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University of Ottawa
1.
Badripour, Yousef.
Characterization of Fibre Reinforcements for Non-structural Composite Parts
.
Degree: 2018, University of Ottawa
URL: http://hdl.handle.net/10393/38430 
► Fibre reinforced composite materials have attracted attention from industry and academia due to their high specific stiffness and strength. Commonly used manufacturing processes include the…
(more)
▼ Fibre reinforced composite materials have attracted attention from industry and academia due to their high specific stiffness and strength. Commonly used manufacturing processes include the Liquid Composite Moulding (LCM) group of processes, where a liquid polymer resin impregnates a dry preform that is prepared in advance. The consistency of the resin infusion process and properties of the final composite are highly dependent on preform quality and reproducibility. Preform quality, in turn, depends on a process called draping. This work aims at understanding and developing quantitative knowledge of key elements of reinforcement behaviour during preforming.
Testing characterization methods for dry fabrics are introduced and discussed. Moreover, the thesis probes relations between fabric properties such as their architecture and fibre type, and elements of their draping and preforming behaviour such as bending stiffness and in-plane shear properties of the dry fabrics.
Most materials used in this work were selected by the industrial partner, Hutchinson Aerospace and Industry, based in Montreal. Some experiments were conducted using Hutchinson’s characterization devices, which are introduced in the relevant chapters.
Subjects/Keywords: Composites
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APA (6th Edition):
Badripour, Y. (2018). Characterization of Fibre Reinforcements for Non-structural Composite Parts
. (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/38430
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):
Badripour, Yousef. “Characterization of Fibre Reinforcements for Non-structural Composite Parts
.” 2018. Thesis, University of Ottawa. Accessed February 27, 2021.
http://hdl.handle.net/10393/38430.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Badripour, Yousef. “Characterization of Fibre Reinforcements for Non-structural Composite Parts
.” 2018. Web. 27 Feb 2021.
Vancouver:
Badripour Y. Characterization of Fibre Reinforcements for Non-structural Composite Parts
. [Internet] [Thesis]. University of Ottawa; 2018. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10393/38430.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Badripour Y. Characterization of Fibre Reinforcements for Non-structural Composite Parts
. [Thesis]. University of Ottawa; 2018. Available from: http://hdl.handle.net/10393/38430
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
2.
McLendon, Wesley R.
A Multiscale Framework for the Characterization of Damage in Textile Composites Under Thermomechanical Loads.
Degree: 2013, Texas Digital Library
URL: http://hdl.handle.net/1969;
http://hdl.handle.net/2249.1/66685
► This work examines composite failure at multiple scales. The ???rst scale that is examined is the ???ber-matrix scale, where ???bers and matrix are discretely modeled.…
(more)
▼ This work examines composite failure at multiple scales. The ???rst scale that is examined is the ???ber-matrix scale, where ???bers and matrix are discretely modeled. A model is developed at this scale which includes randomness in the ???ber positions. This randomness is found to signi???cantly in???uence the stress ???eld and resulting failure that occurs under thermo mechanical loads as compared to ???ber-matrix microstructures with regular arrays of ???bers. The ???ber-matrix model is utilized to characterize variability and temperature dependence of the composite strength arising from microstructural randomness and the presence of thermally induced stresses.
The second scale that is examined is that of a textile unit cell. Failure initiation behavior is examined for a variety of thermo mechanical loadings at this scale, and it is found that failure tends to initiate in a limited number of ways for a wide variety of loadings. A new progressive failure model is then examined for the textile unit cell. This model utilizes cohesive interface elements in the tows, neat matrix pockets, and tow and matrix interfaces to account for crack opening in the textile, as well as a continuum damage model to account for di???use damage in the tows. Variability and temperature dependence of the transverse tow strength is introduced by specifying varying cohesive strengths in the intra-tow cohesive zones using a Weibull distribution characterized using the random ???ber-matrix model. Progressive failure analyses are then performed for the textile unit cell under a variety of thermomechanical loads, and the resulting behaviors are compared to identify characteristic modes of damage development and their e???ect on the textile response.
A continuum damage model for the textile material, which can be applied to engineering structures, is developed based on the characteristic damage modes observed in the textile unit cell analyses. This model tracks the evolution of each characteristic mode of damage based on the structural-scale stress and predicts the degradation in the textile response as a result of this damage. The ability of this model to predict the textile???s response under various damage-inducing loads is then compared to the response obtained from textile unit cell progressive failure analysis, and both models are found to be in good agreement for most loadings.
Advisors/Committee Members: Whitcomb, John D (advisor).
Subjects/Keywords: Composites
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APA (6th Edition):
McLendon, W. R. (2013). A Multiscale Framework for the Characterization of Damage in Textile Composites Under Thermomechanical Loads. (Thesis). Texas Digital Library. Retrieved from http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66685
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):
McLendon, Wesley R. “A Multiscale Framework for the Characterization of Damage in Textile Composites Under Thermomechanical Loads.” 2013. Thesis, Texas Digital Library. Accessed February 27, 2021.
http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66685.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
McLendon, Wesley R. “A Multiscale Framework for the Characterization of Damage in Textile Composites Under Thermomechanical Loads.” 2013. Web. 27 Feb 2021.
Vancouver:
McLendon WR. A Multiscale Framework for the Characterization of Damage in Textile Composites Under Thermomechanical Loads. [Internet] [Thesis]. Texas Digital Library; 2013. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66685.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
McLendon WR. A Multiscale Framework for the Characterization of Damage in Textile Composites Under Thermomechanical Loads. [Thesis]. Texas Digital Library; 2013. Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66685
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
3.
Vasudevan, Sugeetha.
Investigations on mechanical property -microstructure
correlations in CMC Coatings.
Degree: PhD, Materials Science, 2016, Brown University
URL: https://repository.library.brown.edu/studio/item/bdr:674151/
► Abstract of “Investigations on mechanical property - microstructure correlations in CMC Coatings” by Sugeetha Vasudevan, Ph.D., Brown University, May 2016 Carbon nanotubes (CNTs) are being…
(more)
▼ Abstract of “Investigations on mechanical property -
microstructure correlations in CMC Coatings” by Sugeetha Vasudevan,
Ph.D., Brown University, May 2016 Carbon nanotubes (CNTs) are being
explored as reinforcements to toughen nanoscale ceramics in modern
day applications however the direct investigation of CNT toughening
in nano-ceramics has been severely hampered by the challenges
inherent with studying fracture at small length scales. In this
study the challenges faced during composite fabrication are
addressed for two ceramic matrices
composites - CNT reinforced
silicon nitride and nano-crystalline diamond (NCD). A half wafer
method is used to determine the fracture toughness of the CNT
reinforced NCD films, whereas a focused ion beam (FIB) milled
micro-cantilever test method has been employed to illustrate the
changes in fracture toughness with changes in microstructure of the
amorphous silicon nitride matrix composite coatings with particular
emphasis on the influence of nano-porosity’s presence. Additionally
R curve behavior, a definitive evidence of CNT toughening is shown
to exist in the amorphous silicon nitride composite
coatings.
Advisors/Committee Members: Sheldon, Brian (Director), Bower, Allan (Reader), Padture, Nitin (Reader).
Subjects/Keywords: Composites
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APA (6th Edition):
Vasudevan, S. (2016). Investigations on mechanical property -microstructure
correlations in CMC Coatings. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:674151/
Chicago Manual of Style (16th Edition):
Vasudevan, Sugeetha. “Investigations on mechanical property -microstructure
correlations in CMC Coatings.” 2016. Doctoral Dissertation, Brown University. Accessed February 27, 2021.
https://repository.library.brown.edu/studio/item/bdr:674151/.
MLA Handbook (7th Edition):
Vasudevan, Sugeetha. “Investigations on mechanical property -microstructure
correlations in CMC Coatings.” 2016. Web. 27 Feb 2021.
Vancouver:
Vasudevan S. Investigations on mechanical property -microstructure
correlations in CMC Coatings. [Internet] [Doctoral dissertation]. Brown University; 2016. [cited 2021 Feb 27].
Available from: https://repository.library.brown.edu/studio/item/bdr:674151/.
Council of Science Editors:
Vasudevan S. Investigations on mechanical property -microstructure
correlations in CMC Coatings. [Doctoral Dissertation]. Brown University; 2016. Available from: https://repository.library.brown.edu/studio/item/bdr:674151/
Oklahoma State University
4.
Cyriac, Ajith James.
Metal Matrix Composites: History, Status, Factors and Future.
Degree: Mechanical & Aerospace Engineering, 2011, Oklahoma State University
URL: http://hdl.handle.net/11244/9914
► The history, status, and future of metal matrix composites are presented by evaluating the progression of available literature through time. The trends that existed and…
(more)
▼ The history, status, and future of metal matrix
composites are presented by evaluating the progression of available literature through time. The trends that existed and issues that still prevail are discussed and a prediction of the future for MMCs is presented. The factors that govern the performance of metal matrix
composites are also discussed. In many developed countries and in several developing countries there exists continued interest in MMCs. Researchers tried numerous combinations of matrices and reinforcements since work strictly on MMCs began in the 1950s. This led to developments for aerospace and defense applications, but resultant commercial applications were limited. The introduction of ceramic whiskers as reinforcement and the development of `in-situ' eutectics in the 1960s aided high temperature applications in aircraft engines. In the late 1970s the automobile industries started to take MMCs seriously. In the last 20 years, MMCs evolved from laboratories to a class of materials with numerous applications and commercial markets. After the collapse of the Berlin Wall, prevailing order in the world changed drastically. This effect was evident in the progression of metal matrix
composites. The internet connected the world like never before and tremendous information was available for researchers around the world. Globalization and the internet resulted in the transformation of the world to a more level playing field, and this effect is evident in the nature and source of research on metal matrix
composites happening around the world.
Advisors/Committee Members: Hanan, Jay C. (advisor), Harimkar, Sandip P. (committee member), Vaidyanathan, Ranji K. (committee member).
Subjects/Keywords: ceramics; composites; metal matrix composites
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APA (6th Edition):
Cyriac, A. J. (2011). Metal Matrix Composites: History, Status, Factors and Future. (Thesis). Oklahoma State University. Retrieved from http://hdl.handle.net/11244/9914
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):
Cyriac, Ajith James. “Metal Matrix Composites: History, Status, Factors and Future.” 2011. Thesis, Oklahoma State University. Accessed February 27, 2021.
http://hdl.handle.net/11244/9914.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Cyriac, Ajith James. “Metal Matrix Composites: History, Status, Factors and Future.” 2011. Web. 27 Feb 2021.
Vancouver:
Cyriac AJ. Metal Matrix Composites: History, Status, Factors and Future. [Internet] [Thesis]. Oklahoma State University; 2011. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/11244/9914.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Cyriac AJ. Metal Matrix Composites: History, Status, Factors and Future. [Thesis]. Oklahoma State University; 2011. Available from: http://hdl.handle.net/11244/9914
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Manchester
5.
Dhiman, Sarvesh Singh.
Effect of Number of Layers and Binder Tow Size on
Mechanical Properties of 3D Woven Composites.
Degree: 2016, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:300684a
► Composite structures are being increasingly used in a wide range of industries due to their high stiffness and strength to weight ratios compared to traditional…
(more)
▼ Composite structures are being increasingly used in
a wide range of industries due to their high stiffness and strength
to weight ratios compared to traditional materials such as metals
and alloys. However, due to the anisotropic nature of composite
materials and complex architecture of textile
composites, the
prediction of their mechanical properties presents a greater
challenge than that of traditional materials. This thesis presents
a multiscale modelling approach to predict the elastic and damage
behaviour of 3D woven
composites, which is based on Representative
Volume Elements (RVEs) of 3D weaves and implemented in ABAQUS.
Also, an experimental investigation into the tensile, compressive,
impact and compression after impact properties of 3D woven
composites with different binder tow sizes and number of warp
layers is undertaken and the tensile properties are found to be in
good agreement with the predictions obtained from the
model.Firstly, a literature review is carried out identifying
current models and limitations of these models. Secondly, the
modelling methodology is described including boundary conditions
and implementation of damage models using a user defined subroutine
in ABAQUS/Explicit. Following this, the experimental investigation
is presented and the results are compared to the predictions.
