masters Thesis). Cornell University. Retrieved from http://hdl.handle.net/1813/38993
Chicago Manual of Style (16th Edition):
Buettner, Jonas. “Investigation Of Bacterial Cellulose As A Carbon Fiber Precursor And Its Potential For Piezoelectric Energy Harvesting.” 2014. Masters Thesis, Cornell University. Accessed February 27, 2021.
http://hdl.handle.net/1813/38993.
MLA Handbook (7th Edition):
Buettner, Jonas. “Investigation Of Bacterial Cellulose As A Carbon Fiber Precursor And Its Potential For Piezoelectric Energy Harvesting.” 2014. Web. 27 Feb 2021.
Vancouver:
Buettner J. Investigation Of Bacterial Cellulose As A Carbon Fiber Precursor And Its Potential For Piezoelectric Energy Harvesting. [Internet] [Masters thesis]. Cornell University; 2014. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1813/38993.
Council of Science Editors:
Buettner J. Investigation Of Bacterial Cellulose As A Carbon Fiber Precursor And Its Potential For Piezoelectric Energy Harvesting. [Masters Thesis]. Cornell University; 2014. Available from: http://hdl.handle.net/1813/38993
Rice University
18.
Headrick, Robert J.
Novel solution processing and characterization of aligned carbon nanotube materials for rapid composition-property relationship determination and additive manufacturing.
Degree: PhD, Natural Sciences, 2018, Rice University
URL: http://hdl.handle.net/1911/105701
► At the microscopic scale, carbon nanotubes (CNTs) combine impressive tensile strength and electrical conductivity; however, their macroscopic counterparts have yet to meet expectations. The reasons…
(more)
▼ At the microscopic scale,
carbon nanotubes (CNTs) combine impressive tensile strength and electrical conductivity; however, their macroscopic counterparts have yet to meet expectations. The reasons have been variously attributed to inherent CNT sample properties (diameter and helicity polydispersity, high defect density, insufficient length) and manufacturing shortcomings (inadequate ordering and packing) which can lead to poor transmission of stress and current. To efficiently investigate the disparity between molecular and macroscopic properties, we have simplified CNT purification and developed a method for solution processing sub-milligram quantities of CNTs dissolved in chlorosulfonic acid (CSA) into films and fibers with high structural order. The aligned films have a high degree of order and exhibit anisotropic optical, electrical, and mechanical properties homogeneously over 10 cm2. We utilize this process to reduce the experimental time required for high performance CNT
fiber production from two days to one hour, enabling efficient analysis of the structure-property relations that govern CNT
fiber properties. A new vibroscopic linear density measurement technique capable of accurately characterizing the specific properties of the small-scale short (~7 cm) CNT fibers is also introduced.
These novel processing methods can be performed at a scale low enough to be accessible to exotic SWCNT materials such as those enriched in metallicity, which are currently only available in the few milligram quantities. A selective reaction to remove metallic SWCNTs and the aqueous two phase extraction (ATPE) method are explored as possible sources for type and helicity enriched SWCNT samples for further solution processing. We successfully scale the ATPE method and obtain relatively large quantities of a semiconducting sample enriched in two chiralities and another sample enriched in (6,6) armchair SWCNTs. Importantly, the materials can be cleaned of impurities introduced during the separation process and behave as expected after dissolution in CSA. However, the separated CNTs are found to be too short for aligned film and
fiber fabrication.
Finally, this thesis introduces versatile solvents composed of phosphoric acid, methanesulfonic acid, and p-toluenesulfonic acid (pToS) mixed with oleum for assembling high quality, large diameter CNTs into 2 and 3D structures. The new acid solvents spontaneously dissolve CNTs to high concentrations and allow Mayer rod coating, silkscreen printing, and injection of CNTs onto substrates such as polyethylene terephthalate, polyester fabric, and polycarbonate. We prepare flexible transparent electrodes with properties matching the performance obtained when using superacid solvents. Additionally, pToS gently solidifies upon exposure to ambient moisture, enabling 3D-printing neat structures with commercially available equipment.
Advisors/Committee Members: Pasquali, Matteo (advisor).
Subjects/Keywords: carbon nanotube; 3D printing; CNT fiber
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APA (6th Edition):
Headrick, R. J. (2018). Novel solution processing and characterization of aligned carbon nanotube materials for rapid composition-property relationship determination and additive manufacturing. (Doctoral Dissertation). Rice University. Retrieved from http://hdl.handle.net/1911/105701
Chicago Manual of Style (16th Edition):
Headrick, Robert J. “Novel solution processing and characterization of aligned carbon nanotube materials for rapid composition-property relationship determination and additive manufacturing.” 2018. Doctoral Dissertation, Rice University. Accessed February 27, 2021.
http://hdl.handle.net/1911/105701.
MLA Handbook (7th Edition):
Headrick, Robert J. “Novel solution processing and characterization of aligned carbon nanotube materials for rapid composition-property relationship determination and additive manufacturing.” 2018. Web. 27 Feb 2021.
Vancouver:
Headrick RJ. Novel solution processing and characterization of aligned carbon nanotube materials for rapid composition-property relationship determination and additive manufacturing. [Internet] [Doctoral dissertation]. Rice University; 2018. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1911/105701.
