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Dissertations / Theses on the topic 'Micromechanics'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Evans, Christabel. "Micromechanisms and micromechanics of Zircaloy-4." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/14335.

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The micromechanisms of Zircaloy-4 are investigated in relation to texture evolution, hydride formation and fatigue. The Zircaloy-4 plate used throughout this thesis was provided by Rolls- Royce plc, Derby, and was annealed post unidirectional rolling. The effect of strain rate on the texture evolution of Zircaloy-4 was investigated to understand how different processing methods would effect the final texture. Texture evolution during high temperature (550◦C) compression and tension tests were investigated using synchrotron X- ray diffraction in the transverse and rolling directions (TD and RD)

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2

Yap, Siaw Fung. "Micromechanics and powder compaction." Thesis, University of Birmingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.489036.

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3

Olsson, Erik. "Micromechanics of Powder Compaction." Doctoral thesis, KTH, Hållfasthetslära (Avd.), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-159142.

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Compaction of powders followed by sintering is a convenient manufacturing method for products of complex shape and components of materials that are difficult to produce using conventional metallurgy. During the compaction and the handling of the unsintered compact, defects can develop which could remain in the final sintered product. Modeling is an option to predict these issues and in this thesis micromechanical modeling of the compaction and the final components is discussed. Such models provide a more physical description than a macroscopic model, and specifically, the Discrete Element Meth

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4

Borodulina, Svetlana. "Micromechanics of Fiber Networks." Doctoral thesis, KTH, Hållfasthetslära (Inst.), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-188481.

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The current trends in papermaking involve, but are not limited to, maintaining the dry strength of paper material at a reduced cost. Since any small changes in the process affect several factors at once, it is difficult to relate the exact impact of these changes promptly. Hence, the detailed models of the network level of a dry sheet have to be studied extensively in order to attain the infinitesimal changes in the final product. In Paper A, we have investigated a relation between micromechanical processes and the stress–strain curve of a dry fiber network during tensile loading. The impact o

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5

Lei, Sheng-Yuan. "Deformation micromechanics in composite structures." Thesis, University of Manchester, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488306.

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6

Langroudi, Arya Assadi. "Micromechanics of collapse in loess." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/5284/.

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Soil collapse is amongst one of the most significant ground related hazards. A collapsible soil, in particular loess, typically has an open-structure and collapse occurs when as a consequence of the addition of water and/or load the particles rearrange to form a more dense fabric. Collapse leads to a suite of problems for buildings and infrastructures built on or in collapsing soil. Treatment to mitigate collapse often involves in densification. However, such approaches have been reported not always effective enough to combat the problem. This stems from a lack of understanding of soils’ geoch

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7

Ciomocos, M. T. "Micromechanics of agglomerate damage processes." Thesis, Aston University, 1996. http://publications.aston.ac.uk/14149/.

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This thesis reports a detailed investigation of the micromechanics of agglomerate behaviour under free-fall impact, double (punch) impact and diametrical compression tests using the simulation software TRUBAL. The software is based on the discrete element method (DEM) which incorporates the Newtonian equations of motion and contact mechanics theory to model the interparticle interactions. Four agglomerates have been used: three dense (differing in interface energy and contact density) and one loose. Although the simulated agglomerates are relatively coarse-grained, the results obtained are in

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8

Gong, Lei. "Deformation micromechanics of graphene nanocomposites." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/deformation-micromechanics-of-graphene-nanocomposites(b4e4780d-738f-4629-9dbb-151b1230bd52).html.

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Graphene nanocomposites have been successfully prepared in this study in the form of a sandwich structure of PMMA/graphene/SU-8. It has been proved that Raman spectroscopy is a powerful technique in the characterisation of the structure and deformation of graphene. The 2D band of the monolayer graphene has been used in the investigation of stress transfer in the graphene reinforced nanocomposites. It has been demonstrated that the 2D band moves towards low frequency linearly under tensile stress, which is shown to be significant method of monitoring the strain in graphene in a deformed specime

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9

Pantina, John Peter. "Interactions and micromechanics of colloidal aggregates /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 2.77 Mb., 193 p, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3221138.

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10

Russell, Benjamin Peter. "The micromechanics of composite lattice materials." Thesis, University of Cambridge, 2010. https://www.repository.cam.ac.uk/handle/1810/252176.

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11

Li, Hong. "Experimental micromechanics of composite buckling strength." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/11719.

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12

Eichhorn, Stephen J. "Deformation micromechanics of regenerated cellulosic fibres." Thesis, University of Manchester, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488200.

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13

Mohammadi-Aghdam, Mohammad. "Micromechanics of unidirectional metal matrix composites." Thesis, University of Bristol, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297843.