Recommendations for future work are suggested at the end of the
thesis which would further develop the model.
Advisors/Committee Members: WILKINSON, ARTHUR A, Potluri, Prasad, Wilkinson, Arthur.
Subjects/Keywords: Composites; FEA
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APA ·
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Manager
APA (6th Edition):
Dhiman, S. S. (2016). Effect of Number of Layers and Binder Tow Size on
Mechanical Properties of 3D Woven Composites. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:300684a
Chicago Manual of Style (16th Edition):
Dhiman, Sarvesh Singh. “Effect of Number of Layers and Binder Tow Size on
Mechanical Properties of 3D Woven Composites.” 2016. Doctoral Dissertation, University of Manchester. Accessed February 27, 2021.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:300684a.
MLA Handbook (7th Edition):
Dhiman, Sarvesh Singh. “Effect of Number of Layers and Binder Tow Size on
Mechanical Properties of 3D Woven Composites.” 2016. Web. 27 Feb 2021.
Vancouver:
Dhiman SS. Effect of Number of Layers and Binder Tow Size on
Mechanical Properties of 3D Woven Composites. [Internet] [Doctoral dissertation]. University of Manchester; 2016. [cited 2021 Feb 27].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:300684a.
Council of Science Editors:
Dhiman SS. Effect of Number of Layers and Binder Tow Size on
Mechanical Properties of 3D Woven Composites. [Doctoral Dissertation]. University of Manchester; 2016. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:300684a
University of Waterloo
6.
Ganesarajan, Dinesha.
Engineered-Polysaccharide Reinforced Hybrid Composites for Automotive Applications.
Degree: 2020, University of Waterloo
URL: http://hdl.handle.net/10012/15434
► In recent years, the automotive industry has undergone severe changes that challenges their conventional methods of mass vehicle production. This is due to many factors…
(more)
▼ In recent years, the automotive industry has undergone severe changes that challenges their conventional methods of mass vehicle production. This is due to many factors that include legislation that demand for increase in fuel economy and public sentiment for environmental sustainability. Therefore, one of the most prominent solutions to combat the factors mentioned above is to rethink material utilization in automobiles. The purpose of this thesis is to reduce the material weight and increase the environmental sustainability of polypropylene composites for body interior and under-the-hood applications, specifically replacing inorganic sources with naturally, biodegradable filler materials.
Two polysaccharide morphologies were explored in this study which includes DuPont’s Nuvolve™ (micro-polysaccharide) and nanocellulose. The natural fillers were incorporated with glass fiber in a polypropylene matrix to yield hybrid composites. The polysaccharide & glass fiber loadings were varied with the total filler concentration not exceeding 30 wt.%. Subsequently mechanical, thermal, rheological and morphological properties were evaluated and compared to Ford Motor Company’s material specification for body interior and under-the-hood applications. The composites were prepared through twin screw extrusion and injection molding where a universal testing machine was used to assess the mechanical properties. Thermal properties were analyzed using thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC). Melt rheology was evaluated using a parallel-plate controlled strained rheometer. Scanning electron microscope (SEM) was used to study the filler-matrix interface of the hybrid composites.
The results showed that for the micro-polysaccharide (Nuvolve™) hybrid composites a density reduction of up to 13% was achievable with improvements to tensile strength and impact strength compared to Ford Motor Company’s material specification. The addition of Nuvolve™ negatively affected the thermal stability of the composites due to the low thermal stability of the polysaccharide. Additionally, the analysis of the thermal transitions of the composites showed that the Nuvolve™ did not have a nucleating effect to enhance crystallization which in turn improves part-production. SEM images showed good filler distribution of Nuvolve™. Nuvolve™ revealed areas of poor dispersion seen as agglomeration up to 100µm; which can lead to poor transfer of stress between filler and the polymer matrix. Glass fibers were also well distributed in the polypropylene matrix with typical fracture mechanisms present such as fiber-pull out.
Nanocellulose reinforced hybrid composites showed a greater density reduction above 15% compared to Ford Motor Company’s material specification. The optimal performing composite contained 2.5 wt.% of nanocellulose and 10 wt.% of glass fiber yielding a total filler content of only 12.5 wt.%. The mechanical properties of the optimal formulation agreed with most of the material specification outlined by…
Subjects/Keywords: composites; sustainability
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APA (6th Edition):
Ganesarajan, D. (2020). Engineered-Polysaccharide Reinforced Hybrid Composites for Automotive Applications. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/15434
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):
Ganesarajan, Dinesha. “Engineered-Polysaccharide Reinforced Hybrid Composites for Automotive Applications.” 2020. Thesis, University of Waterloo. Accessed February 27, 2021.
http://hdl.handle.net/10012/15434.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ganesarajan, Dinesha. “Engineered-Polysaccharide Reinforced Hybrid Composites for Automotive Applications.” 2020. Web. 27 Feb 2021.
Vancouver:
Ganesarajan D. Engineered-Polysaccharide Reinforced Hybrid Composites for Automotive Applications. [Internet] [Thesis]. University of Waterloo; 2020. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10012/15434.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ganesarajan D. Engineered-Polysaccharide Reinforced Hybrid Composites for Automotive Applications. [Thesis]. University of Waterloo; 2020. Available from: http://hdl.handle.net/10012/15434
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Université de Sherbrooke
7.
Mighri, Frej.
Étude du comportement viscoélastique d'un composite carbon/époxyde-bismaléimide "IM6/5245C.
Degree: 1989, Université de Sherbrooke
URL: http://hdl.handle.net/11143/16277
► Le présent travail traite du comportement viscoélastique à long terme d'un composite carbone/époxyde-bismaléimide (IM6/5245C). Il s'agit dans un premier temps d'une étude théorique sur le…
(more)
▼ Le présent travail traite du comportement viscoélastique à long terme d'un composite carbone/époxyde-bismaléimide (IM6/5245C). Il s'agit dans un premier temps d'une étude théorique sur le sujet qui traite des relations techniques contrainte-déformation ainsi que des différentes pour étudier le comportement en cisaillement des matériaux
composites. La théorie de la viscoélasticité est par la suite exposée pour mettre en évidence les différentes techniques de prévision du comportement à long terme à partir d'essais de courtes durées. Dans un deuxième temps, on élabore un programme expérimental qui comporté une série d'essais de fluage d'une durée de deux heures (sous charge constante). Les échantillons utilisés sont des éprouvettes unidirectionnelles dont les fibres sont orientées à 0°, 10° et 90° par rapport à la direction de la sollicitation. La caractérisation des propriétés viscoélastiques à long terme est rendue possible grâce à la méthode des variables réduites nommée TTSSP (principe de superposition tempstempérature-contrainte). Par une simple translation de l'échelle des temps appélée facteur de translation, cette technique permet de construire les courbes décrivant le comportement viscoélastique à long terme du composite à l'aide de données expérimentales recueillies durant de courts intervalles.
Advisors/Committee Members: Roy, Clermont (advisor).
Subjects/Keywords: Composites
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APA (6th Edition):
Mighri, F. (1989). Étude du comportement viscoélastique d'un composite carbon/époxyde-bismaléimide "IM6/5245C. (Masters Thesis). Université de Sherbrooke. Retrieved from http://hdl.handle.net/11143/16277
Chicago Manual of Style (16th Edition):
Mighri, Frej. “Étude du comportement viscoélastique d'un composite carbon/époxyde-bismaléimide "IM6/5245C.” 1989. Masters Thesis, Université de Sherbrooke. Accessed February 27, 2021.
http://hdl.handle.net/11143/16277.
MLA Handbook (7th Edition):
Mighri, Frej. “Étude du comportement viscoélastique d'un composite carbon/époxyde-bismaléimide "IM6/5245C.” 1989. Web. 27 Feb 2021.
Vancouver:
Mighri F. Étude du comportement viscoélastique d'un composite carbon/époxyde-bismaléimide "IM6/5245C. [Internet] [Masters thesis]. Université de Sherbrooke; 1989. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/11143/16277.
Council of Science Editors:
Mighri F. Étude du comportement viscoélastique d'un composite carbon/époxyde-bismaléimide "IM6/5245C. [Masters Thesis]. Université de Sherbrooke; 1989. Available from: http://hdl.handle.net/11143/16277
Université de Sherbrooke
8.
Bouksour, Otmane.
Analyse par éléments finis des effets de bord dans les composites stratifiés.
Degree: 1990, Université de Sherbrooke
URL: http://hdl.handle.net/11143/16470
► Les effets de bords dans les composites stratifiés ont été analysés avec une considération particulière de la singularité de contrainte. Deux approches très pratiques ont…
(more)
▼ Les effets de bords dans les
composites stratifiés ont été analysés avec une considération particulière de la singularité de contrainte. Deux approches très pratiques ont été proposées pour l'analyse de la singularité. La première approche utilise le raffinement de maillage et la méthode des moindres carrés, et la seconde est basée sur une analyse locale par éléments finis; des éléments spéciaux ont été proposés dans ce dernier cas. Une application des deux approches a été faite dans les cas du bord libre droit et du bord libre courbe (circulaire ou elliptique). Dans le cas du bord libre droit, les résultats d'études antérieures ont été retrouvés. Le cas du bord libre courbe a été plus difficile à analyser et des considérations de puissance d'ordinateur ont limité notre analyse; on a toutefois pu identifier une singularité de contrainte de même nature et de même ordre de grandeur qu'au bord libre droit. Cette singularité semble en outre être constante, sinon peu variable, le long du bord libre courbe. La dernière partie de cette étude porte sur l'utilisation des éléments finis singuliers dans une analyse globale des contraintes. Des éléments finis singuliers compatibles et complets ont été choisis ou mis au point, suivant le cas de bord libre, et ont été incorporés dans un maillage quadratique. L'utilisation des éléments singuliers conduit à des résultats au moins aussi précis que ceux d'un maillage quadratique fin; on a de plus une réduction importante du temps d'exécution et de l'espace-mémoire requis.
Advisors/Committee Members: Lahoud, Antoine E. (advisor).
Subjects/Keywords: Composites
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APA ·
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APA (6th Edition):
Bouksour, O. (1990). Analyse par éléments finis des effets de bord dans les composites stratifiés. (Doctoral Dissertation). Université de Sherbrooke. Retrieved from http://hdl.handle.net/11143/16470
Chicago Manual of Style (16th Edition):
Bouksour, Otmane. “Analyse par éléments finis des effets de bord dans les composites stratifiés.” 1990. Doctoral Dissertation, Université de Sherbrooke. Accessed February 27, 2021.
http://hdl.handle.net/11143/16470.
MLA Handbook (7th Edition):
Bouksour, Otmane. “Analyse par éléments finis des effets de bord dans les composites stratifiés.” 1990. Web. 27 Feb 2021.
Vancouver:
Bouksour O. Analyse par éléments finis des effets de bord dans les composites stratifiés. [Internet] [Doctoral dissertation]. Université de Sherbrooke; 1990. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/11143/16470.
Council of Science Editors:
Bouksour O. Analyse par éléments finis des effets de bord dans les composites stratifiés. [Doctoral Dissertation]. Université de Sherbrooke; 1990. Available from: http://hdl.handle.net/11143/16470
Université de Sherbrooke
9.
Dupont, Luc.
Étude du comportement mécanique d'un composite stratifié graphite/epoxy soumis à des sollicitations monotones et cycliques.
