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Dissertations / Theses on the topic 'Multiscale deformations'

Author: Grafiati

Published: 25 January 2025

Last updated: 31 July 2025

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1

Song, Jin E. "Hierarchical multiscale modeling of Ni-base superalloys." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34855.

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Ni-base superalloys are widely used in hot sections of gas turbine engines due to the high resistance to fatigue and creep at elevated temperatures. Due to the demands for improved performance and efficiency in applications of the superalloys, new and improved higher temperature alloy systems are being developed. Constitutive relations for these materials need to be formulated accordingly to predict behavior of cracks at notches in components under cyclic loading with peak dwell periods representative of gas turbine engine disk materials. Since properties are affected by microstructure at var

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2

Shepherd, James Ellison. "Multiscale Modeling of the Deformation of Semi-Crystalline Polymers." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10479.

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The mechanical and physical properties of polymers are determined primarily by the underlying nano-scale structures and characteristics such as entanglements, crystallites, and molecular orientation. These structures evolve in complex manners during the processing of polymers into useful articles. Limitations of available and foreseeable computational capabilities prevent the direct determination of macroscopic properties directly from atomistic computations. As a result, computational tools and methods to bridge the length and time scale gaps between atomistic and continuum models are requ

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3

Shehadeh, Mu'Tasem A. "Modeling of high strain rate and strain localization in FCC single crystals multiscale dislocation dynamics analyses /." Online access for everyone, 2005. http://www.dissertations.wsu.edu/Dissertations/Spring2005/M%5FShehadeh%5F050405.pdf.

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4

Abou, Orm Lara. "VMS (Variational MultiScale) stabilization for Stokes-Darcy coupled flows in porous media undergoing finite deformations : application to infusion-based composite processing." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2013. http://tel.archives-ouvertes.fr/tel-00966922.

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Resin infusion-based processes are good candidates for manufacturing thin composite materials parts such as those used in aeronautics for instance. These processes consist in infusing a liquid resin into a stacking of fibrous preforms under the action of a mechanical pressure field applied onto this stacking where a stiff- distribution medium is also placed to create a resin feeding. Both physical and mechanical properties of the final pieces are rather difficult to predict and control. Numerical simulation are perfectly suited to master these processes. In the present work a numerical finite

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5

Brown, Stephen. "Analyse structurale et âge des déformations cassantes à micro- et méso-échelle dans un bassin sédimentaire intracontinental : le cas du Bassin de Paris." Electronic Thesis or Diss., CY Cergy Paris Université, 2024. http://www.theses.fr/2024CYUN1325.

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Le domaine intracontinental est éloigné des limites des plaques tectoniques sur lesquelles sont localisées l’essentiel des déformations. La déformation intraplaque est une conséquence de la transmission de la contrainte depuis les limites de plaques vers le domaine intraplaque. Elle peut s’exprimer par un flambage lithosphérique, par des déformations régionales et des réseaux de fractures à micro- et méso-échelle. Ces déformations reflètent la nature des régimes de contraintes aux limites des plaques continentales. Elles ont une distribution hétérogène et à l'échelle régionale, révèlent souven

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6

Brödling, Nils. "Multiscale modeling of fracture and deformation in interface controlled materials." [S.l. : s.n.], 2007. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-36166.

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7

Shashkov, Ivan. "Multiscale study of the intermittency of plastic deformation by acoustic emission method." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0326/document.

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Les études récentes de la déformation plastique à l'aide de techniques expérimentales à haute résolution témoignent que les processus de déformation sont souvent caractérisés par des effets collectifs qui émergent à une échelle mésoscopique, intermédiaire entre celle de défauts cristallins et celle d'une éprouvette macroscopique. Notamment, la méthode de l'émission acoustique (EA) révèle, dans divers conditions expérimentales, l'intermittence de la déformation plastique, qui se manifeste par une propriété de l'invariance d'échelle, caractéristique de phénomènes d'auto-organisation. L'objectif

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8

Wang, Ruoya. "Novel theoretical and experimental frameworks for multiscale quantification of arterial mechanics." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47718.

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The mechanical behavior of the arterial wall is determined by the composition and structure of its internal constituents as well as the applied traction-forces, such as pressure and axial stretch. The purpose of this work is to develop new theoretical frameworks and experimental methodologies to further the understanding of arterial mechanics and role of the various intrinsic and extrinsic mechanically motivating factors. Specifically, residual deformation, matrix organization, and perivascular support are investigated in the context of their effects on the overall and local mechanical behavio

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9

Brödling, Nils [Verfasser]. "Multiscale modeling of fracture and deformation in interface controlled materials / vorgelegt von Nils C, Brödling." Stuttgart : Max-Planck-Inst. für Metallforschung, 2007. http://d-nb.info/995392145/34.