Council of Science Editors:
Headrick RJ. Novel solution processing and characterization of aligned carbon nanotube materials for rapid composition-property relationship determination and additive manufacturing. [Doctoral Dissertation]. Rice University; 2018. Available from: http://hdl.handle.net/1911/105701
University of Toronto
19.
Cheng, Billy.
Wear and Friction Modelling of Carbon Fiber Reinforced Epoxy Composites.
Degree: PhD, 2020, University of Toronto
URL: http://hdl.handle.net/1807/100914
► The wear resistance of unidirectional carbon fiber reinforced epoxy under severe abrasive sliding conditions was studied. It was found that unidirectional laminates tested with the…
(more)
▼ The wear resistance of unidirectional
carbon fiber reinforced epoxy under severe abrasive sliding conditions was studied. It was found that unidirectional laminates tested with the fibers parallel to the sliding direction (UDp) were more wear resistant under the same set of test conditions when compared to the laminates tested with fibers transverse to the sliding direction (UDap).
A novel energy-based model was developed to explain the difference in the wear rate of unidirectional laminates. The model predicts that wear volume per sliding distance is proportional to the total frictional energy, the average volume to surface area ratio of the debris, the energy required to generate new surfaces, and a novel k factor that represents the fraction of the total friction energy used for creating wear particles. It was found that while the wear mechanisms of UDp specimens enabled the generation of debris particles with higher volume to surface area ratio, a lower fraction of the frictional energy was used for wear particle generation (a much lower k), which ultimately lead to a lower wear volume per sliding distance compared to UDap specimens.
Heterogeneous surface wear models were proposed to predict the specific wear rates of woven
carbon fabric reinforced epoxy laminates. Derivation of the models assumed that each
fiber orientation was either worn at the same rate due to normal load redistribution (EW model) or worn at different rates but under equal pressure (EP model). Under mild abrasive sliding, the EW model was able to predict the specific wear rates of both laminates well. However, the models grossly under-estimated the specific wear rates of the woven laminates due to wear mechanisms that are specific to woven fabric laminates that involved the out-of-plane fibers at the cross-over points in the
carbon weave.
Finally, a model was proposed for predicting the coefficient of friction of the woven fabric laminates. This model was derived using the same set of assumptions as the EW model for specific wear rate. The model results matched the experimental data very well in all tested conditions.
Advisors/Committee Members: Kortschot, Mark T, Chemical Engineering Applied Chemistry.
Subjects/Keywords: Carbon Fiber; Composites; Friction; Wear; 0794
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APA (6th Edition):
Cheng, B. (2020). Wear and Friction Modelling of Carbon Fiber Reinforced Epoxy Composites. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/100914
Chicago Manual of Style (16th Edition):
Cheng, Billy. “Wear and Friction Modelling of Carbon Fiber Reinforced Epoxy Composites.” 2020. Doctoral Dissertation, University of Toronto. Accessed February 27, 2021.
http://hdl.handle.net/1807/100914.
MLA Handbook (7th Edition):
Cheng, Billy. “Wear and Friction Modelling of Carbon Fiber Reinforced Epoxy Composites.” 2020. Web. 27 Feb 2021.
Vancouver:
Cheng B. Wear and Friction Modelling of Carbon Fiber Reinforced Epoxy Composites. [Internet] [Doctoral dissertation]. University of Toronto; 2020. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1807/100914.
Council of Science Editors:
Cheng B. Wear and Friction Modelling of Carbon Fiber Reinforced Epoxy Composites. [Doctoral Dissertation]. University of Toronto; 2020. Available from: http://hdl.handle.net/1807/100914
Delft University of Technology
20.
van der Klift, Frank (author).
3D Printed Unidirectional Carbon Fibre Reinforced Polymers for aerospace applications.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:c9452896-6134-40df-b580-5750e9bdcd8b
► In order to save weight and reduce the impact on the environment, the aerospace industry keeps searching for strong and lightweight materials to reduce fuel…
(more)
▼ In order to save weight and reduce the impact on the environment, the aerospace industry keeps searching for strong and lightweight materials to reduce fuel consumption. A relatively new manufacturing technique made it possible to print nylon, reinforced with continuous unidirectional
carbon fibres on a layer-by-layer basis and praised itself for making materials as strong as Aluminium 6061-T6. In this study, several coupons were 3D printed and tested in tensile, compression and three point bending mode to determine the material properties. When loaded in the direction of the fibres, the material did not live up to the upper limit of the rule of mixtures for fibre reinforced composites, which is mainly due to the amount of voids in the material. These voids were discovered when studying the micro-structure of the material and were both in between the layers, as well as in the layers themselves. The mechanical tests were performed to validate constructed finite element models, simulated in Abaqus/CAE. The simulation results showed some mismatches with the mechanical test results, which were caused by the assumptions made to simplify the models. Finally, an air plane chair bracket, which has as task to transfer loads from the back seat panel to the chair, was modelled, simulated and designed. Major issues in the designing process were the limitations of the printer, such as not being able to choose which exact areas to reinforce in a specific layer. The final design of the chair bracket was manufactured and was tested to see if it could withstand a load of 375 N. The part did not fracture under the load, but a high displacement of the back seat was observed, as well as damage occurring at other locations than the simulations indicated. The study showed that this 3D printing technique is able to print structural aerospace parts, given that the part is not too complex and that it is loaded in a static nature. More freedom in the design software of the 3D printer could allow the user to successfully design more complex structural aerospace parts. Since the constructed parts were only tested under static loading, further research has to be conduction into dynamic loading of these parts before it is possible to actually implement these in air planes.