Degree: 1988, Université de Sherbrooke
URL: http://hdl.handle.net/11143/15896
► Le secteur des matériaux est un des secteurs clés de développement industriel. Parmi les nouveaux matériaux qui bénéficient d'un haut taux de croissance, on retrouve…
(more)
▼ Le secteur des matériaux est un des secteurs clés de développement industriel. Parmi les nouveaux matériaux qui bénéficient d'un haut taux de croissance, on retrouve les matériaux
composites à haute performance. Ces
composites à fibres longues possèdent des propriétés spécifiques (résistance, rigidité) très élevées. L'effet de bord, problème fréquemment rencontré dans les structures
composites, est relié à l'existence de contraintes interlaminaires aux bords libres des stratifiés. Ces contraintes interlaminaires peuvent engendrer un délaminage dans les stratifiés qui mènera rapidement à la ruine du matériau. Des études ont révélé qu'un choix judicieux de la séquence d'empilement des couches composant le stratifié permet de minimiser l'effet de bord. Une analyse théorique et expérimentale de l'effet de bord a été réalisée sur des
composites stratifiés fabriqués en graphite-époxy (IM6-5245C) et contenant 18 couches soit 8 à 0°, 4 à +45°, 4 à -45° et 2 à 90°. Dans la partie théorique de notre étude, on tente de déterminer avec l'aide d'outils analytiques, la séquence optimale de stratification permettant de minimiser l'effet de bord pour une sollicitation mécanique donnée (tension ou compression). À cette fin, deux méthodes d'analyse furent utilisées soit d'une part, la technique des éléments finis et d'autre part un modèle basé sur les incompatibilités de Poisson et d'influence mutuelle ainsi que sur les moments réactifs aux interfaces. Au total, dix-sept stratifiés ayant différentes stratifications ont été analysés. Ces stratifiés ont été classifiés par les deux techniques d'analyse selon leur susceptibilité à l'effet de bord. Les deux modèles ont conduit à des résultats similaires. Suite à cette analyse, trois stratifiés démontrant différents niveaux de sensibilité à l'effet de bord ont été retenus pour une étude expérimentale de leur comportement, de façon à vérifier la fiabilité des outils analytiques développés pour choisir les séquences optimales d'empilement. L'étude expérimentale comprenait une série d'essais statiques en tension et en compression en vue de déterminer les limites ultimes des trois stratifiés et de caractériser l'endommagement aux bords libres des éprouvettes produit par ces sollicitations. Une étude du comportement des trois stratifiés sous des sollicitations cycliques (spectre de charges dominé par la compression) a également été réalisée. Des classements des trois stratifiés ont été faits à partir des résultats expérimentaux. Une comparaison du classement des stratifiés prédit par la théorie et observé expérimentalement montre que la corrélation est douteuse à ce stade-ci. Une étude complexe mais plus détaillée de l'influence de chacun des paramètres considérés dans l'étude théorique s'impose. C'est-à-dire qu'on devra tenir compte dans les calculs: 1) de l'ensemble des contraintes interlaminaires ơx,ƭzx et ƭzy, ou 2) des incompatibilités de Poisson et d'influence mutuelle ainsi que des moments réactifs aux interfaces, en vue d'obtenir un modèle d'interprétation des résultats théoriques qui…
Advisors/Committee Members: Roy, Clermont (advisor).
Subjects/Keywords: Composites
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APA (6th Edition):
Dupont, L. (1988). Étude du comportement mécanique d'un composite stratifié graphite/epoxy soumis à des sollicitations monotones et cycliques. (Masters Thesis). Université de Sherbrooke. Retrieved from http://hdl.handle.net/11143/15896
Chicago Manual of Style (16th Edition):
Dupont, Luc. “Étude du comportement mécanique d'un composite stratifié graphite/epoxy soumis à des sollicitations monotones et cycliques.” 1988. Masters Thesis, Université de Sherbrooke. Accessed February 27, 2021.
http://hdl.handle.net/11143/15896.
MLA Handbook (7th Edition):
Dupont, Luc. “Étude du comportement mécanique d'un composite stratifié graphite/epoxy soumis à des sollicitations monotones et cycliques.” 1988. Web. 27 Feb 2021.
Vancouver:
Dupont L. Étude du comportement mécanique d'un composite stratifié graphite/epoxy soumis à des sollicitations monotones et cycliques. [Internet] [Masters thesis]. Université de Sherbrooke; 1988. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/11143/15896.
Council of Science Editors:
Dupont L. Étude du comportement mécanique d'un composite stratifié graphite/epoxy soumis à des sollicitations monotones et cycliques. [Masters Thesis]. Université de Sherbrooke; 1988. Available from: http://hdl.handle.net/11143/15896
Université de Sherbrooke
10.
Ben Hamouda, Yassine.
Étude expérimentale de l'endommagement d'un stratifié composite en carbone/époxyde sous chargement équibiaxial.
Degree: 1993, Université de Sherbrooke
URL: http://hdl.handle.net/11143/16890
► L'endommagement d'un stratifié composite en carbone/époxyde (0,90)s sous chargement équibiaxial est investigué. Différentes méthodes, extensométriques et non-destructives, sont utilisées pour évaluer le comportement mécanique des…
(more)
▼ L'endommagement d'un stratifié composite en carbone/époxyde (0,90)s sous chargement équibiaxial est investigué. Différentes méthodes, extensométriques et non-destructives, sont utilisées pour évaluer le comportement mécanique des éprouvettes cruciformes sous charge et le mode d'endommagement interne de l'échantillon. Une étude préliminaire utilisant la photoélasticité dans un premier temps, a permis de visualiser la distribution des contraintes dans la section sous charge de l'éprouvette cruciforme et en conséquence d'apporter des améliorations au procédé de fabrication et d'usinage de l'éprouvette. Par la suite, des essais sans sollicitation mécanique ont été réalisés afin d'établir l'influence du voltage d'excitation des jauges électriques sur leur réponse en déformation. Un extensomètre mécanique biaxial, conçu dans le Laboratoire de Structures de l'Université de Sherbrooke a servi à vérifier la précision des mesures prises par des jauges collées sur un matériau composite. Trois paires d'éprouvettes ont été testées pour étudier l'endommagement du stratifié. Une éprouvette de chaque paire était instrumentée avec des jauges électriques afin de suivre l'endommagement à partir de la surface de l'échantillon tandis que pour la deuxième, l'appareil à ultra-sons "C-Scan" servait à suivre l'évolution de l'endommagement interne de l'échantillon à différents paliers de chargement. Les résultats de l'endommagement obtenus par ces deux méthodes furent alors comparés aux sections micrographiques de l'endommagement visualisées à l'aide d'un microscope électronique à balayage. La concordance entre les différentes informations obtenues a permis de tirer des conclusions quant aux mécanismes d'initiation, de propagation et de la phase finale de l'endommagement du stratifié.
Advisors/Committee Members: Roy, Clermont (advisor).
Subjects/Keywords: Composites
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APA (6th Edition):
Ben Hamouda, Y. (1993). Étude expérimentale de l'endommagement d'un stratifié composite en carbone/époxyde sous chargement équibiaxial. (Masters Thesis). Université de Sherbrooke. Retrieved from http://hdl.handle.net/11143/16890
Chicago Manual of Style (16th Edition):
Ben Hamouda, Yassine. “Étude expérimentale de l'endommagement d'un stratifié composite en carbone/époxyde sous chargement équibiaxial.” 1993. Masters Thesis, Université de Sherbrooke. Accessed February 27, 2021.
http://hdl.handle.net/11143/16890.
MLA Handbook (7th Edition):
Ben Hamouda, Yassine. “Étude expérimentale de l'endommagement d'un stratifié composite en carbone/époxyde sous chargement équibiaxial.” 1993. Web. 27 Feb 2021.
Vancouver:
Ben Hamouda Y. Étude expérimentale de l'endommagement d'un stratifié composite en carbone/époxyde sous chargement équibiaxial. [Internet] [Masters thesis]. Université de Sherbrooke; 1993. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/11143/16890.
Council of Science Editors:
Ben Hamouda Y. Étude expérimentale de l'endommagement d'un stratifié composite en carbone/époxyde sous chargement équibiaxial. [Masters Thesis]. Université de Sherbrooke; 1993. Available from: http://hdl.handle.net/11143/16890
Université de Sherbrooke
11.
Labossière, Pierre.
Analyse par éléments finis de plaques de matériaux composites.
Degree: 1983, Université de Sherbrooke
URL: http://hdl.handle.net/11143/14523
► Nous étudions dans ce travail le comportement de matériaux composites contenant un défaut interne, lorsqu'ils sont soumis à des charges axiales. Les matériaux étudiés sont…
(more)
▼ Nous étudions dans ce travail le comportement de matériaux
composites contenant un défaut interne, lorsqu'ils sont soumis à des charges axiales. Les matériaux étudiés sont constitués d'un assemblage de lamelles transversalement isotropes, dont deux des axes principaux sont dans le plan de la plaque. Les lamelles internes sont traversées par un défaut de forme circulaire. L'analyse est exécutée en utilisant un programme d'éléments finis en trois dimensions basé sur un élément prismatique triangulaire à six noeuds, et dont la fiabilité a été démontrée. Les contraintes sont analysées spécialement aux alentours du défaut pour trois types de matériaux. La modification de la rigidité des éléments soumis à des efforts plus grands que ceux permis par un critère de contrainte maximum permet d'étudier la propagation des dommages dans la plaque. Cette étude est effectuée pour un seul matériau.
Advisors/Committee Members: Neale, Kenneth (advisor).
Subjects/Keywords: Composites
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APA ·
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MLA ·
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CSE |
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APA (6th Edition):
Labossière, P. (1983). Analyse par éléments finis de plaques de matériaux composites. (Masters Thesis). Université de Sherbrooke. Retrieved from http://hdl.handle.net/11143/14523
Chicago Manual of Style (16th Edition):
Labossière, Pierre. “Analyse par éléments finis de plaques de matériaux composites.” 1983. Masters Thesis, Université de Sherbrooke. Accessed February 27, 2021.
http://hdl.handle.net/11143/14523.
MLA Handbook (7th Edition):
Labossière, Pierre. “Analyse par éléments finis de plaques de matériaux composites.” 1983. Web. 27 Feb 2021.
Vancouver:
Labossière P. Analyse par éléments finis de plaques de matériaux composites. [Internet] [Masters thesis]. Université de Sherbrooke; 1983. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/11143/14523.
Council of Science Editors:
Labossière P. Analyse par éléments finis de plaques de matériaux composites. [Masters Thesis]. Université de Sherbrooke; 1983. Available from: http://hdl.handle.net/11143/14523
Université de Sherbrooke
12.
Neglo, Kouma.
Analyse par éléments finis de l'endommagement des plaques de matériaux composites ayant un trou central circulaire.
Degree: 1983, Université de Sherbrooke
URL: http://hdl.handle.net/11143/14534
► La loi de comportement des matériaux orthotropes (transversalement isotropes) est utilisée conjointement avec l'élément prismatique linéaire pour mettre au point un programme d'éléments finis en…
(more)
▼ La loi de comportement des matériaux orthotropes (transversalement isotropes) est utilisée conjointement avec l'élément prismatique linéaire pour mettre au point un programme d'éléments finis en trois dimensions servant à analyser l'endommagement des plaques de matériaux
composites. La fiabilité des résultats numériques obtenus à l’aide de ce programme est mise en évidence en faisant une étude comparative sur les prédictions des théories de l' élasticité des couches isotropes et orthotropes. La répartition des contraintes aux environs d’un trou central circulaire dans un laminé fibreux sous différentes sollicitations est analysée dans cette étude. De plus, la propagation des dommages dans un laminé fibreux sous chargement uniaxial uniforme, la comparaison de la résistance ultime du laminé ayant un trou central circulaire celle de la même plaque sans défaut, font l'objet de la présente recherche.
Advisors/Committee Members: Neale, Kenneth (advisor).
Subjects/Keywords: Composites
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Neglo, K. (1983). Analyse par éléments finis de l'endommagement des plaques de matériaux composites ayant un trou central circulaire. (Masters Thesis). Université de Sherbrooke. Retrieved from http://hdl.handle.net/11143/14534
Chicago Manual of Style (16th Edition):
Neglo, Kouma. “Analyse par éléments finis de l'endommagement des plaques de matériaux composites ayant un trou central circulaire.” 1983. Masters Thesis, Université de Sherbrooke. Accessed February 27, 2021.
http://hdl.handle.net/11143/14534.