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10

Thuramalla, Naveen. "MULTISCALE MODELING AND ANALYSIS OF FAILURE AND STABILITY DURING SUPERPLASTIC DEFORMATION -- UNDER DIFFERENT LOADING CONDITIONS." UKnowledge, 2004. http://uknowledge.uky.edu/gradschool_theses/323.

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Superplastic forming (SPF) is a valuable near net shape fabrication method, used to produce very complex, contoured and monolithic structures that are often lighter, stronger and safer than the assemblies they replace. However, the widespread industrial use of Superplastic (SP) alloys is hindered by a number of issues including low production rate and limited predictive capabilities of stability during deformation and failure. Failure during SPD may result from geometrical macroscopic instabilities and/or microstructural aspects. However, the available failure criteria are either based on geom

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11

Bertaud, Jeremie. "Multiscale modeling and simulation of deformation and failure mechanisms of hierarchical alpha-helical protein materials." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/55153.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2009.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 116-121).<br>Alpha-helical (AH) protein structures are critical building blocks of life, representing the key constituents of biological materials such as cells, hair, hoof and wool, where they assemble to form hierarchical structures. AHs play an important mechanical role in biological processes such as mechanotransduction, cell mechanics, tissue mechanics and remodeling. Whereas the mechanics of engineere

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12

Thuramalla, Naveen. "Multiscale modeling and analysis of failure and stability during super plastic deformation -- under different loading conditions." Lexington, Ky. : [University of Kentucky Libraries], 2004. http://lib.uky.edu/ETD/ukymeen2004t00171/NAVEEN.pdf.

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Thesis (m.s.)--University of Kentucky, 2004.<br>Title from document title page (viewed Jan. 5, 2005). Document formatted into pages; contains x, 112p. : ill. Includes abstract and vita. Includes bibliographical references.

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13

Zheng, Yi. "Compact multiscale modeling of carbon-based nano-transistors." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS518.

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Parmi les nouveaux matériaux émergents à base de carbone, le graphène est rapidement devenu un candidat idéal pour plusieurs applications en nanoélectronique. Dans ce contexte, différentes méthodes ont été proposées pour transformer ses propriétés électriques, et notamment supprimer sont point de dégénérescence de Dirac. L’ouverture d’un gap d’énergie peut ainsi conduire à l’usage du graphène dans des nano-transistors. Dans cette thèse, nous appliquons un modèle compact semi-analytique pour étudier deux types de nanotransistors à base de graphène: les transistors à nanorouban et les transistor

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14

CRIPPA, CHIARA. "Regional and local scale analysis of very slow rock slope deformations integrating InSAR and morpho-structural data." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2021. http://hdl.handle.net/10281/306309.

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Le deformazioni lente di versante in roccia (DGPV e grandi frane) sono fenomeni diffusi che interessano interi versanti e mobilizzano volumi di roccia anche di miliardi di metri cubi. La loro evoluzione è legata a processi di rottura progressiva sotto forzanti esterne e di accoppiamento idromeccanico, rispecchiate da un complesso processo di creep. Sebbene caratterizzate da bassi tassi di spostamento (fino a pochi cm / anno), queste instabilità di versante danneggiano infrastrutture e ospitano settori potenzialmente soggetti a differenziazione e collasso catastrofico. È quindi necessaria una r

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15

Tweedie, Catherine Anne. "Multiscale chemomechanics of polymer deformation under contact : predicting structure-property correlations from the bulk to the interphase." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44684.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2008.<br>Includes bibliographical references.<br>The development of nanoscale polymeric materials for mechanical applications necessitates advances in small-volume experimental techniques and analyses that reflect the viscoelastoplastic behavior of such materials. In this thesis, the time-dependence and response of homogeneous engineering polymers under confined contact loading are characterized as a function of polymer physical and structural properties. The validity of the time-independent met

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16

Allen, Robert. "Exploratory simulations of multiscale effects of deformation twinning on the mechanical behavior of FCC and HCP metals." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0167.

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Les méthodes conçues pour être incorporées dans des polycristaux de modélisation multi-échelles sont présentées dans ce travail en deux tâches. Ce travail contient des méthodes à moyenne échelle pour capturer les effets des interactions de dislocations de glissement rencontrant des joints de grains maclage et la croissance simultanée de plusieurs fractions de volume de grains maclage sur le durcissement mécanique et l’évolution de la texture. Celles-ci sont mises en œuvre dans un cadre de plasticité cristalline utilisant le code visco-plastic-self consistent de Los Alamos, VPSC-7. Présentés ic

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17

THOMAS, VINEET SUNNY. "A Multiscale Framework to Analyze Tricuspid Valve Biomechanics." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1542255754172363.