Advisors/Committee Members: Hermans, Marcel (mentor), van den Brink, W.M. (mentor), Bessa, Miguel (graduation committee), Janssen, Michael (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: 3D printing; FDM; carbon fiber; Composites
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APA (6th Edition):
van der Klift, F. (. (2017). 3D Printed Unidirectional Carbon Fibre Reinforced Polymers for aerospace applications. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:c9452896-6134-40df-b580-5750e9bdcd8b
Chicago Manual of Style (16th Edition):
van der Klift, Frank (author). “3D Printed Unidirectional Carbon Fibre Reinforced Polymers for aerospace applications.” 2017. Masters Thesis, Delft University of Technology. Accessed February 27, 2021.
http://resolver.tudelft.nl/uuid:c9452896-6134-40df-b580-5750e9bdcd8b.
MLA Handbook (7th Edition):
van der Klift, Frank (author). “3D Printed Unidirectional Carbon Fibre Reinforced Polymers for aerospace applications.” 2017. Web. 27 Feb 2021.
Vancouver:
van der Klift F(. 3D Printed Unidirectional Carbon Fibre Reinforced Polymers for aerospace applications. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Feb 27].
Available from: http://resolver.tudelft.nl/uuid:c9452896-6134-40df-b580-5750e9bdcd8b.
Council of Science Editors:
van der Klift F(. 3D Printed Unidirectional Carbon Fibre Reinforced Polymers for aerospace applications. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:c9452896-6134-40df-b580-5750e9bdcd8b
Oregon State University
21.
Koski, William C.
Design, analysis, and validation of composite c-channel beams.
Degree: MS, Mechanical Engineering, 2012, Oregon State University
URL: http://hdl.handle.net/1957/34292
► A lightweight carbon fiber reinforced polymer (CFRP) c-channel beam was previously designed using analytical theory and finite element analysis and subsequently manufactured through a pultrusion…
(more)
▼ A lightweight
carbon fiber reinforced polymer (CFRP) c-channel beam was previously designed using analytical theory and finite element analysis and subsequently manufactured through a pultrusion process. Physical testing revealed the prototype did not meet the bending and torsional stiffness of the beam model. An investigation revealed that the manufactured prototype had lower
fiber content than designed, compacted geometry, an altered ply layup, missing plies, and ply folds. Incorporating these changes into the beam model significantly improved model-experiment agreement.
Using what was learned from the initial prototype, several new beam designs were modeled that compare the cost per weight-savings of different composite materials. The results of these models show that fiberglass is not a viable alternative to CFRP when designing for equivalent stiffness. Standard modulus
carbon was shown
to have slightly lower cost per-weight savings than intermediate modulus
carbon, although intermediate modulus
carbon saves more weight overall. Core materials, despite potential weight savings, were ruled out as they do not have the crush resistance to handle the likely clamp loads of any attaching bolts. Despite determining the ideal materials, the manufactured cost per weight-savings of the best CFRP beam design was about double the desired target.
Advisors/Committee Members: Parmigiani, John (advisor), Bay, Brian (committee member).
Subjects/Keywords: Composites; Carbon fiber-reinforced plastics – Testing
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APA (6th Edition):
Koski, W. C. (2012). Design, analysis, and validation of composite c-channel beams. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/34292
Chicago Manual of Style (16th Edition):
Koski, William C. “Design, analysis, and validation of composite c-channel beams.” 2012. Masters Thesis, Oregon State University. Accessed February 27, 2021.
http://hdl.handle.net/1957/34292.
MLA Handbook (7th Edition):
Koski, William C. “Design, analysis, and validation of composite c-channel beams.” 2012. Web. 27 Feb 2021.
Vancouver:
Koski WC. Design, analysis, and validation of composite c-channel beams. [Internet] [Masters thesis]. Oregon State University; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1957/34292.
Council of Science Editors:
Koski WC. Design, analysis, and validation of composite c-channel beams. [Masters Thesis]. Oregon State University; 2012. Available from: http://hdl.handle.net/1957/34292
Brigham Young University
22.
Barlow, Analise.
Strength Investigation of Damaged and Repaired Thin-Walled Composite Structures.
Degree: MS, 2018, Brigham Young University
URL: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8714&context=etd
► The purpose of this research was to quantify the strength of novel composite repair methods for thin-walled composite structures. Carbon/epoxy plates were manufactured and repairs…
(more)
▼ The purpose of this research was to quantify the strength of novel composite repair methods for thin-walled composite structures. Carbon/epoxy plates were manufactured and repairs were made at Gloyer-Taylor Laboratories. At BYU, specimens were damaged in a controlled and repeatable process. Three damage modes were implemented: impact, groove, and abrasive damage. Tensile strength tests were performed on control, damaged, and repaired specimens. Four 24 x 24 in (60 x 60 cm) carbon/epoxy plates were received. Each plate was made up of seven plies cured together with epoxy resin for a nominal total thickness of 0.04 in (1.02 mm). The thickness, however, was not uniform: each plate had a smooth side and a wavy side. This resulted in inconsistent damage depth. The plates were cut at BYU using a water-jet cutter into 1 in. (25.4 mm) wide by 8 in. (203.2 mm) long test specimens. Test specimens were grouped into four categories: control specimens, specimens inflicted with damage by machining a shallow groove ranging from 0.012 — 0.018 in. (0.30 — 0.46 mm) deep, specimens inflicted with an abrasive-type damage ranging from 0.006 — 0.012 in. (0.15 — 0.30 mm) deep, and specimens subjected to impact damage ranging from 1.47 — 3.23 J. Five specimens were placed in the control group. Ten specimens were placed in each of the remaining damage groups. All ten specimens were damaged, but only five of each were sent to be repaired. The randomization of the thickness variable was prevented by the desire to repair damaged specimens as a group with a single repair rather than performing repairs on every individual specimen. The stress-strain behavior confirm the control specimens generally exhibited the best overall behavior, as expected. Most damaged specimens, including the repaired specimens, exhibited lower ultimate stress than the undamaged control specimens. The repaired specimens exhibited a higher initial stiffness than either the control or damaged specimens, due to the stiffness of the composite patch. Although repaired specimens should exhibit higher strength than damaged specimens, but this however, was not always the case. In particular, repairs did not improve the ultimate strength of the specimens damaged by abrasion. Correlations between the different damage types were developed, relating damage intensity and strength was approximately. This suggests further investigation is needed.