MLA Handbook (7th Edition):
Neglo, Kouma. “Analyse par éléments finis de l'endommagement des plaques de matériaux composites ayant un trou central circulaire.” 1983. Web. 27 Feb 2021.
Vancouver:
Neglo K. Analyse par éléments finis de l'endommagement des plaques de matériaux composites ayant un trou central circulaire. [Internet] [Masters thesis]. Université de Sherbrooke; 1983. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/11143/14534.
Council of Science Editors:
Neglo K. Analyse par éléments finis de l'endommagement des plaques de matériaux composites ayant un trou central circulaire. [Masters Thesis]. Université de Sherbrooke; 1983. Available from: http://hdl.handle.net/11143/14534
Université de Sherbrooke
13.
Roberge, Judith.
Caractérisation de l'endommagement des matériaux composites carbone-époxyde sollicités en compression statique et cyclique.
Degree: 1988, Université de Sherbrooke
URL: http://hdl.handle.net/11143/15642
► Cette étude a pour but d'identifier la nature et le moment d'apparition des modes de rupture des matériaux composites carbone-époxyde sollicités en compression statique et…
(more)
▼ Cette étude a pour but d'identifier la nature et le moment d'apparition des modes de rupture des matériaux
composites carbone-époxyde sollicités en compression statique et cyclique. A cette fin, les méthodes expérimentales retenues sont de deux natures. D'une part, l'endommagement du matériau est suivi par émission acoustique (EA) et par extensométrie axiale. D'autre part, les techniques de pelage, de marquage de la matrice et de répliques des bords longitudinaux sont appliquées aux éprouvettes endommagées pour identifier les modes de rupture par microscopie optique et à balayage. Les essais en compression statique des éprouvettes unidirectionnelles et croisées de composition CELION 3000 et 6000/5208 montrent certaines particuliarités communes d'EA: nombre et amplitude des salves relativement faibles; activité acoustique présente tôt lors de l'essai; évolution quasi-linéaire des salves en fonction de la charge; discontinuité de la relation de POLLOCK et de la loi Gaussienne ce qui laisse supposer la présence de plus d'un mécanisme d'endommagement. L'observation microscopique des éprouvettes croisées révèle la présence de nombreuses microfissures dans la résine concentrées aux plis 45° (associées à la majorité des salves de faible amplitude) et la délamination entre les plis 0° et 90° (salves de forte amplitude). L'analyse du module d'élasticité en compression cyclique à 1 Hz et 10 Hz réalisée sur le matériau IM6 5245c montre que les éprouvettes 0° ne s'endommagent pas en fatigue car l'énergie dissipée, évaluée à partir des boucles d'hystérésis, demeure constante. Quant aux éprouvettes 90°, la baisse du module d'élasticité est causée par l'apparition et la progression de microfissures parallèles à l'axe de sollicitation. L'observation des répliques des bords longitudinaux confirme ce résultat.
Advisors/Committee Members: Proulx, Denis (advisor).
Subjects/Keywords: Composites
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APA ·
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APA (6th Edition):
Roberge, J. (1988). Caractérisation de l'endommagement des matériaux composites carbone-époxyde sollicités en compression statique et cyclique. (Masters Thesis). Université de Sherbrooke. Retrieved from http://hdl.handle.net/11143/15642
Chicago Manual of Style (16th Edition):
Roberge, Judith. “Caractérisation de l'endommagement des matériaux composites carbone-époxyde sollicités en compression statique et cyclique.” 1988. Masters Thesis, Université de Sherbrooke. Accessed February 27, 2021.
http://hdl.handle.net/11143/15642.
MLA Handbook (7th Edition):
Roberge, Judith. “Caractérisation de l'endommagement des matériaux composites carbone-époxyde sollicités en compression statique et cyclique.” 1988. Web. 27 Feb 2021.
Vancouver:
Roberge J. Caractérisation de l'endommagement des matériaux composites carbone-époxyde sollicités en compression statique et cyclique. [Internet] [Masters thesis]. Université de Sherbrooke; 1988. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/11143/15642.
Council of Science Editors:
Roberge J. Caractérisation de l'endommagement des matériaux composites carbone-époxyde sollicités en compression statique et cyclique. [Masters Thesis]. Université de Sherbrooke; 1988. Available from: http://hdl.handle.net/11143/15642
14.
Miriyala, Sethu M.
Effect of composite microstructure on electrical and mechanical properties of poly(vinyl acetate) composites with carbon black and clay.
Degree: MS, Mechanical Engineering, 2009, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1566
► The electrical and mechanical behavior of carbon black filled poly(vinyl acetate) latex-based and solution-based polymer composites was examined. A set of experiments were performed to…
(more)
▼ The electrical and mechanical behavior of carbon black filled poly(vinyl acetate) latex-based and solution-based polymer
composites was examined. A set of experiments were performed to distinguish
composites with a segregated network (emulsion-based) from those with random dispersion (solution-based) of the filler. The percolation thresholds for the emulsion-based
composites were near 1.2 vol% carbon black, while the solution-based
composites were around 8.2 vol% carbon black. This difference is due to the segregated network formation, which leads to excluded volume effects in emulsion-based systems. This excluded volume created by the solid polymer particles forces the carbon black particles into conductive pathways at low concentration. In the solution-based case, fully solvated polymer results in a random dispersion of carbon black. The segregated network composite also shows significant improvement in both electrical conductivity and storage modulus with low carbon black loading, while the solution-based composite achieves significant property enhancements at higher carbon black loading because of the greater percolation threshold. The effect of clay in both emulsion and solution-based
composites with carbon black was also studied by preparing
composites with three clay concentrations (0.2, 0.4 and 2 wt%). In emulsion-based
composites, low clay concentration reduced the percolation threshold from 1.2 vol% to 0.8 vol% carbon black, but with solution-based
composites clay increased the percolation threshold from 8.2 vol% to 11.7 vol% carbon black. It is assumed that clay helps to force the carbon black particles into the conductive pathways in the emulsion-based
composites. In solution-base
composites, clay improves the dispersion of carbon black, thereby destroying the carbon black network and reducing conductivity and storage modulus. The storage modulus in emulsion-based
composites improved with 0.2 wt% clay but greater clay concentration resulted in a drop in modulus due to porosity from excess excluded volume effects.
Advisors/Committee Members: GRUNLAN, JAIME C. (advisor), BALBUENA, PERLA (committee member), ZHANG, XINGHANG (committee member).
Subjects/Keywords: composites
…a typical clay (a) and common types of clay
composites formed (b)… …solution-based composites (b) containing 2.5 vol% carbon black… …11
7
Freeze-fractured cross-sections of PVAc/CB latex-based composites
containing 2.5… …16
8
Freeze-fractured cross-sections of PVAc/CB solution-based composites
containing 2.5… …PVAc solution and emulsion-based composites.......................... 23
x
FIGURE
Page…
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APA (6th Edition):
Miriyala, S. M. (2009). Effect of composite microstructure on electrical and mechanical properties of poly(vinyl acetate) composites with carbon black and clay. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1566
Chicago Manual of Style (16th Edition):
Miriyala, Sethu M. “Effect of composite microstructure on electrical and mechanical properties of poly(vinyl acetate) composites with carbon black and clay.” 2009. Masters Thesis, Texas A&M University. Accessed February 27, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-1566.
MLA Handbook (7th Edition):
Miriyala, Sethu M. “Effect of composite microstructure on electrical and mechanical properties of poly(vinyl acetate) composites with carbon black and clay.” 2009. Web. 27 Feb 2021.
Vancouver:
Miriyala SM. Effect of composite microstructure on electrical and mechanical properties of poly(vinyl acetate) composites with carbon black and clay. [Internet] [Masters thesis]. Texas A&M University; 2009. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1566.
Council of Science Editors:
Miriyala SM. Effect of composite microstructure on electrical and mechanical properties of poly(vinyl acetate) composites with carbon black and clay. [Masters Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1566
Université de Sherbrooke
15.
Gagnon, Yves.
Techniques expérimentales de visualisation de l'endommagement dans un composite carbone/époxyde sous sollicitations biaxiales.
Degree: 1995, Université de Sherbrooke
URL: http://hdl.handle.net/11143/17410
► L'étude porte sur le suivi de l'endommagement dans un stratifié [0/90]s carbone/époxyde soumis à des sollicitations en traction biaxiale en utilisant deux techniques de contrôle…
(more)
▼ L'étude porte sur le suivi de l'endommagement dans un stratifié [0/90]s carbone/époxyde soumis à des sollicitations en traction biaxiale en utilisant deux techniques de contrôle non destructif en conjonction avec la microscopie optique et électronique lors de la rupture finale des éprouvettes. Une technique éprouvée soit la radiographie-X avec opacifiant et une nouvelle, l'imagerie acoustique, ont servi comme moyens principaux d'observation de l'endommagement en conjonction avec la microscopie des échantillons prélevés sur des éprouvettes rompues. L'axe des recherches présentées dans ce mémoire a porté sur la mise au point de méthodes fiables de visualisation et de quantification de ces dommages ainsi que de leur seuil d'apparition. Pour tout chargement biaxial, les résultats montrent la charge pour laquelle le premier endommagement se produit ainsi que la localisation et la propagation de cet endommagement dans chaque pli du stratifié. La corrélation entre les calculs de la densité de fissures dans les échantillons prélevés d'une éprouvette plane biaxiale amenée à la rupture sous traction monotone démontre que les trois techniques fournissent une approche fiable pour caractériser l'amorçage et la progression des dommages dans les matériaux
composites fibreux.
Advisors/Committee Members: Roy, Clermont (advisor).
Subjects/Keywords: Composites
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Gagnon, Y. (1995). Techniques expérimentales de visualisation de l'endommagement dans un composite carbone/époxyde sous sollicitations biaxiales. (Masters Thesis). Université de Sherbrooke. Retrieved from http://hdl.handle.net/11143/17410
Chicago Manual of Style (16th Edition):
Gagnon, Yves. “Techniques expérimentales de visualisation de l'endommagement dans un composite carbone/époxyde sous sollicitations biaxiales.” 1995. Masters Thesis, Université de Sherbrooke. Accessed February 27, 2021.
http://hdl.handle.net/11143/17410.
MLA Handbook (7th Edition):
Gagnon, Yves. “Techniques expérimentales de visualisation de l'endommagement dans un composite carbone/époxyde sous sollicitations biaxiales.” 1995. Web. 27 Feb 2021.
Vancouver:
Gagnon Y. Techniques expérimentales de visualisation de l'endommagement dans un composite carbone/époxyde sous sollicitations biaxiales. [Internet] [Masters thesis]. Université de Sherbrooke; 1995. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/11143/17410.
Council of Science Editors:
Gagnon Y. Techniques expérimentales de visualisation de l'endommagement dans un composite carbone/époxyde sous sollicitations biaxiales. [Masters Thesis]. Université de Sherbrooke; 1995. Available from: http://hdl.handle.net/11143/17410
University of Manchester
16.
Cui, Zhengxing.
A study of doubly crosslinked microgels and their
composites.