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18

Sato, Ayami. "A structural optimization methodology for multiscale designs considering local deformation in microstructures and rarefied gas flows in microchannels." Kyoto University, 2019. http://hdl.handle.net/2433/242495.

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19

Warshamana, Dewayalage Chathura Chandimal Wijerathne. "A new coarse-grained multiscale model for the numerical simulation of morphological changes of food-plant materials during drying." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/130784/1/Chathura%20Chandimal%20Wijerathne_Warshamana%20Dewayalage_Thesis.pdf.

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This research project is a step forward in predicting the bulk-scale deformations in food-plant materials during drying in a computationally efficient and accurate manner. In the proposed numerical modelling method, a novel force interaction field was introduced to represent the mechanics of a whole plant cell during drying through its centroid. By utilising this novel modelling approach, the distinct deformation profiles of several food-plant materials were revealed along with the impact of drying situations and features in the microstructure. The developed modelling framework has potential a

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20

Duong, Quang Thien. "Feasibility of agent-based modelling of articular cartilage including a conceptual representation of its structure." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/57989/1/Quang_Duong_Thesis.pdf.

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Articular cartilage is a complex structure with an architecture in which fluid-swollen proteoglycans constrained within a 3D network of collagen fibrils. Because of the complexity of the cartilage structure, the relationship between its mechanical behaviours at the macroscale level and its components at the micro-scale level are not completely understood. The research objective in this thesis is to create a new model of articular cartilage that can be used to simulate and obtain insight into the micro-macro-interaction and mechanisms underlying its mechanical responses during physiological

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21

Willeman, Héloïse. "Multi-scale characterization of deformation mechanisms of poly-ether-ether-ketone (PEEK) under tensile stretching." Electronic Thesis or Diss., Lyon, INSA, 2023. http://www.theses.fr/2023ISAL0006.

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L’objectif de cette thèse est d’établir le scénario multi-échelles de déformation du PEEK lorsqu’il est sollicité en traction uniaxiale. Préalablement à la mise en oeuvre d’échantillons de deux grades commerciaux de PEEK, les propriétés thermiques et mécaniques de ces matériaux ont été caractérisées. La température d’oubli thermodynamique ainsi que la sensibilité aux vitesses de refroidissement ont été établies. Des éprouvettes de traction ont été obtenues à partir de plaques thermocompressées, procédé choisi pour obtenir des morphologies les plus isotropes possibles. Les propriétés mécaniques

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22

Dylewski, Benoît. "Caractérisation expérimentale multi-échelles et multi-techniques du rail prélevé en service : de la déformation plastique sévère et des évolutions de microstructure à l'amorçage de fissures par Fatigue de Contact de Roulement." Electronic Thesis or Diss., Compiègne, 2016. http://www.theses.fr/2016COMP2324.

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Cette thèse est dédiée à la caractérisation de la déformation plastique sévère et des évolutions de la microstructure engendrées dans les rails en service, conduisant à leur fissuration par Fatigue de Contact de Roulement. L’amorçage de ces fissures en surface et leur propagation en profondeur mettent en jeu des phénomènes à l’échelle de la microstructure qui peuvent entrainer à l’échelle macroscopique des écaillages de surface ou même conduire à des ruptures brutales de rails en cours de fonctionnement. Pour améliorer la compréhension de ces différents phénomènes en sous surface, une méthodol

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23

Saadedine, Mahrez. "Micromécanique et macromécanique des matériaux souples renforcés par des nanoparticules inorganiques." Electronic Thesis or Diss., Université de Lille (2022-....), 2022. http://www.theses.fr/2022ULILN045.

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Les nanomatériaux sont actuellement largement utilisés dans le domaine bio-médical et jouent un rôle crucial dans les stratégies modernes pour remédier aux dysfonctionnements des tissus souples naturels tels que les tendons, les ligaments et les disques intervertébraux. Par ailleurs, les progrès de la biomécanique sont étroitement liés à l'élaboration de nouveaux biomatériaux tout en répondant à certains besoins spécifiques. Au cours des dernières décennies, une attention toute particulière a été portée à la combinaison de la nanotechnologie à d'autres domaines scientifiques dans le but d'obte

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24

Khan, Kamran Ahmed. "A Multiscale Model for Coupled Heat Conduction and Deformations of Viscoelastic Composites." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9431.

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This study introduces a multiscale model for analyzing nonlinear thermo-viscoelastic responses of particulate composites. A simplified micromechanical model consisting of four sub-cells, i.e., one particle and three matrix sub-cells is formulated to obtain the effective thermal and mechanical properties and time-dependent response of the composites. The particle and matrix constituents are made of isotropic homogeneous viscoelastic bodies undergoing small deformation gradients. Perfect bonds are assumed along the sub-cell⁰́₉s interfaces. The coupling between the thermal and mechanical response

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25

Romero, Pedro A. "Three-dimensional finite-deformation multiscale modeling of elasto-viscoplastic open-cell foams in the dynamic regime." 2008. http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.17091.