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14

Sharma, Rajdeep. "Micromechanics of toughening in polymeric composites." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38561.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2006.<br>Includes bibliographical references (leaves 195-206).<br>The macroscopic tensile toughness of glassy homo-polymers is often limited due to either localized crazing followed by failure [e.g., polymethyl-methacrylate (PMMA), polystyrene (PS)], or cavitation-induced brittle failure under high triaxiality [e.g., polycarbonate (PC)]. Judicious choice of polymer composites alleviates the above concerns by spreading the inelastic deformation and damage throughout the material, thereby increasing the macr

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15

Capolungo, Laurent. "Modeling of the size effect in the plastic behavior of polycrystalline materials." Diss., Available online, Georgia Institute of Technology, 2007, 2007. http://etd.gatech.edu/theses/available/etd-06112007-102904/.

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Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2008.<br>Garmestani, Hamid, Committee Member ; Johnson, Steven, Committee Chair ; McDowell, David, Committee Member ; Qu, Jianmin, Committee Co-Chair ; Cherkaoui, Mohammed, Committee Co-Chair.

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16

Sertse, Hamsasew M. "Micromechanics Based Failure Analysis of Heterogeneous Materials." Thesis, Purdue University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10689831.

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<p> In recent decades, heterogeneous materials are extensively used in various industries such as aerospace, defense, automotive and others due to their desirable specific properties and excellent capability of accumulating damage. Despite their wide use, there are numerous challenges associated with the application of these materials. One of the main challenges is lack of accurate tools to predict the initiation, progression and final failure of these materials under various thermomechanical loading conditions. Although failure is usually treated at the macro and meso-scale level, the initiat

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17

Al-Geroushi, Rajab A. "Probabilistic micromechanics of clay compression and consolidation." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75856.

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In the light of new studies of physico-chemical analysis, fabric, and particle interaction, the consideration of the actual constitution of the soil media is required for actual prediction of the soil media performance under loads. This study has been restricted to the prediction of clay performance under compression loading.<br>A micromechanics approach has been used in this research; a microelement scale has been introduced and a set of formulations (i.e., stress transfer, fluid flow equation, and volumetric constitutive equation) has been developed for this scale. The passage from the micro

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18

Uguz, Agah. "Micromechanics of crack extension in aluminium alloys." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.276988.

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19

Cheung, Lok Yee Geraldine. "Micromechanics of sand production in oil wells." Thesis, Imperial College London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.528300.

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20

O'Donovan, John. "Micromechanics of wave propagation through granular material." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/23921.

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The stiffness of soil is an important parameter that has implications on soil-structure interaction, on the response to earthquake motion and on the response of soils to dynamic loadings. Stiffness reduces and behaves plastically at medium to high strains; however, at small-strain the stiffness has been observed to be a constant value and elastic. Small-strain stiffness governs the soil-structure interaction during construction projects and site response during dynamic loading due to earthquakes and man-made operations. Quantifying stiffness, in particular shear stiffness, at small-strain is d

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21

Tang, Tian. "Variational Asymptotic Micromechanics Modeling of Composite Materials." DigitalCommons@USU, 2008. https://digitalcommons.usu.edu/etd/72.

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The issue of accurately determining the effective properties of composite materials has received the attention of numerous researchers in the last few decades and continues to be in the forefront of material research. Micromechanics models have been proven to be very useful tools for design and analysis of composite materials. In the present work, a versatile micromechanics modeling framework, namely, the Variational Asymptotic Method for Unit Cell Homogenization (VAMUCH), has been invented and various micromechancis models have been constructed in light of this novel framework. Considering th

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22

Olsson, Erik. "Micromechanics of Powder Compaction and Particle Contact." Licentiate thesis, KTH, Hållfasthetslära (Avd.), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-117608.

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23

Rashidian, Bizhan. "Micromachined devices based on PVDF-TrFE." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/13299.

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24

Frazier, Albert Bruno. "The use of polyimide for the development of micromachined materials, processes and devices." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/15696.

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25

Milne, Neil Graeme. "Finite element analysis of electrostatic axial-drive and wobble micromotors." Thesis, Heriot-Watt University, 1994. http://hdl.handle.net/10399/1363.

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26

Osman, Mohammad Shahril. "Measurement of granular contact forces using frequency scanning interferometry." Thesis, Loughborough University, 2002. https://dspace.lboro.ac.uk/2134/7025.