Degree: 2017, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:308151
► This thesis presents a study of pH-responsive doubly crosslinked microgels (DX MGs) and associated investigations to enhance their performance. The potential application of this material…
(more)
▼ This thesis presents a study of pH-responsive
doubly crosslinked microgels (DX MGs) and associated investigations
to enhance their performance. The potential application of this
material is soft tissue engineering, so the research concerns
mechanical properties, other properties like swelling, microporous
and conductivity are also discussed. The MG particles are based on
poly(EA/MAA/x), where EA is the ethyl acrylate, MAA is the
methacrylate acid and x represents the crosslinker. The particles
were subsequently functionalised using glycidyl methacrylate (GMA)
to introduce vinyl groups in the MG particles. The formation of DX
MGs includes a pH triggered swelling of MG particles in the
dispersion to form a physical gel and a heat-triggered free-radical
reaction to form a covalent hydrogel. The starting point of this
study was using graphene oxide (GO) nanosheets to prepare DX MGs
composites with a high modulus. We mixed low concentrations of GO
with MG particles and formed DX MG/GO gels. Both shear and
compressive modulus linearly increased with the concentration of
GO, but the ductility of gels was slightly reduced. The moduli for
the DX MG/GO gels was increased by a factor of 5 - 6 when only 1.0
wt.% of GO was included.The next study used muti-wall carbon
nanotubes (CNTs) which are widely used to prepare electrical
conductive
composites. A big challenge for applying CNTs is that
they easily form large aggregates in water, which was solved by the
space-filling and volume excluded properties of MG particles. The
ductility of the composite DX gels increased with CNT
concentration, as did the modulus. The conductivity of gels
significantly increased with the concentration of CNT and they had
a very low percolation threshold. The cytotoxic study for the
composite gels showed that they were not toxic, so they may be
suitable for soft tissue engineering.The effect of crosslinking
monomers in MG preparation was studied in the last part of the
research. Three types of poly(EA/MAA/x) MGs were studied and
compared. The x value was 1 mol. % of divinylbenzene (DVB);
1,4-butanediol diacrylate (BDDA) or a 1:1 mixture of both DVB and
BDDA. The MGs containing DVB demonstrated higher swelling and more
ductile properties and could withstand ~76% of compressive
deformation. Moreover, the effects of intra-MG crosslinking of the
MGs on the swelling behaviour and the mechanical properties were
investigated.
Advisors/Committee Members: KINLOCH, IAN IA, Saunders, Brian, Kinloch, Ian.
Subjects/Keywords: microgels; composites
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APA (6th Edition):
Cui, Z. (2017). A study of doubly crosslinked microgels and their
composites. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:308151
Chicago Manual of Style (16th Edition):
Cui, Zhengxing. “A study of doubly crosslinked microgels and their
composites.” 2017. Doctoral Dissertation, University of Manchester. Accessed February 27, 2021.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:308151.
MLA Handbook (7th Edition):
Cui, Zhengxing. “A study of doubly crosslinked microgels and their
composites.” 2017. Web. 27 Feb 2021.
Vancouver:
Cui Z. A study of doubly crosslinked microgels and their
composites. [Internet] [Doctoral dissertation]. University of Manchester; 2017. [cited 2021 Feb 27].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:308151.
Council of Science Editors:
Cui Z. A study of doubly crosslinked microgels and their
composites. [Doctoral Dissertation]. University of Manchester; 2017. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:308151
University of Oklahoma
17.
Grace, Landon.
Non-Fickian Three-Dimensional Moisture Absorption in Polymeric Composites: Development and Validation of Hindered Diffusion Model.
Degree: PhD, 2012, University of Oklahoma
URL: http://hdl.handle.net/11244/319198
► The three-dimensional anisotropic moisture absorption behavior of a quartz-fiber-reinforced bismaleimide (BMI) laminate is investigated by collecting 21 months of experimental gravimetric data. Laminates of six,…
(more)
▼ The three-dimensional anisotropic moisture absorption behavior of a quartz-fiber-reinforced bismaleimide (BMI) laminate is investigated by collecting 21 months of experimental gravimetric data. Laminates of six, twelve, and forty plies and various planar aspect ratios are used to determine the three-dimensional anisotropic diffusion behavior when exposed to full immersion in distilled water at 25<C. The long-term moisture absorption behavior deviates from the widely-used Fickian model, but excellent agreement is achieved between experimental gravimetric data and the 3D HDM. Diffusion through the laminate edges occurs 15 times faster on average than diffusion through the thickness, further highlighting the importance of anisotropic diffusion consideration.
Advisors/Committee Members: Altan, M. Cengiz (advisor).
Subjects/Keywords: Polymeric composites
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APA (6th Edition):
Grace, L. (2012). Non-Fickian Three-Dimensional Moisture Absorption in Polymeric Composites: Development and Validation of Hindered Diffusion Model. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/319198
Chicago Manual of Style (16th Edition):
Grace, Landon. “Non-Fickian Three-Dimensional Moisture Absorption in Polymeric Composites: Development and Validation of Hindered Diffusion Model.” 2012. Doctoral Dissertation, University of Oklahoma. Accessed February 27, 2021.
http://hdl.handle.net/11244/319198.
MLA Handbook (7th Edition):
Grace, Landon. “Non-Fickian Three-Dimensional Moisture Absorption in Polymeric Composites: Development and Validation of Hindered Diffusion Model.” 2012. Web. 27 Feb 2021.
Vancouver:
Grace L. Non-Fickian Three-Dimensional Moisture Absorption in Polymeric Composites: Development and Validation of Hindered Diffusion Model. [Internet] [Doctoral dissertation]. University of Oklahoma; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/11244/319198.
Council of Science Editors:
Grace L. Non-Fickian Three-Dimensional Moisture Absorption in Polymeric Composites: Development and Validation of Hindered Diffusion Model. [Doctoral Dissertation]. University of Oklahoma; 2012. Available from: http://hdl.handle.net/11244/319198
18.
Bouzat, Fabien.
Elaboration des composites SiC/ZrC par synthèse organométallique et par différentes voies de pyrolyse : Development of SiC/ZrC composites by organometallic synthesis and by different pyrolysis routes.
Degree: Docteur es, Matériaux Céramiques et Traitements de Surface, 2015, Limoges
URL: http://www.theses.fr/2015LIMO0130
► Dans le domaine des matériaux de structure destinés à des applications thermomécaniques sous conditions extrêmes, les carbures métalliques et, plus particulièrement, ceux de la famille…
(more)
▼ Dans le domaine des matériaux de structure destinés à des applications thermomécaniques sous conditions extrêmes, les carbures métalliques et, plus particulièrement, ceux de la famille de métaux de transition (i.e. titane, zirconium, hafnium) sont de bons candidats étant donné la nature à la fois métallique et covalente de leurs liaisons. De plus, parmi les céramiques non-oxydes, le carbure de silicium est le plus employé dans la réalisation de composites particulaires du fait de son bon comportement à l’oxydation à haute température. Les composites de type SiC/ZrC seraient de bons candidats pour des applications à haute température dans des atmosphères oxydantes car ils sont susceptibles de développer des propriétés thermostructurales intéressantes. Cependant, l’élaboration de composites particulaires, avec un bon contrôle de la distribution respective des deux phases carbures au sein de la microstructure, n’est pas parfaitement maîtrisée. En particulier, l’amélioration ou l’optimisation des performances thermomécaniques de ces céramiques avancées, exige le contrôle de leur composition chimique à l’échelle atomique et de leur nanostructuration. L’approche « Precursor Derived Ceramics » (PDCs) permet notamment de moduler la composition du matériau à l’échelle moléculaire et d’obtenir des matériaux de formes diverses et complexes (nanomatériaux, fibres, dépôts, composites). Cette méthode, appliquée au système Si/C/Zr, est basée sur la synthèse de polymères précéramiques par chimie click et hydrosilylation. Des poudres ultrafines obtenues après le traitement thermique par spray pyrolyse laser des précurseurs pourront suivre des étapes ultimes de mise en forme, de consolidation et de densification.
In the field of structural materials for thermomechanical applications under extreme conditions, metal carbides, and more specifically, those of the transition metal family (i.e. titanium, zirconium, hafnium) are good candidates thanks to the nature of the both metallic and covalent bonds. Further, among the non-oxide ceramics, silicon carbide is the most used in the elaboration of particulate composites because of its good oxidation behavior at high temperature. SiC/ZrC composites would be good candidates for high temperature applications in oxidizing atmospheres thanks to their ability to develop interesting thermostructural properties. However, the development of particulate composites, with good control of the respective distribution of the two carbides phases in the microstructure is not well controlled. Particularly, improving or optimizing the thermomechanical performances of these advanced ceramics, requires to control the chemical composition at the atomic scale and their nanostructuration. The "Precursor Derived Ceramics" approach (PDCs) notably allows to modulate the composition of the material at the molecular level and to obtain materials of various and complex shapes (nanomaterials, fibers, deposits, composites). This method, applied to the Si/C/Zr system is based on the synthesis ofpreceramic polymers by…
Advisors/Committee Members: Foucaud, Sylvie (thesis director), Lucas, Romain (thesis director).
Subjects/Keywords: Composites SiC/ZrC; SiC/ZrC Composites; 620.14
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APA (6th Edition):
Bouzat, F. (2015). Elaboration des composites SiC/ZrC par synthèse organométallique et par différentes voies de pyrolyse : Development of SiC/ZrC composites by organometallic synthesis and by different pyrolysis routes. (Doctoral Dissertation). Limoges. Retrieved from http://www.theses.fr/2015LIMO0130
Chicago Manual of Style (16th Edition):
Bouzat, Fabien. “Elaboration des composites SiC/ZrC par synthèse organométallique et par différentes voies de pyrolyse : Development of SiC/ZrC composites by organometallic synthesis and by different pyrolysis routes.” 2015. Doctoral Dissertation, Limoges. Accessed February 27, 2021.
http://www.theses.fr/2015LIMO0130.
MLA Handbook (7th Edition):
Bouzat, Fabien. “Elaboration des composites SiC/ZrC par synthèse organométallique et par différentes voies de pyrolyse : Development of SiC/ZrC composites by organometallic synthesis and by different pyrolysis routes.” 2015. Web. 27 Feb 2021.
Vancouver:
Bouzat F. Elaboration des composites SiC/ZrC par synthèse organométallique et par différentes voies de pyrolyse : Development of SiC/ZrC composites by organometallic synthesis and by different pyrolysis routes. [Internet] [Doctoral dissertation]. Limoges; 2015. [cited 2021 Feb 27].
Available from: http://www.theses.fr/2015LIMO0130.
Council of Science Editors:
Bouzat F. Elaboration des composites SiC/ZrC par synthèse organométallique et par différentes voies de pyrolyse : Development of SiC/ZrC composites by organometallic synthesis and by different pyrolysis routes. [Doctoral Dissertation]. Limoges; 2015. Available from: http://www.theses.fr/2015LIMO0130
University of Johannesburg
19.
Madzivhandila, Takalani.
Feasibility of manufacturing ceramic based metal matrix composites (MMC) for multi-purpose industrial application.
Degree: 2012, University of Johannesburg
URL: http://hdl.handle.net/10210/8034
► M.Tech.
The mining industry exerts ever increasing demand for components with high wear resistance to the extent that plain ferrous alloys are falling short. Innovative…
(more)
▼ M.Tech.
The mining industry exerts ever increasing demand for components with high wear resistance to the extent that plain ferrous alloys are falling short. Innovative metal-matrix composites nonferrous metals have been widely researched and used. Casting composites based on ferrous alloys pose monumental challenges in casting. Firstly, the density differential results in large resistant forces on the ceramic such that unless a rigid structure is configured, the less dense ceramic floats on the metal stream. Secondly, the poor wetting properties between metal and ceramic will result in inferior bonding of the matrix, hence separation of solids in service.This study presents the feasibility of manufacturing ceramic based metal matrix composites (MMC) for multi-purpose industrial application including wettability and the bonding between the matrix and the composite. The cold rods of alumina positioned in the mould prior to casting cracked as soon as they came in contact with hot metal. Because of the density difference between ceramic and liquid metal the alumina tended to float under the influence of Ferro static pressure. Infiltration of zirconia (ZrO2) and alumina (Al2O3) in ferrous matrix was investigated. Infiltration of liquid metal in ceramic filters increased with porosity of filters i.e. greater infiltration occurred in filters with larger pore volume fraction measured in terms of number of pores per linear inch (ppi). Thus, there was high infiltration in casting with 10ppi followed by 30ppi and there was poor infiltration in 50ppi ceramics. Infiltration increased with increasing temperature of the ceramics. A temperature of 1000 °C was found to be superior to 800 °C. The wetting behaviour of molten iron on the substrates of Al2O3 was investigated. Titanium in high chromium white cast iron was found to improve the wetting characteristics on alumina. The wetting angle decreased with increased titanium content. The wear properties of ferrous alloys used were not significantly improved by the ceramic used to make the composite. Filters are produced by a deposition process and hence are not densified for the purpose of manufacturing hard composites
Subjects/Keywords: Ceramic-matrix composites; Metallic composites; Ceramic fibers
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APA (6th Edition):
Madzivhandila, T. (2012). Feasibility of manufacturing ceramic based metal matrix composites (MMC) for multi-purpose industrial application. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/8034
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):
Madzivhandila, Takalani. “Feasibility of manufacturing ceramic based metal matrix composites (MMC) for multi-purpose industrial application.” 2012. Thesis, University of Johannesburg. Accessed February 27, 2021.
http://hdl.handle.net/10210/8034.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Madzivhandila, Takalani. “Feasibility of manufacturing ceramic based metal matrix composites (MMC) for multi-purpose industrial application.” 2012. Web. 27 Feb 2021.