Subjects/Keywords: composite; carbon fiber; damage; repair; Engineering
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APA (6th Edition):
Barlow, A. (2018). Strength Investigation of Damaged and Repaired Thin-Walled Composite Structures. (Masters Thesis). Brigham Young University. Retrieved from https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8714&context=etd
Chicago Manual of Style (16th Edition):
Barlow, Analise. “Strength Investigation of Damaged and Repaired Thin-Walled Composite Structures.” 2018. Masters Thesis, Brigham Young University. Accessed February 27, 2021.
https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8714&context=etd.
MLA Handbook (7th Edition):
Barlow, Analise. “Strength Investigation of Damaged and Repaired Thin-Walled Composite Structures.” 2018. Web. 27 Feb 2021.
Vancouver:
Barlow A. Strength Investigation of Damaged and Repaired Thin-Walled Composite Structures. [Internet] [Masters thesis]. Brigham Young University; 2018. [cited 2021 Feb 27].
Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8714&context=etd.
Council of Science Editors:
Barlow A. Strength Investigation of Damaged and Repaired Thin-Walled Composite Structures. [Masters Thesis]. Brigham Young University; 2018. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8714&context=etd
23.
Brunell, Garrett Floyd.
Functionality of a Damaged Steel Truss Bridge Strengthened with Post-Tensioned CFRP Tendons.
Degree: 2012, North Dakota State University
URL: http://hdl.handle.net/10365/26559
► This research program investigates the performance of a steel truss bridge when subjected to both localized web damage and a subsequent post-tensioned strengthening approach. The…
(more)
▼ This research program investigates the performance of a steel truss bridge when subjected to both localized web damage and a subsequent post-tensioned strengthening approach. The investigation utilizes a combined approach involving an experimental scale model bridge and a numerical computer model generated using the commercial finite element software RISA 3-D. The numerical model is validated using test data and further extended to parametric studies in order to investigate the theoretical load rating, strain energy, load redistribution, mode shapes and frequency of the bridge for control, damaged and strengthened states. The presence and severity of damage are found to significantly influence the global safety and reliability of the bridge. Also, higher order modes are more susceptible to changes in shape and frequency in the presence of damage. A recovery of truss deflection and a reduction of member forces are achieved by the proposed strengthening method.
Subjects/Keywords: Static tests.; Carbon fiber-reinforced plastics.; Trusses.
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APA (6th Edition):
Brunell, G. F. (2012). Functionality of a Damaged Steel Truss Bridge Strengthened with Post-Tensioned CFRP Tendons. (Thesis). North Dakota State University. Retrieved from http://hdl.handle.net/10365/26559
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Brunell, Garrett Floyd. “Functionality of a Damaged Steel Truss Bridge Strengthened with Post-Tensioned CFRP Tendons.” 2012. Thesis, North Dakota State University. Accessed February 27, 2021.
http://hdl.handle.net/10365/26559.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Brunell, Garrett Floyd. “Functionality of a Damaged Steel Truss Bridge Strengthened with Post-Tensioned CFRP Tendons.” 2012. Web. 27 Feb 2021.
Vancouver:
Brunell GF. Functionality of a Damaged Steel Truss Bridge Strengthened with Post-Tensioned CFRP Tendons. [Internet] [Thesis]. North Dakota State University; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10365/26559.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Brunell GF. Functionality of a Damaged Steel Truss Bridge Strengthened with Post-Tensioned CFRP Tendons. [Thesis]. North Dakota State University; 2012. Available from: http://hdl.handle.net/10365/26559
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Illinois – Urbana-Champaign
24.
Vargas Herrera, Annia Maria.
Generation and biological collection efficiency of MS2 bioaerosol for the evaluation of aerosol filtration devices.
Degree: MS, 0231, 2013, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/45639
► Exposure to bioaerosol in indoor environments is associated with adverse health effects. There is need to develop control devices to separate bioaerosols from gas streams…
(more)
▼ Exposure to bioaerosol in indoor environments is associated with adverse health effects.