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The propagation of stress within a granular material has been studied for many years, but only recently have models and theories focused on the micromechanical (single grain) level. Experiments at this level are still rather limited in number. For this reason, a system using optical techniques has been developed. The substrate on which the granular bed is assembled is a double layer elastic substrate with high modulus epoxy constituting the top layer and silicone rubber as the bottom layer. In between the two layers, gold is coated which acts as a reflective film. To design the substrate, a Fi

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27

Stapleton, A. M. "Micromechanics and fatigue initiation in Ti-6Al-4V." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501489.

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28

Gu, Xiaohong. "Micromechanics of model carbon-fibre/epoxy-resin composites." Thesis, University of Manchester, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488261.

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29

Hejda, Marek. "Deformation micromechanics of single glass fibre reinforced composites." Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.491333.

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The current work presents for the first time the application of luminescence spectroscopy in following the micromechanical deformation of glass fibre reinforced composites; this has been achieved using luminescence-active glass fibres prepared from glass doped with small amounts of Sm3+. Glass prepared in this way exhibited several relatively sharp and intense luminescence peaks observed in the range 550 nm to 700 nm. The luminescence band located at 648 nm was used for the calibration of the local strain state of the fibre due to its distinctive linear shift towards lower wavelengths with inc

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30

Carman, Greg P. "Micromechanics of finite length fibers in composite materials." Diss., Virginia Tech, 1991. http://hdl.handle.net/10919/39869.

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31

Carapella, Elissa E. "Micromechanics of crenulated fibers in carbon/carbon composites." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09192009-040251/.

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32

Case, Scott Wayne. "Micromechanics of strength-related phenomena in composite materials." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-09122009-040447/.

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33

Guck, Jochen Reinhold. "Optical deformability micromechanics from cell research to biomedicine /." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3037014.

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34

Smith, Carmen Alexis. "Micromechanics of the through-thickness deformation of paperboard." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9426.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1999.<br>Includes bibliographical references (p. 171-172).<br>An experimental investigation of the behavior of paperboard has been performed, focusing on the identification of the mechanisms of through-thickness deformation. Experiments have been conducted at the microscopic and macroscopic levels, the difference between the two being the length scale. Experiments at the microscopic level were performed in a scanning electron microscope, allowing concurrent viewing of the deformation as it took place with ac

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35

Le, Menn Flora-Maud. "Micromechanics of cavitation in confined soft polymer layers." Electronic Thesis or Diss., Université Paris sciences et lettres, 2022. http://www.theses.fr/2022UPSLS044.

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Chaque seconde, 29 To de données sont échangées sur Internet et plus de 90% d'entre elles transitent par fibre optique. Les fibres de verre sont protégées par plusieurs couches de résines polymères de propriétés mécaniques différentes, la vitesse de production des câbles conduit à une accumulation de contraintes internes, pouvant mener à un phénomène de cavitation dans la première couche de protection de la fibre de verre. Afin d'étudier ce phénomère, nous avons synthétisé des réseaux élastomères à base d'oligomères fonctionnalisés di-(méth)acrylates (PPG8000) et de monomères acrylates (EHA et

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36

Brzesowsky, Rolf. "Micromechanics of sand grain failure and sand compaction = Micromechanica van het breukgedrag van zandkorrels en van het compactie gedrag van zand /." [S.l. : s.n.], 1995. http://www.gbv.de/dms/goettingen/19094918X.pdf.

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37

Fu, Yuhong. "Rapid solution of large-scale three-dimensional micromechanics problems /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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38

Xie, Mayue. "Interface problems in micromechanics and effective composite property analysis." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2005. http://wwwlib.umi.com/cr/syr/main.

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39

Sachtleber, Michael. "Surface roughening and micromechanics of plastically strained aluminum sheets /." Aachen : Shaker, 2005. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=014833476&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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40

Acharya, Sunil. "Micromechanics of asperity interaction in wear a numerical approach /." Connect to OhioLINK ETD Center, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1135267571.

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Dissertation (Ph. D.)--University of Akron, Dept. of Polymer Engineering, 2005.<br>"December, 2005." Title from electronic dissertation title page (viewed 09/17/2006) Advisor, Arkady I. Leonov; Co-Advisor, Joseph P. Padovan; Committee members, Joseph P. Padovan, Gary R. Hamed, Erol Sancaktar, Rudolph J. Scavuzzo, Jr.; Department Chair, Sadhan C. Jana; Dean of the College, Frank N. Kelley; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.

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41

Raghunathan, Seema L. "Texture and micromechanics of Forged Ti-10V-2Fe-3AI." Thesis, Imperial College London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485552.