Vancouver:
Madzivhandila T. Feasibility of manufacturing ceramic based metal matrix composites (MMC) for multi-purpose industrial application. [Internet] [Thesis]. University of Johannesburg; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10210/8034.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Madzivhandila T. Feasibility of manufacturing ceramic based metal matrix composites (MMC) for multi-purpose industrial application. [Thesis]. University of Johannesburg; 2012. Available from: http://hdl.handle.net/10210/8034
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
20.
Siot, Alexandra.
Elaboration et caractérisation de polymères nanochargés : ELABORATION AND CHARACTERIZATION OF NANOCHARGED POLYMERS.
Degree: Docteur es, Chimie des matériaux, 2018, IMT Mines Alès
URL: http://www.theses.fr/2018EMAL0001
Élaboration et caractérisation de polymères nanocharges
Elaboration and characterization of nanocharged polymers
Advisors/Committee Members: Caro, Anne-Sophie (thesis director), Azema, Nathalie (thesis director).Subjects/Keywords: MODELISATION; COMPOSITES; POLYMERES; POLYMERS; COMPOSITES; MODELLING
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APA (6th Edition):
Siot, A. (2018). Elaboration et caractérisation de polymères nanochargés : ELABORATION AND CHARACTERIZATION OF NANOCHARGED POLYMERS. (Doctoral Dissertation). IMT Mines Alès. Retrieved from http://www.theses.fr/2018EMAL0001
Chicago Manual of Style (16th Edition):
Siot, Alexandra. “Elaboration et caractérisation de polymères nanochargés : ELABORATION AND CHARACTERIZATION OF NANOCHARGED POLYMERS.” 2018. Doctoral Dissertation, IMT Mines Alès. Accessed February 27, 2021.
http://www.theses.fr/2018EMAL0001.
MLA Handbook (7th Edition):
Siot, Alexandra. “Elaboration et caractérisation de polymères nanochargés : ELABORATION AND CHARACTERIZATION OF NANOCHARGED POLYMERS.” 2018. Web. 27 Feb 2021.
Vancouver:
Siot A. Elaboration et caractérisation de polymères nanochargés : ELABORATION AND CHARACTERIZATION OF NANOCHARGED POLYMERS. [Internet] [Doctoral dissertation]. IMT Mines Alès; 2018. [cited 2021 Feb 27].
Available from: http://www.theses.fr/2018EMAL0001.
Council of Science Editors:
Siot A. Elaboration et caractérisation de polymères nanochargés : ELABORATION AND CHARACTERIZATION OF NANOCHARGED POLYMERS. [Doctoral Dissertation]. IMT Mines Alès; 2018. Available from: http://www.theses.fr/2018EMAL0001
Baylor University
21.
Zhang, Cong, 1986-.
Modeling of flexible fiber motion and prediction of material properties.
Degree: M.S.M.E., Engineering., 2011, Baylor University
URL: http://hdl.handle.net/2104/8251
► This work employs the rod chain model of Wang et al. (2006) to study the motion of discrete flexible fibers. Results are presented for both…
(more)
▼ This work employs the rod chain model of Wang et al. (2006) to study the motion of discrete flexible fibers. Results are presented for both individual fibers and a stochastic distribution of fibers to study the variations in the transient effects between the rigid and the flexible fiber systems. Results demonstrate that the observed period decreases as the fiber flexure increases, and provide insight into the modifications required for the orientation distribution function of flexible suspensions. To demonstrate the importance in studying the alterations in the transient effects on a processed part, a study of the cured composite stiffness is presented for the flexible fiber system using the micro-mechanical approach of Hsiao and Daniel (1996) along with an adapted version of the rigid fiber micromechanical approach discussed by Jack and Smith (2008).
Advisors/Committee Members: Jack, David Abram, 1977- (advisor).
Subjects/Keywords: Fiber reinforced composites.; Polymeric composites.; Modeling.; Simulation.
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APA (6th Edition):
Zhang, Cong, 1. (2011). Modeling of flexible fiber motion and prediction of material properties. (Masters Thesis). Baylor University. Retrieved from http://hdl.handle.net/2104/8251
Chicago Manual of Style (16th Edition):
Zhang, Cong, 1986-. “Modeling of flexible fiber motion and prediction of material properties.” 2011. Masters Thesis, Baylor University. Accessed February 27, 2021.
http://hdl.handle.net/2104/8251.
MLA Handbook (7th Edition):
Zhang, Cong, 1986-. “Modeling of flexible fiber motion and prediction of material properties.” 2011. Web. 27 Feb 2021.
Vancouver:
Zhang, Cong 1. Modeling of flexible fiber motion and prediction of material properties. [Internet] [Masters thesis]. Baylor University; 2011. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2104/8251.
Council of Science Editors:
Zhang, Cong 1. Modeling of flexible fiber motion and prediction of material properties. [Masters Thesis]. Baylor University; 2011. Available from: http://hdl.handle.net/2104/8251
University of Manitoba
22.
Gupta, Abhishek.
Creep of plain weave polymer matrix composites.
Degree: Mechanical and Manufacturing Engineering, 2010, University of Manitoba
URL: http://hdl.handle.net/1993/3849
► Woven (also known as textile) composites are one class of polymer matrix composites with increasing market share in aerospace, autmobile, civil infrastructure applications mostly due…
(more)
▼ Woven (also known as textile)
composites are one class of polymer matrix
composites with increasing market share in aerospace, autmobile, civil infrastructure applications mostly due to their lightweight, their flexibility to form into desired shape, their mechanical properties and toughness. Due to the viscoelasticity of the polymer matrix, time-dependent degradation in modulus (creep) and strength (creep rupture) are two of the major mechanical properties required by engineers to design a structure reliably when using these materials. Unfortunately, creep and creep rupture of woven
composites have received little attention by the research community and thus, there is a dire need to generate additional knowledge and prediction models, given the increasing market share of woven
composites in load bearing structural applications. In this thesis, an analytical creep model, namely the Modified Equivalent Laminate Model (MELM), was developed to predict tensile creep of plain weave
composites for any orientation of the load with respect to the orientation of the fill and warp fibers, using creep of unidirectional
composites. The model was validated using an extensive experimental involving the tensile creep of plain weave
composites under varying loading orientation and service conditions. Plain weave epoxy (F263)/ carbon fiber (T300) composite, currently used in aerospace applications, was procured as fabrics from Hexcel Corporation. Creep tests were conducted under two loading conditions: on-axis loading (00) and off-axis loading (450). Constant load creep, in the temperature range of 80–2400C and stress range of 1-70% UTS of the
composites, was experimentally evaluated for time periods ranging from 1–120 hours under both loading conditions. The composite showed increase in creep with increase in temperature and stress. Creep of composite increased with increase in angle of loading, from 1% under on-axis loading to 31% under off-axis loading, within the tested time window. The experimental creep data for plain weave
composites were superposed using TTSP (Time Temperature Superposition Principle) to obtain a master curve of experimental data extending to several years and was compared with model predictions to validate the model. The experimental and model results were found in good agreement within an error range of +1-3% under both loading conditions. A parametric study was also conducted to understand the effect of microstructure of plain weave
composites on its on-axis and off-axis creep. Additionally, this thesis generated knowledge on time-dependent damage in woven
composites and its effect on creep and tensile properties and their prediction.
Advisors/Committee Members: Jayaraman, Raghavan (Mechanical & Manufacturing Engineering) (supervisor), Hoa, Suong(Mechanical & Industrial Engineering, Concordia University) Polyzois, Dimos (Civil Engineering) Bassim, Nabil (Mechanical & Manufacuturing Engineering) (examiningcommittee).
Subjects/Keywords: Plain Weave Composites; Creep; Woven Composites
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APA (6th Edition):
Gupta, A. (2010). Creep of plain weave polymer matrix composites. (Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/3849
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):
Gupta, Abhishek. “Creep of plain weave polymer matrix composites.” 2010. Thesis, University of Manitoba. Accessed February 27, 2021.
http://hdl.handle.net/1993/3849.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Gupta, Abhishek. “Creep of plain weave polymer matrix composites.” 2010. Web. 27 Feb 2021.
Vancouver:
Gupta A. Creep of plain weave polymer matrix composites. [Internet] [Thesis]. University of Manitoba; 2010. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1993/3849.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Gupta A. Creep of plain weave polymer matrix composites. [Thesis]. University of Manitoba; 2010. Available from: http://hdl.handle.net/1993/3849
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Hong Kong University of Science and Technology
23.
Zhao, Zhiyuan.
Transport properties of pseudo ductile cementitious composites.
Degree: 2012, Hong Kong University of Science and Technology
URL: http://repository.ust.hk/ir/Record/1783.1-7525
;
https://doi.org/10.14711/thesis-b1176703
;
http://repository.ust.hk/ir/bitstream/1783.1-7525/1/th_redirect.html
► The transport properties of concrete are important parameters governing the durability of reinforced concrete structures. As the opening of cracks can significantly degrade the transport…
(more)
▼ The transport properties of concrete are important parameters governing the durability of reinforced concrete structures. As the opening of cracks can significantly degrade the transport properties, the crack control ability of materials is also important for maintaining high durability under practical situations. This study focuses on the water permeability and chloride diffusivity of pseudo-ductile cementitious composites (PDCC), which exhibits strain-hardening behavior in tension accompanied by the formation of closely spaced cracks with very small opening. , Concrete structures with a surface layer of PDCC can potentially exhibit excellent durability. However, former work related to the design of PDCC has focused on the achievement of pseudo-ductility, so good transport properties at the un-cracked state are not guaranteed. In this investigation, water permeability and chloride diffusivity tests are carried out together with direct tensile test on a number of PDCC compositions. The effect of various mix design parameters (including pozzolan/cement ratio, pozzolan type, sand/binder ratio, percentage of rubber particles and dosage of pore blocking admixture) on both the pseudo-ductility and the transport properties can hence be studied. From the results, we have identified PDCC compositions with (i) tensile ductility over 0.9% and excellent control of crack opening, and (ii) transport properties similar to high performance concrete. The findings pave the way for optimizing PDCC mix design for both mechanical performance and long-term durability. As part of our study, the transport properties of cracked PDCC specimens are also measured. The PDCC has good crack width control capability and a large number of fine cracks instead of a single main crack are formed under tensile loading. With transport properties measured from both cracked and un-cracked specimens, the effect of cracking can be quantified. The results show that the crack width is the key factor that affects the transport properties, as a tiny increase of the crack width can lead to a large increase of transport through the crack. For the same deformation, the crack opening in PDCC is much less than that in normal concrete, so the change in transport properties is also much smaller. According to the results of the present investigation, PDCC has a high potential for practical application as a surface layer or permanent formwork for the construction of durable concrete structures.
Subjects/Keywords: Cement composites – Transport properties
; Cement composites – Testing
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APA (6th Edition):
Zhao, Z. (2012). Transport properties of pseudo ductile cementitious composites. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-7525 ; https://doi.org/10.14711/thesis-b1176703 ; http://repository.ust.hk/ir/bitstream/1783.1-7525/1/th_redirect.html
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):
Zhao, Zhiyuan. “Transport properties of pseudo ductile cementitious composites.” 2012. Thesis, Hong Kong University of Science and Technology. Accessed February 27, 2021.
http://repository.ust.hk/ir/Record/1783.1-7525 ; https://doi.org/10.14711/thesis-b1176703 ; http://repository.ust.hk/ir/bitstream/1783.1-7525/1/th_redirect.html.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zhao, Zhiyuan. “Transport properties of pseudo ductile cementitious composites.” 2012. Web. 27 Feb 2021.