There is need to develop control devices to separate bioaerosols from gas streams in heating and
ventilation systems to protect human health and enhance national security. The goal of this
research is to develop an experimental setup to evaluate the virus removal efficiency of an
electrothermally regenerated activated
carbon fiber cloth (ACFC) filter. MS2 bacteriophage was
used as a model virus. Three tasks were conducted. The first task involved the development of a
modified Liquid Sparging Aerosolizer (LSA) generator, which was fabricated to produce a stable
supply of tested bioaerosol. The second task involved the determination of the biological
collection efficiency of the SKC BioSampler for bacteriophage MS2. The BioSampler is used to
characterize the biological removal efficiency of the ACFC filter by capturing the bioaerosol in a
liquid medium before and after the ACFC filter. The biological collection efficiency of the
BioSampler was calculated based on the results of infectivity assay. A 100 kDalton membrane
was used to collect aerosolized MS2 particles at the inlet of the BioSampler. Infectivity assay
was used to determine the infectious MS2 particles on the membrane filter and in the collection
media of the BioSampler. Under 1 slpm (standard liter per minute) (20 °C, 1 atm) flow rate of
the filter, 6 slpm (20 °C, 1 atm) flow rate of the BioSampler, and 50% relative humidity (RH),
the biological collection efficiency calculated based on the results of the infectivity assays was
7.9 ± 0.42% based on three independent tests. The third task was to determine the ACFC’s
ability to physically remove nanometer diameter particles. ACFC was tested with 40 nm and 95
nm diameter PSL beads. A particle physical removal of 97 ± 0.07% of the particles was
measured based on the difference of the outlet and inlet particle number concentrations.
This research comprises the preparatory steps into the development of an indoor airfiltering
device. A stable bioaerosol generator was built and tested; the physical removal
efficiency of the filter and the biological collection efficiency of the BioSampler were quantified.
The low biological bioaerosol collection efficiencies found in this research provide an
opportunity for future research, which should involve the evaluation of the biological collection
efficiency under variable conditions of RH, flow rate, and viral concentration for different
nanodiameter sized viruses. Based on these results, a more accurate testing of the ACFC’s
removal efficiency for viral particles should be conducted. Finally, electrothermal heating
experiments must be performed, which will incorporate the evaluation of the amount of electrical
power applied to the ACFC filter and the effect of increased electrical power on the infectivity of
collected bioaerosols. All these experiments will test the ACFC’s capability to remove
bioaerosols from airstreams and thus become a potential…
Advisors/Committee Members: Nguyen, Helen (advisor), Rood, Mark J. (advisor).
Subjects/Keywords: Bioaerosol; MS2; Activated Carbon Fiber Cloth (ACFC)
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APA (6th Edition):
Vargas Herrera, A. M. (2013). Generation and biological collection efficiency of MS2 bioaerosol for the evaluation of aerosol filtration devices. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/45639
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Vargas Herrera, Annia Maria. “Generation and biological collection efficiency of MS2 bioaerosol for the evaluation of aerosol filtration devices.” 2013. Thesis, University of Illinois – Urbana-Champaign. Accessed February 27, 2021.
http://hdl.handle.net/2142/45639.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Vargas Herrera, Annia Maria. “Generation and biological collection efficiency of MS2 bioaerosol for the evaluation of aerosol filtration devices.” 2013. Web. 27 Feb 2021.
Vancouver:
Vargas Herrera AM. Generation and biological collection efficiency of MS2 bioaerosol for the evaluation of aerosol filtration devices. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2013. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2142/45639.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Vargas Herrera AM. Generation and biological collection efficiency of MS2 bioaerosol for the evaluation of aerosol filtration devices. [Thesis]. University of Illinois – Urbana-Champaign; 2013. Available from: http://hdl.handle.net/2142/45639
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of New Mexico
25.
Soliman, Eslam.
New generation fiber reinforced polymer composites incorporating carbon nanotubes.
Degree: Civil Engineering, 2012, University of New Mexico
URL: http://hdl.handle.net/1928/17505
► The last five decades observed an increasing use of fiber reinforced polymer(FRP) composites as alternative construction materials for aerospace and infrastructure. The high specific strength…
(more)
▼ The last five decades observed an increasing use of
fiber reinforced polymer(FRP) composites as alternative construction materials for aerospace and infrastructure. The high specific strength of FRP attracted its use as non-corrosive reinforcement. However, FRP materials were characterized with a relatively low ductility and low shear strength compared with steel reinforcement. On the other hand,
carbon nanotubes (CNTs) have been introduced in the last decade as a material with minimal defect that is capable of increasing the mechanical properties of polymer matrices. This dissertation reports experimental investigations on the use of multi-walled
carbon nanotubes (MWCNTs) to produce a new generation of FRP composites. The experiments showed significant improvements in the flexure properties of the nanocomposite when functionalized MWCNTs were used. In addition, MWCNTs were used to produce FRP composites in order to examine static, dynamic, and creep behavior. The MWCNTs improved the off-axis tension, off-axis flexure, FRP lap shear joint responses. In addition, they reduced the creep of FRP-concrete interface, enhanced the fracture toughness, and altered the impact resistance significantly. In general, the MWCNTs are found to affect the behavior of the FRP composites when matrix failure dominates the behavior. The improvement in the mechanical response with the addition of low contents of MWCNTs would benefit many industrial and military applications such as strengthening structures using FRP composites, composite pipelines, aircrafts,and armored vehicles.
Advisors/Committee Members: Taha, Mahmoud Reda, Maji, Arup, Shen, Yu Lin, Al-Haik, Marwan, Murphey, Thomas.