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Ti-lOV-2Fe-3AI is a near-p titanium alloyÃ‚Â· primarily used in the landing gear of aircraft. Such components are normally produced by isothermal forging but the sensitivity of the microstructure to temperature makes forging optimisation difficult and therefore, an empirical approach is usually applied. To reduce the resultant high processing costs, it is essential for the industry to accurately l:ffiderstand and predict microstructural evolution and properties with respect to the isothennal forging variables. This thesis considers the evolution of macrotexture and microtexture in Ti-l0V..2Fe-

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42

Goutianos, Stergios. "Micromechanics of compressive failure in carbon-fibre polymer composites." Thesis, Queen Mary, University of London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.411718.

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43

Yang, Jiecheng. "DEM-CFD analysis of micromechanics for dry powder inhalers." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/6019/.

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Dry powder inhalers (DPIs) are widely used for the therapy of respiratory and pulmonary diseases. In this study, a coupled discrete element method and computational fluid dynamics (DEM-CFD) is employed to investigate the micromechanics of carrier-based DPIs. The effects of van der Waals forces and electrostatic forces on the mixing process, and the influences of air flow and particle-wall impact on the dispersion process are examined. For the mixing of carrier and active pharmaceutical ingredient (API) particles in a vibrating container, it is found that vibration conditions affect the mixing

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44

Chen, Ting-Ting S. M. Massachusetts Institute of Technology. "Microstructure and micromechanics of the sea urchin, Colobocentrotus atratus." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67360.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>"June 2011." Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (p. 128-132).<br>The purpose of this research is to study the porous microstructure and the micromechanics of the exoskeletal armor of the helmet urchin, Colobocentrotus atratus. Its unusual reduction in spines forms a smooth tiling of millimeter

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45

Venkovic, Nicolas. "Nanoindentation relaxation study and micromechanics of Cement-Based Materials." Master's thesis, Université Laval, 2016. http://hdl.handle.net/20.500.11794/27066.

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Ce travail évalue le comportement mécanique des matériaux cimentaires à différentes échelles de distance. Premièrement, les propriétés mécaniques du béton produit avec un bioplastifiant à base de microorganismes efficaces (EM) sont etudiées par nanoindentation statistique, et comparées aux propriétés mécaniques du béton produit avec un superplastifiant ordinaire (SP). Il est trouvé que l’ajout de bioplastifiant à base de produit EM améliore la résistance des C–S–H en augmentant la cohésion et la friction des nanograins solides. L’analyse statistique des résultats d’indentation suggère que le b

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46

Bandorawalla, Tozer Jamshed. "Micromechanics-Based Strength and Lifetime Prediction of Polymer Composites." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/26445.

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With the increasing use of composite materials for diverse applications ranging from civil infrastructure to offshore oil exploration, the durability of these materials is an important issue. Practical and accurate models for lifetime will enable engineers to push the boundaries of design and make the most efficient use of composite materials, while at the same time maintaining the utmost standards of safety. The work described in this dissertation is an effort to predict the strength and rupture lifetime of a unidirectional carbon fiber/polymer matrix composite using micromechanical techniq

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47

Pullawan, Tanittha. "Interfacial micromechanics of all-cellulose nanocomposites using Raman spectroscopy." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/interfacial-micromechanics-of-allcellulose-nanocomposites-using-raman-spectroscopy(e1d41897-368a-4b80-8683-7ee554b5731f).html.

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All-cellulose nanocomposites, in which both the matrix and the reinforcing fillers are cellulose, were successfully prepared using different solvents (LiCl/DMAc and NaOH/urea) and different sources of cellulose whiskers (cotton and tunicate whiskers) as control parameters. The volume fraction of cellulose whiskers was varied from 5 to 20%. The mechanical properties and crystallinity of the nanocomposites were characterised using tensile testing and X-ray diffraction. The tensile properties and crystallinity of nanocomposite samples are associated with the stiffness and crystallinity of the cel

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48

Zhang, Pan. "A virtual grain structure representation system for micromechanics simulations." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/9656.

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Representing a grain structure within a combined finite element computer aided engineering environment is essential for micromechanics simulations. Methods are required to effectively generate high-fidelity virtual grain structures for accurate studies. A high-fidelity virtual grain structure means a statistically equivalent structure in conjunction with desired grain size distribution features, and must be represented with realistic grain morphology. A family of controlled Poisson Voronoi tessellation (CPVT) models have been developed in this work for systematically generating virtual grain s

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49

Shabrov, Maxim N. "Micromechanical modeling of void nucleation in two phase materials /." View online version; access limited to Brown University users, 2005. http://wwwlib.umi.com/dissertations/fullcit/3174672.

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50

Kim, Young Woon. "Micromachined movable platforms as integrated optic devices." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/15874.

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