Vancouver:
Zhao Z. Transport properties of pseudo ductile cementitious composites. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2012. [cited 2021 Feb 27].
Available from: http://repository.ust.hk/ir/Record/1783.1-7525 ; https://doi.org/10.14711/thesis-b1176703 ; http://repository.ust.hk/ir/bitstream/1783.1-7525/1/th_redirect.html.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zhao Z. Transport properties of pseudo ductile cementitious composites. [Thesis]. Hong Kong University of Science and Technology; 2012. Available from: http://repository.ust.hk/ir/Record/1783.1-7525 ; https://doi.org/10.14711/thesis-b1176703 ; http://repository.ust.hk/ir/bitstream/1783.1-7525/1/th_redirect.html
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Hong Kong University of Science and Technology
24.
Zhang, Lei MAE.
Study on organics-accelerated benzoxazine polymerization and the structure-property relationship.
Degree: 2017, Hong Kong University of Science and Technology
URL: http://repository.ust.hk/ir/Record/1783.1-97182
;
https://doi.org/10.14711/thesis-b1781046
;
http://repository.ust.hk/ir/bitstream/1783.1-97182/1/th_redirect.html
► Polybenzoxazine constitutes a new generation of thermosets, which inherits the advantages from phenolic resins while overcomes the drawbacks. The other unique properties, such as low…
(more)
▼ Polybenzoxazine constitutes a new generation of thermosets, which inherits the advantages from phenolic resins while overcomes the drawbacks. The other unique properties, such as low curing shrinkage, low water absorption and good molecular design flexibility, make it a potential candidate in adhesives, microelectronic packaging as well as aerospace engineering. However, conventional benzoxazines are mostly solid under room temperature and require high curing temperature, which complicate their processing and limit their commercialization. Brønsted acids and Lewis acids are efficient accelerators for benzoxazine polymerization. But they are prohibited in electronics, metal adhension and outdoor applications due to the halogen and metal elements, corrosive acidic attributes and moisture sensitivity. Organics like phenol and thiol are effective accelerators without the aforementioned disadvantages. However, when they are used as the accelerators, the properties of the materials are worse than that of their thermally cured counterparts. Amine is a newly discovered accelerator for benzoxazine. By carefully designing the molecular structure of amine, it is possible to accelerate benzoxazine polymerization as well as enhance material properties. Unfortunately, the mechanism of benzoxazine/amine reaction is still not very clear to date. Thus, it is of significant importance to investigate the reaction mechanism and establish the structure-property relationship in order to provide the guideline for accelerator design. Therefore, the aim of the thesis is to 1) develop new benzoxazine and benzoxazine/epoxy system with good processability and material properties; 2) establish the structure-property relationship; 3) investigate the reaction mechanism of benzoxazine and amine 4) introduce a new methodology for developing accelerators to benefit both polymerization and material properties. The first part of the thesis reports the development of a new benzoxazine through convenient preparation method with inexpensive raw materials to overcome the challenges of high liquefying and curing temperature. The product is liquid under room temperature with a low viscosity suitable for resin transfer molding. The incorporated amine accelerates the polymerization at low temperature, which is much faster than that of conventional benzoxazine. By copolymerization with epoxy, the obtained copolymers show better material performances, which include higher glass transition temperature, higher char yield, high flexural modulus and strength. The second part focuses on establishing the structure-property relationship of benzoxazine and amine. Phenylenediamine isomers are selected in this part of study and the directing effect of amino group on aryl ring is highlighted. Other than the conventional amine-attacking path when any kind of amine is used, aryl-attacking path is found only when meta-isomer is applied. The new path siginificantly changes the reactivity of meta-isomer with benzoxazine and dramatically influences the material properties. Due…
Subjects/Keywords: Thermosetting composites
; Polymeric composites
; Thermal properties
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APA (6th Edition):
Zhang, L. M. (2017). Study on organics-accelerated benzoxazine polymerization and the structure-property relationship. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-97182 ; https://doi.org/10.14711/thesis-b1781046 ; http://repository.ust.hk/ir/bitstream/1783.1-97182/1/th_redirect.html
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):
Zhang, Lei MAE. “Study on organics-accelerated benzoxazine polymerization and the structure-property relationship.” 2017. Thesis, Hong Kong University of Science and Technology. Accessed February 27, 2021.
http://repository.ust.hk/ir/Record/1783.1-97182 ; https://doi.org/10.14711/thesis-b1781046 ; http://repository.ust.hk/ir/bitstream/1783.1-97182/1/th_redirect.html.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zhang, Lei MAE. “Study on organics-accelerated benzoxazine polymerization and the structure-property relationship.” 2017. Web. 27 Feb 2021.
Vancouver:
Zhang LM. Study on organics-accelerated benzoxazine polymerization and the structure-property relationship. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2017. [cited 2021 Feb 27].
Available from: http://repository.ust.hk/ir/Record/1783.1-97182 ; https://doi.org/10.14711/thesis-b1781046 ; http://repository.ust.hk/ir/bitstream/1783.1-97182/1/th_redirect.html.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zhang LM. Study on organics-accelerated benzoxazine polymerization and the structure-property relationship. [Thesis]. Hong Kong University of Science and Technology; 2017. Available from: http://repository.ust.hk/ir/Record/1783.1-97182 ; https://doi.org/10.14711/thesis-b1781046 ; http://repository.ust.hk/ir/bitstream/1783.1-97182/1/th_redirect.html
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Hong Kong University of Science and Technology
25.
Shi, Tiansheng CIVL.
Multiple cracking analysis of fiber reinforced cementitious composite with softening or hardening behavior.
Degree: 2017, Hong Kong University of Science and Technology
URL: http://repository.ust.hk/ir/Record/1783.1-105586
;
https://doi.org/10.14711/thesis-991012549662803412
;
http://repository.ust.hk/ir/bitstream/1783.1-105586/1/th_redirect.html
► Concrete is the most widely used construction material. Cracking is an important issue for concrete because cracks not only affect the mechanical behavior of concrete…
(more)
▼ Concrete is the most widely used construction material. Cracking is an important issue for concrete because cracks not only affect the mechanical behavior of concrete but also its serviceability. Moreover, large crack opening may lead to durability problems of reinforced concrete structures. To improve the toughness of concrete and to control the cracks, different types of fibers are employed to produce fiber reinforced concrete (FRC) or, more generally, fiber reinforced cementitious composite (FRCC). In FRCC material, the main function of fiber is to bridge the cracks and to improve the post-cracking ductility of the material. Ideally, multiple cracking can be resulted so the opening of each crack under a certain deformation becomes smaller. When multiple cracks occur at small spacing, they tend to interact with each other, and form complex crack patterns. With fiber incorporated to enhance the toughness of the composite material, cracks occur even closer to each other and interact more intensively, which is difficult to analyze. Moreover, the formation of multiple cracks in FRCC involves sophisticated stress transfer between fiber and matrix, which imposes additional challenge on the analysis. In this thesis, the following key questions are addressed. What are the governing mechanisms in multiple cracking process of fiber reinforced cementitious materials? How can these mechanisms be considered in numerical models? How can the structural performance of FRCC under different loading conditions be assessed? For FRCC with strain-softening law, the mechanism of multiple crack interaction is being focused on. Based on the minimum energy principle, a method of energy minimization is developed and used to predict the multiple cracking pattern of quasi-brittle beam. The fracture behavior of the quasi-brittle material is simulated by cohesive zone model using the bilinear tension softening law. After appropriate normalization based on dimensional analysis, the multiple cracking process is found to be governed by only three parameters and their effects are systematically studied. Physically, the ratio between the “crack-tip toughness” and the “bridging toughness” is important for the crack pattern evolution. As a validation, the proposed method is used to predict the experimental crack pattern of fiber reinforced concrete beam and good agreement is achieved. The results of the study can provide material selection guidelines for crack control. In addition, by determining the crack pattern with a sound physical basis (which is the commonly adopted minimum energy criterion), the results can serve as a benchmark for checking the reliability of other methods for multiple cracking analysis For strain-hardening materials, the mechanism of stress transfer between fiber and matrix is emphasized when analyzing their multiple cracking behavior. A new discrete model, with the matrix represented by continuum elements exhibiting smeared cracking behavior and the bridging effect of fiber represented by truss elements with proper…
Subjects/Keywords: Fibrous composites
; Cracking
; Cement composites
; Analysis
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APA (6th Edition):
Shi, T. C. (2017). Multiple cracking analysis of fiber reinforced cementitious composite with softening or hardening behavior. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-105586 ; https://doi.org/10.14711/thesis-991012549662803412 ; http://repository.ust.hk/ir/bitstream/1783.1-105586/1/th_redirect.html
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):
Shi, Tiansheng CIVL. “Multiple cracking analysis of fiber reinforced cementitious composite with softening or hardening behavior.” 2017. Thesis, Hong Kong University of Science and Technology. Accessed February 27, 2021.
http://repository.ust.hk/ir/Record/1783.1-105586 ; https://doi.org/10.14711/thesis-991012549662803412 ; http://repository.ust.hk/ir/bitstream/1783.1-105586/1/th_redirect.html.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Shi, Tiansheng CIVL. “Multiple cracking analysis of fiber reinforced cementitious composite with softening or hardening behavior.” 2017. Web. 27 Feb 2021.
Vancouver:
Shi TC. Multiple cracking analysis of fiber reinforced cementitious composite with softening or hardening behavior. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2017. [cited 2021 Feb 27].
Available from: http://repository.ust.hk/ir/Record/1783.1-105586 ; https://doi.org/10.14711/thesis-991012549662803412 ; http://repository.ust.hk/ir/bitstream/1783.1-105586/1/th_redirect.html.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Shi TC. Multiple cracking analysis of fiber reinforced cementitious composite with softening or hardening behavior. [Thesis]. Hong Kong University of Science and Technology; 2017. Available from: http://repository.ust.hk/ir/Record/1783.1-105586 ; https://doi.org/10.14711/thesis-991012549662803412 ; http://repository.ust.hk/ir/bitstream/1783.1-105586/1/th_redirect.html
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Université Montpellier II
26.
Papavero, Amory.
Élaboration et caractérisation de composites hybrides thermoélectriques : Synthesis and characterisation of thermoelectric composites.
Degree: Docteur es, Chimie et physicochimie des matériaux, 2012, Université Montpellier II
URL: http://www.theses.fr/2012MON20240
Élaboration et caractérisation de composites hybrides thermoélectriques
Synthesis and characterisation of thermoelectric composites
Advisors/Committee Members: Tédenac, Jean-Claude (thesis director), Cornu, David-Jacques (thesis director).Subjects/Keywords: Composites; Thermoélectricité; Synthèse; Composites; Thermoelectricity; Synthesis
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APA (6th Edition):
Papavero, A. (2012). Élaboration et caractérisation de composites hybrides thermoélectriques : Synthesis and characterisation of thermoelectric composites. (Doctoral Dissertation). Université Montpellier II. Retrieved from http://www.theses.fr/2012MON20240
Chicago Manual of Style (16th Edition):
Papavero, Amory. “Élaboration et caractérisation de composites hybrides thermoélectriques : Synthesis and characterisation of thermoelectric composites.” 2012. Doctoral Dissertation, Université Montpellier II. Accessed February 27, 2021.
http://www.theses.fr/2012MON20240.
MLA Handbook (7th Edition):
Papavero, Amory. “Élaboration et caractérisation de composites hybrides thermoélectriques : Synthesis and characterisation of thermoelectric composites.” 2012. Web. 27 Feb 2021.
Vancouver:
Papavero A. Élaboration et caractérisation de composites hybrides thermoélectriques : Synthesis and characterisation of thermoelectric composites. [Internet] [Doctoral dissertation]. Université Montpellier II; 2012. [cited 2021 Feb 27].