Subjects/Keywords: Carbon fiber-reinforced plastics; Nanotubes; Nanocomposites (Materials)
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APA (6th Edition):
Soliman, E. (2012). New generation fiber reinforced polymer composites incorporating carbon nanotubes. (Doctoral Dissertation). University of New Mexico. Retrieved from http://hdl.handle.net/1928/17505
Chicago Manual of Style (16th Edition):
Soliman, Eslam. “New generation fiber reinforced polymer composites incorporating carbon nanotubes.” 2012. Doctoral Dissertation, University of New Mexico. Accessed February 27, 2021.
http://hdl.handle.net/1928/17505.
MLA Handbook (7th Edition):
Soliman, Eslam. “New generation fiber reinforced polymer composites incorporating carbon nanotubes.” 2012. Web. 27 Feb 2021.
Vancouver:
Soliman E. New generation fiber reinforced polymer composites incorporating carbon nanotubes. [Internet] [Doctoral dissertation]. University of New Mexico; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1928/17505.
Council of Science Editors:
Soliman E. New generation fiber reinforced polymer composites incorporating carbon nanotubes. [Doctoral Dissertation]. University of New Mexico; 2012. Available from: http://hdl.handle.net/1928/17505
California State University – Sacramento
26.
Butler, Adalbert E.
Peridynamic prediction of compression and impact strength of carbon fiber reinforced plastic panels.
Degree: MS, Mechanical Engineeering, 2013, California State University – Sacramento
URL: http://hdl.handle.net/10211.9/2048
► Peridynamic theory is an alternative theory of continuum mechanics that utilizes integral equations in place of problematic spatial derivatives in areas of material discontinuity. By…
(more)
▼ Peridynamic theory is an alternative theory of continuum mechanics that utilizes integral
equations in place of problematic spatial derivatives in areas of material discontinuity. By
doing so, specialized techniques required to correct for computational limitations are
avoided and damage propagation and failure can be predicted. Two studies of
carbon
fiber reinforced plastic flat laminates with area impact damage and with central hole
under a compressive load until failure are examined here. The peridynamic analysis of
the structure is compared qualitatively and quantitatively against an equivalent test
specimen from proprietary sources. The predicted failure loads as well as the failure
modes are in close agreement with empirical observations. The study herein demonstrates
the validity of using peridynamics in analyzing complex composite structures.
Advisors/Committee Members: Holl, Susan L..
Subjects/Keywords: CAI; Compression after impact; Carbon fiber panel
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APA (6th Edition):
Butler, A. E. (2013). Peridynamic prediction of compression and impact strength of carbon fiber reinforced plastic panels. (Masters Thesis). California State University – Sacramento. Retrieved from http://hdl.handle.net/10211.9/2048
Chicago Manual of Style (16th Edition):
Butler, Adalbert E. “Peridynamic prediction of compression and impact strength of carbon fiber reinforced plastic panels.” 2013. Masters Thesis, California State University – Sacramento. Accessed February 27, 2021.
http://hdl.handle.net/10211.9/2048.
MLA Handbook (7th Edition):
Butler, Adalbert E. “Peridynamic prediction of compression and impact strength of carbon fiber reinforced plastic panels.” 2013. Web. 27 Feb 2021.
Vancouver:
Butler AE. Peridynamic prediction of compression and impact strength of carbon fiber reinforced plastic panels. [Internet] [Masters thesis]. California State University – Sacramento; 2013. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10211.9/2048.
Council of Science Editors:
Butler AE. Peridynamic prediction of compression and impact strength of carbon fiber reinforced plastic panels. [Masters Thesis]. California State University – Sacramento; 2013. Available from: http://hdl.handle.net/10211.9/2048
Kansas State University
27.
Parandoush, Pedram.
Additive
manufacturing of high-strength continuous fiber reinforced polymer
composites.
Degree: PhD, Department of Industrial &
Manufacturing Systems Engineering, 2019, Kansas State University
URL: http://hdl.handle.net/2097/40236
► Additive manufacturing (AM), also referred to as 3D printing, of polymer-fiber composites has transformed AM into a robust manufacturing paradigm and enabled producing highly customized…
(more)
▼ Additive manufacturing (AM), also referred to as 3D
printing, of polymer-
fiber composites has transformed AM into a
robust manufacturing paradigm and enabled producing highly
customized parts with significantly improved mechanical properties
compared to un-reinforced polymers. 3D printing of continuous
carbon fiber reinforced thermoplastics (CFRTP) composites is
increasingly under development owing to its unparalleled
flexibility of manufacturing 3D structures over traditional
manufacturing processes. However, key issues, such as weak
interlayer bonding, voids between beads and layers, and low volume
ratio of
carbon fiber, in the mainstream fused deposition modeling
(FDM) and extrusion suppress the applications of these techniques
in mission-critical applications, such as aerospace and defense
industries. In this work, we proposed a new laser assisted AM
method that utilizes prepreg composites with continuous
fiber
reinforcement as feedstock to fabricate 3D objects by implementing
laser assisted bonding and laser cutting. This technique is
inspired by laminated object manufacturing (LOM), for AM of
continuous CFRTPs using prepreg composite sheets. AM of continuous
glass and
carbon fiber reinforced thermoplastic composites is
demonstrated using this technique. The continuous
fiber reinforced
prepreg is laser cut and laser bonded layer upon layer to produce
3D composite objects. Microstructure and mechanical properties
(strength, modulus, interfacial, and shear properties) of the
additively manufactured continuous
fiber composites are studied and
compared to other additive and conventional manufacturing methods.