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26

Ahmed, Naveed [Verfasser]. "Multiscale modeling of deformation of polycrystalline metals / Ahmed, Naveed." 2010. http://d-nb.info/1007398922/34.

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27

Chou, Chia-Ching, and 周佳靚. "Multiscale analysis of adsorption-induced deformation of antilever-based biosensor." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/76614701094441854425.

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碩士<br>國立臺灣大學<br>土木工程學研究所<br>96<br>Microcantilever-based biosensors are rapidly becoming an enabling sensing technology for a variety of label-free biological applications due to their wide applicability, versatility and low cost. It is thus imperative for us to reveal the physical origin of adsorption-induced deformation, and to further analyze its implication of microscopic mechanisms on macroscopic deformation. The objective of this work is to develop a multi-scale theory that can analyze deformation of micro-cantilever beam subjected to bio-adsorption mechanisms calculated by ab- initio sim

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28

Todorov, Lyudmil V. "Multiscale morphology evolution of PET and its nanocomposites under deformation." Doctoral thesis, 2011. http://hdl.handle.net/1822/15904.

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O presente trabalho pretende investigar os mecanismos de desenvolvimento estrutural do PET e nanocompósitos de PET, durante a aplicação de deformações uniaxiais. São objectivos de trabalho estudar: • a influência estatística das variáveis de estiramento no desenvolvimento estrutural do PET em deformações efectuados a temperaturas acima de Tg (patamar de borracha), • o efeito da morfologia inicial do PET no seu desenvolvimento após deformação a frio, • o efeito da utilização de nanocargas (montemorilonite, MMT, dióxido de titânio, TiO2, e dióxido de sílica, SiO2) na morfologia e proprie

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29

"ROLE OF IMPURITIES ON DEFORMATION OF HCP CRYSTAL: A MULTISCALE APPROACH." Doctoral diss., 2014. http://hdl.handle.net/2286/R.I.27423.

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abstract: Commercially pure (CP) and extra low interstitial (ELI) grade Ti-alloys present excellent corrosion resistance, lightweight, and formability making them attractive materials for expanded use in transportation and medical applications. However, the strength and toughness of CP titanium are affected by relatively small variations in their impurity/solute content (IC), e.g., O, Al, and V. This increase in strength is due to the fact that the solute either increases the critical stress required for the prismatic slip systems ({10-10}<1-210>) or activates another slip system ((0001)<11-20

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30

Shih, Yu-Ching, and 石玉清. "First Principles Surface Stress Calculations and Multiscale Deformation Analysis of Self-assembled Monolayers Adsorbed on Microcantilever." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/61120117898625528985.

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博士<br>國立臺灣大學<br>應用力學研究所<br>101<br>Nanomechanical sensors, which are usually cantilever-shaped, have attracted increasing interests in the last decade as a promising tool for real-time and label-free detection of chemical gas and biomolecules. These adsorbates introduce surface stress and additional mass upon the detective layer of the sensors and sequentially transduce to a static displacement or a resonant frequency shift of the nanomechanical system. The induced surface stress is the key element to design the performance of the microcantilever sensors. The surface stress can be compressive o

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31

"Multiscale Modeling of Oxygen Impurity Effects on Macroscopic Deformation and Fatigue Behavior of Commercially Pure Titanium." Doctoral diss., 2018. http://hdl.handle.net/2286/R.I.48476.

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abstract: Interstitial impurity atoms can significantly alter the chemical and physical properties of the host material. Oxygen impurity in HCP titanium is known to have a considerable strengthening effect mainly through interactions with dislocations. To better understand such an effect, first the role of oxygen on various slip planes in titanium is examined using generalized stacking fault energies (GSFE) computed by the first principles calculations. It is shown that oxygen can significantly increase the energy barrier to dislocation motion on most of the studied slip planes. Then the Peier

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32

Burgin, Hugo Bonython. "A Multiscale Approach towards the Characterisation of Upper Crustal Deformation at Passive Continental Margins: A Case Study on the Otway Basin, Australia." Thesis, 2019. http://hdl.handle.net/2440/120858.

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This thesis presents a multiscale structural analysis of upper crustal deformation at a passive continental margin, using the Jurassic - Quaternary Otway Basin along Australia’s southern margin as a case study. Techniques of structural analyses across the micro (calcite twin, magnetic and porefabric analyses), meso (wellbore and outcrop natural fracture analysis) and macroscales (three-dimensional seismic interpretation) providing an effective means of characterising stress and strain across space and time. The integration of these investigative methods at a passive continental margin for the

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