Available from: http://www.theses.fr/2012MON20240.
Council of Science Editors:
Papavero A. Élaboration et caractérisation de composites hybrides thermoélectriques : Synthesis and characterisation of thermoelectric composites. [Doctoral Dissertation]. Université Montpellier II; 2012. Available from: http://www.theses.fr/2012MON20240
Oregon State University
27.
Bai, Wen.
New application of crystalline cellulose in rubber composites.
Degree: PhD, Wood Science, 2009, Oregon State University
URL: http://hdl.handle.net/1957/13475
► Rubber without reinforcement has limited applications. The strength of reinforced rubber composites can be ten times stronger than that of unreinforced rubbers. Therefore, rubber composites…
(more)
▼ Rubber without reinforcement has limited applications. The strength of reinforced rubber
composites can be ten times stronger than that of unreinforced rubbers. Therefore, rubber
composites are widely used in various applications ranging from automobile tires to seals, valves, and gaskets because of their excellent mechanical elastic properties. Silica and carbon black are the two most commonly used reinforcing materials in rubber tires. They are derived from non-renewable materials and are expensive. Silica also contributes to a large amount of ash when used tires are disposed of by incineration. There is a need for a new reinforcing filler that is inexpensive, renewable and easily disposable. Cellulose is the most abundant natural polymer. Native cellulose includes crystalline regions and amorphous regions. Crystalline cellulose can be obtained by removing the amorphous regions with the acid hydrolysis of cellulose because the amorphous cellulose can be hydrolyzed faster than crystalline cellulose. We recently discovered that the partial replacement of silica with microcrystalline cellulose (MCC) provided numerous benefits: 1) low energy consumption for compounding, 2) good processability, 3) strong tensile properties, 4) good heat resistance, and 5) potential for good fuel efficiency in the application of rubber tires.
Strong bonding between fillers and a rubber matrix is essential for imparting rubber
composites with the desired properties for many specific applications. The bonding between hydrophilic MCC and the hydrophobic rubber matrix is weak and can be improved by addition of a coupling agent or surface modifications of MCC. In this study, MCC was surface-modified with acryloyl chloride or alkenyl ketene dimer (AnKD) to form acrylated MCC (A-MCC) and AnKD-modified MCC (AnKD-MCC). The surface modifications of MCC did not change the integrity and mechanical properties of MCC, but provided functional groups that were able to form covalent linkages with the rubber matrix during the vulcanization. Both A-MCC and AnKD-MCC facilitated the process and production of rubber
composites and improved tensile properties and heat resistance of the resulting rubber
composites as MCC did when they were used for the partial replacement of silica in rubber
composites. Furthermore, A-MCC and AnKD-MCC were superior to MCC in terms of improving tear properties of rubber
composites.
It has been well-established that the size and the geometrical features of reinforcing fillers play important roles in the mechanical properties of the reinforced
composites. MCC was further hydrolyzed with acid to form nanocrystalline cellulose (NCC), i.e., cellulose crystals with their width of less than 100 nm. A novel differential centrifugation technique has been developed for separation of NCC mixtures into fractions with a narrow size distribution. The NCC was investigated as a filler in rubber
composites through a dry blending process, but saw little success. NCC had to be dried before it could be blended with…
Advisors/Committee Members: Li, Kaichang (advisor), Hansen, Everett (committee member).
Subjects/Keywords: Rubber composites; Cellulose
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APA ·
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Manager
APA (6th Edition):
Bai, W. (2009). New application of crystalline cellulose in rubber composites. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/13475
Chicago Manual of Style (16th Edition):
Bai, Wen. “New application of crystalline cellulose in rubber composites.” 2009. Doctoral Dissertation, Oregon State University. Accessed February 27, 2021.
http://hdl.handle.net/1957/13475.
MLA Handbook (7th Edition):
Bai, Wen. “New application of crystalline cellulose in rubber composites.” 2009. Web. 27 Feb 2021.
Vancouver:
Bai W. New application of crystalline cellulose in rubber composites. [Internet] [Doctoral dissertation]. Oregon State University; 2009. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1957/13475.
Council of Science Editors:
Bai W. New application of crystalline cellulose in rubber composites. [Doctoral Dissertation]. Oregon State University; 2009. Available from: http://hdl.handle.net/1957/13475
28.
Parvatikar, Narsimha.
Some studies on polyaniline and its composites.
Degree: Physics, 2005, Gulbarga University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/17685
► Tremendous advances have been made during the past decade in our understanding of the Physics, chemistry, electrochemistry, structure, electrical and optical phenomena, processing and applications…
(more)
▼ Tremendous advances have been made during the past
decade in our understanding of the Physics, chemistry,
electrochemistry, structure, electrical and optical phenomena,
processing and applications of conducting polymers. This constantly
growing solid scientific foundation continues to disclose new
emerging chemistry and physical properties of these materials which
present a vast area of as yet unexplained or incompletely
understood phenomena. The very great interest in these polymers is
due largely to their relative ease of synthesis by chemical or
electrochemical oxidative polymerization of the monomers and to
their very considerable potential technological
importance.
References included in chapters, Summary p.
170-174, List of publications p. 175-176
Advisors/Committee Members: Ambika Prasad M V N.
Subjects/Keywords: Physics; Polyaniline; Composites
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APA (6th Edition):
Parvatikar, N. (2005). Some studies on polyaniline and its composites. (Thesis). Gulbarga University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/17685
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):
Parvatikar, Narsimha. “Some studies on polyaniline and its composites.” 2005. Thesis, Gulbarga University. Accessed February 27, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/17685.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Parvatikar, Narsimha. “Some studies on polyaniline and its composites.” 2005. Web. 27 Feb 2021.
Vancouver:
Parvatikar N. Some studies on polyaniline and its composites. [Internet] [Thesis]. Gulbarga University; 2005. [cited 2021 Feb 27].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/17685.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Parvatikar N. Some studies on polyaniline and its composites. [Thesis]. Gulbarga University; 2005. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/17685
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
29.
Choi, Woongchul.
Synthesis and Fabrication of Carbon Nanotube Based Composite Materials for Fuel Cell Catalyst and Ultra-Resilient Aerogel.
Degree: PhD, Materials Science and Engineering, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/187209
► Carbon nanotubes have been actively investigated in a wide range of applications since carbon nanotubes have excellent electrical, thermal, and mechanical properties. In particular, a…
(more)
▼ Carbon nanotubes have been actively investigated in a wide range of applications since carbon nanotubes have excellent electrical, thermal, and mechanical properties. In particular, a great deal of research is being carried out to improve and control their properties by different functionalization methods. Among them, I have developed two functionalization methods for the controlling of properties, which are doping carbon nanotubes with heteroatoms and fabricating polymer composite based on carbon nanotubes.
I studied a facile one-step synthesis method of nitrogen-iron coordinated carbon nanotube catalysts without precious metals. Our catalyst shows excellent onset ORR potential comparable to those of other precious metal free catalysts, and the maximum limiting current density from our catalysts is larger than that of the Pt-based catalysts.
In addition to the development of carbon nanotubes-based aerogel composite, I studied the facile and quick process for the scalable production of super resilient CNT-PDMS composite by microwave heating with ultra-low thermal conductivity and high electrical properties. This report describes that the microwave heating process can lead to a quick reaction and allow for the uniform polymer layer on CNT, which enhance the mechanical properties of carbon nanotube composite. Furthermore, CNT-PDMS composite aerogel shows high mechanical strength (0.18 MPa), compressibility, thermal insulation (26 mW m-
1 K
-1) and elasticity-dependent electric conduction.
Advisors/Committee Members: Yu, Choongho (advisor), Radovic, Miladin (committee member), Naraghi, Mohammad (committee member), Mukherjee, Partha (committee member).
Subjects/Keywords: Carbon nanotube; composites
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APA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Choi, W. (2017). Synthesis and Fabrication of Carbon Nanotube Based Composite Materials for Fuel Cell Catalyst and Ultra-Resilient Aerogel. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/187209
Chicago Manual of Style (16th Edition):
Choi, Woongchul. “Synthesis and Fabrication of Carbon Nanotube Based Composite Materials for Fuel Cell Catalyst and Ultra-Resilient Aerogel.” 2017. Doctoral Dissertation, Texas A&M University. Accessed February 27, 2021.
http://hdl.handle.net/1969.1/187209.
MLA Handbook (7th Edition):
Choi, Woongchul. “Synthesis and Fabrication of Carbon Nanotube Based Composite Materials for Fuel Cell Catalyst and Ultra-Resilient Aerogel.” 2017. Web. 27 Feb 2021.
Vancouver:
Choi W. Synthesis and Fabrication of Carbon Nanotube Based Composite Materials for Fuel Cell Catalyst and Ultra-Resilient Aerogel. [Internet] [Doctoral dissertation]. Texas A&M University; 2017. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1969.1/187209.
Council of Science Editors:
Choi W. Synthesis and Fabrication of Carbon Nanotube Based Composite Materials for Fuel Cell Catalyst and Ultra-Resilient Aerogel. [Doctoral Dissertation]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/187209
Penn State University
30.
Matthews, Peter Joseph.
Modeling Continuous-fiber Reinforced Polymer Composites for Exploration of Damage Tolerant Concepts.
Degree: 2015, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/25002
► This work aims to improve the predictive capability for fiber-reinforced polymer matrix composite laminates using the finite element method. A new tool for modeling composite…
(more)
▼ This work aims to improve the predictive capability for fiber-reinforced polymer matrix composite laminates using the finite element method. A new tool for modeling composite damage was developed which considers important modes of failure. Well-known micromechanical models were implemented to predict material values for material systems of interest to aerospace applications. These generated material values served as input to intralaminar and interlaminar damage models. A three-dimensional in-plane damage material model was implemented and behavior verified. Deficiencies in current state-of-the-art interlaminar capabilities were explored using the virtual crack closure technique and the cohesive zone model. A user-defined cohesive element was implemented to discover the importance of traction-separation material constitutive behavior. A novel method for correlation of traction-separation parameters was created. This new damage modeling tool was used for evaluation of novel material systems to improve damage tolerance. Classical laminate plate theory was used in a full-factorial study of layerwise-hybrid laminates. Filament-wound laminated composite cylindrical shells were subjected to quasi-static loading to validate the finite element computational composite damage model. The new tool for modeling provides sufficient accuracy and generality for use on a wide-range of problems.
Advisors/Committee Members: Kevin L Koudela, Dissertation Advisor/Co-Advisor, Charles E Bakis, Committee Chair/Co-Chair, Sulin Zhang, Committee Member, Panagiotis Michaleris, Committee Member.
Subjects/Keywords: composites; delamination; damage
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APA (6th Edition):
Matthews, P. J. (2015). Modeling Continuous-fiber Reinforced Polymer Composites for Exploration of Damage Tolerant Concepts. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/25002
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):
Matthews, Peter Joseph. “Modeling Continuous-fiber Reinforced Polymer Composites for Exploration of Damage Tolerant Concepts.” 2015. Thesis, Penn State University. Accessed February 27, 2021.
https://submit-etda.libraries.psu.edu/catalog/25002.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Matthews, Peter Joseph. “Modeling Continuous-fiber Reinforced Polymer Composites for Exploration of Damage Tolerant Concepts.” 2015. Web. 27 Feb 2021.
Vancouver:
Matthews PJ. Modeling Continuous-fiber Reinforced Polymer Composites for Exploration of Damage Tolerant Concepts. [Internet] [Thesis]. Penn State University; 2015. [cited 2021 Feb 27].
Available from: https://submit-etda.libraries.psu.edu/catalog/25002.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Matthews PJ. Modeling Continuous-fiber Reinforced Polymer Composites for Exploration of Damage Tolerant Concepts. [Thesis]. Penn State University; 2015. Available from: https://submit-etda.libraries.psu.edu/catalog/25002
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
◁ [1] [2] [3] [4] [5] … [138] ▶
. 
Open Access Theses and Dissertations