The interlayer properties of these additively manufactured
composites was superior to other AM technologies, resulting to an
excellent mechanical properties relative to other AM techniques.
The microstructure analysis, by micro computed tomography (CT)
scans, scanning electron microscopy (SEM), and optical microscopy,
showed low void content and full consolidation of prepreg layers.
The temperature at the material interface during the 3D process is
crucial to achieve a strong bonding strength. This temperature can
be predicted via the developed finite element (FE) heat transfer
model in this work. This numerical model is able to predict the
temperature history during the laser bonding process with great
accuracy when compared to the experimental values. The surface
quality of the additively manufactured CFRTPs were also studied and
compared with the FDM technology. In addition, mechanical finishing
methods, namely CNC milling and rotary ultrasonic machining (RUM),
were employed to improve the surface quality of the 3D printed
composites and drill precise holes in the structures. Overall, the
proposed AM method can be broadly beneficial for industries
requiring high performance and lightweight structural materials
with complex geometries. This method is also easily scalable for
high volume productions and could additionally reduce the waste
associated with current CFRTP production techniques and improve the…
Advisors/Committee Members: Dong Lin.
Subjects/Keywords: Carbon
fiber;
Composite; Additive
manufacturing; 3D
printing
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Parandoush, P. (2019). Additive
manufacturing of high-strength continuous fiber reinforced polymer
composites. (Doctoral Dissertation). Kansas State University. Retrieved from http://hdl.handle.net/2097/40236
Chicago Manual of Style (16th Edition):
Parandoush, Pedram. “Additive
manufacturing of high-strength continuous fiber reinforced polymer
composites.” 2019. Doctoral Dissertation, Kansas State University. Accessed February 27, 2021.
http://hdl.handle.net/2097/40236.
MLA Handbook (7th Edition):
Parandoush, Pedram. “Additive
manufacturing of high-strength continuous fiber reinforced polymer
composites.” 2019. Web. 27 Feb 2021.
Vancouver:
Parandoush P. Additive
manufacturing of high-strength continuous fiber reinforced polymer
composites. [Internet] [Doctoral dissertation]. Kansas State University; 2019. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2097/40236.
Council of Science Editors:
Parandoush P. Additive
manufacturing of high-strength continuous fiber reinforced polymer
composites. [Doctoral Dissertation]. Kansas State University; 2019. Available from: http://hdl.handle.net/2097/40236
Kansas State University
28.
Curnutt, Austin.
Research on
the mechanics of CFRP composite lap joints.
Degree: MS, Department of Architectural
Engineering, 2017, Kansas State University
URL: http://hdl.handle.net/2097/38191
► For this thesis, research was performed on CFRP bonded composite lap-joints with one and two continuous laminas through the lap. Composite wraps used to retrofit…
(more)
▼ For this thesis, research was performed on CFRP bonded
composite lap-joints with one and two continuous laminas through
the lap. Composite wraps used to retrofit existing structures use
lap joints to maintain their integrity. The use of composites for
retrofitting structures has many advantages over traditional
methods, such as steel jacketing, and is becoming more widely
accepted in the structural engineering industry. While much
literature exists documenting the performance of composite wraps as
a whole when applied to concrete columns, less information is
available on the behavior of the lap-joint of the wrap. Developing
a better understanding of how the lap-joint behaves will help
researchers further understand composite column wraps. This
research sought to determine what affect continuous middle laminas
may have on the stiffness of lap joints and whether or not stress
concentrations exist in the lap-joint due to a change in
stiffness.
Advisors/Committee Members: Donald J. Phillippi.
Subjects/Keywords: CFRP;
Lap-joint; Carbon
fiber reinforced polymer
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APA (6th Edition):
Curnutt, A. (2017). Research on
the mechanics of CFRP composite lap joints. (Masters Thesis). Kansas State University. Retrieved from http://hdl.handle.net/2097/38191
Chicago Manual of Style (16th Edition):
Curnutt, Austin. “Research on
the mechanics of CFRP composite lap joints.” 2017. Masters Thesis, Kansas State University. Accessed February 27, 2021.
http://hdl.handle.net/2097/38191.
MLA Handbook (7th Edition):
Curnutt, Austin. “Research on
the mechanics of CFRP composite lap joints.” 2017. Web. 27 Feb 2021.
Vancouver:
Curnutt A. Research on
the mechanics of CFRP composite lap joints. [Internet] [Masters thesis]. Kansas State University; 2017. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2097/38191.
Council of Science Editors:
Curnutt A. Research on
the mechanics of CFRP composite lap joints. [Masters Thesis]. Kansas State University; 2017. Available from: http://hdl.handle.net/2097/38191
Oklahoma State University
29.
Babu, Libin Kaleeluvilayil.
Use of AFM Indentation to Quantify Mechanical Properties of the Interphase Region in Fiber-Reinforced Composites.
Degree: Mechanical and Aerospace Engineering, 2019, Oklahoma State University
URL: http://hdl.handle.net/11244/323368
► Interphase is the region in the vicinity of the reinforcing fiber in the polymer composites with properties distinct from the bulk matrix. Investigation of these…
(more)
▼ Interphase is the region in the vicinity of the reinforcing
fiber in the polymer composites with properties distinct from the bulk matrix. Investigation of these nano- and micro interphase regions have been done using conventional indentation techniques, followed by closed-form solutions applicable to the indentation in a semi-infinite space. However, due to the presence of the
fiber the interphase region can be considered only as a semi-infinite space with rigid constraint. An integrated approach using AFM (Atomic Force Microscopy) based indentation and FEA (Finite Element Analysis) is used to investigate the effect of the
fiber constraint on the mechanical properties of the interphase region. Obtained results indicate that the thickness of the interphase region is approximately 250 nm, based on the gradient in the elastic modulus as a function of radial distance from the
fiber. 3D FEA using an elasto-plastic material model indicates that the
fiber constraint effect is considerable in the region less than 40 nm away from the
fiber. The time-dependent behavior of the interphase region is studied using a constant displacement approach, and the distinct viscoelastic response of the interphase region is observed as a function of the radial distance to the
fiber. FEA using a linear viscoelastic material model shows that the influence of
fiber constraint on the evaluation of the viscoelastic properties is distinguishable only within 20 nm away from the
fiber. Due to the limited extent of influence of
fiber constraint effect, the distinct behavior of the interphase region in terms of elastic and viscoelastic properties is confirmed. Additionally, it is shown that consideration of an axisymmetry assumption for modeling the interphase region leads to an overestimation of the properties of the region. This technique is further implemented to demonstrate the effect of UV irradiation on the interphase region. Methodical analysis of the data indicates that the response of epoxy to UV irradiation is influenced by the proximity to the reinforcement and
carbon fiber reinforcement hinders the photo-degradation of epoxy. Furthermore, the influence of the thermal mismatch between the
fiber and the matrix on the formation of the interphase and the effect of post-curing are examined using the approach considered in this study. Results indicate that the presence of thermal stresses greatly impact the width of the interphase region and its behavior.
Advisors/Committee Members: Singh, Raman P. (advisor), Sallam, Khaled A. (committee member), Wang, Shuodao (committee member), Kim, DoYoung (committee member).
Subjects/Keywords: atomic force microscopy; carbon fiber; composites; interphase
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APA (6th Edition):
Babu, L. K. (2019). Use of AFM Indentation to Quantify Mechanical Properties of the Interphase Region in Fiber-Reinforced Composites. (Thesis). Oklahoma State University. Retrieved from http://hdl.handle.net/11244/323368
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Babu, Libin Kaleeluvilayil. “Use of AFM Indentation to Quantify Mechanical Properties of the Interphase Region in Fiber-Reinforced Composites.” 2019. Thesis, Oklahoma State University. Accessed February 27, 2021.
http://hdl.handle.net/11244/323368.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Babu, Libin Kaleeluvilayil. “Use of AFM Indentation to Quantify Mechanical Properties of the Interphase Region in Fiber-Reinforced Composites.” 2019. Web. 27 Feb 2021.
Vancouver:
Babu LK. Use of AFM Indentation to Quantify Mechanical Properties of the Interphase Region in Fiber-Reinforced Composites. [Internet] [Thesis]. Oklahoma State University; 2019. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/11244/323368.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Babu LK. Use of AFM Indentation to Quantify Mechanical Properties of the Interphase Region in Fiber-Reinforced Composites. [Thesis]. Oklahoma State University; 2019. Available from: http://hdl.handle.net/11244/323368
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
30.
Tas, Jesse (author).
Float, the next generation hydrofoil.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:7d1bba33-c2c6-428d-af35-2a2e3603f019
► This project focusses on the creation of a hydrofoil specifically for the windsurfing market. The assigment was created for PWsurfsport. PWsurfsport is a windsurfing company…
(more)
▼ This project focusses on the creation of a hydrofoil specifically for the windsurfing market. The assigment was created for PWsurfsport. PWsurfsport is a windsurfing company based in Leiden. The company has two subsidiary companies called Tribal and KA. Sails. Tribal produces windsurfing fins and KA produces windsurf sails. Tribal wanted to add a new product to its product portfolio. In this case, the key objective for this project was to create a windsurfing hydrofoil, fitting the current product portfolio of the company and the future windsurfing market.
Integrated Product Design
Advisors/Committee Members: Tempelman, Erik (mentor), Baha, Ehsan (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Hydrofoil; Carbon Fiber; Windsurfing; Master thesis
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APA (6th Edition):
Tas, J. (. (2019). Float, the next generation hydrofoil. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:7d1bba33-c2c6-428d-af35-2a2e3603f019
Chicago Manual of Style (16th Edition):
Tas, Jesse (author). “Float, the next generation hydrofoil.” 2019. Masters Thesis, Delft University of Technology. Accessed February 27, 2021.
http://resolver.tudelft.nl/uuid:7d1bba33-c2c6-428d-af35-2a2e3603f019.
MLA Handbook (7th Edition):
Tas, Jesse (author). “Float, the next generation hydrofoil.” 2019. Web. 27 Feb 2021.
Vancouver:
Tas J(. Float, the next generation hydrofoil. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Feb 27].
Available from: http://resolver.tudelft.nl/uuid:7d1bba33-c2c6-428d-af35-2a2e3603f019.
Council of Science Editors:
Tas J(. Float, the next generation hydrofoil. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:7d1bba33-c2c6-428d-af35-2a2e3603f019
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Open Access Theses and Dissertations
