Teses / dissertações sobre o tema "Micromechanic model"
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KALEEL, IBRAHIM. "Computationally-efficient multiscale models for progressive failure and damage analysis of composites". Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2729362.
Texto completo da fonteGARCIA, DE MIGUEL ALBERTO. "Hierarchical component-wise models for enhanced stress analysis and health monitoring of composites structures". Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2729658.
Texto completo da fonteWebber, Kyle Grant. "Effect of Domain Wall Motion and Phase Transformations on Nonlinear Hysteretic Constitutive Behavior in Ferroelectric Materials". Diss., Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22695.
Texto completo da fonteGu, 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.
Texto completo da fonteMcClain, Michael Patrick. "A micromechanical model for predicting tensile strength". Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-10052007-143117/.
Texto completo da fonteKeralavarma, Shyam Mohan. "A micromechanics based ductile damage model for anisotropic titanium alloys". [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2620.
Texto completo da fonteMihai, Iulia. "Micromechanical constitutive models for cementitious composite materials". Thesis, Cardiff University, 2012. http://orca.cf.ac.uk/24624/.
Texto completo da fonteBandorawalla, Tozer Jamshed. "Micromechanics-Based Strength and Lifetime Prediction of Polymer Composites". Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/26445.
Texto completo da fontePh. D.
Hu, Lianxin. "Micromechanics of granular materials : Modeling anisotropy by a hyperelastic-plastic model". Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI133.
Texto completo da fonteIn order to model the behavior of geometarials under complex loadings, several researches have done numerous experimental works and established relative constitutive models for decades. An important feature of granular materials is that the relationship between stress and strain especially in elastic domain is not linear, unlike the responses of typical metal or rubber. It has been also found that the stress-strain response of granular materials shows the characteristics of cross-anisotropy, as well as the non-linearities. Besides, the stress-induced anisotropy occurs expectedly during the process of disturbance on soils, for example, the loads or displacements. In this work, a new model which is a combination of Houlsby hyperelastic model and elastoplastic Plasol model was proposed. This new model took into account the non-linear response of stress and strain in both elastic and plastic domain, and the anisotropic elasticity was also well considered. Moreover, the overflow problem of plastic strain in plastic part was calibrated by a proper integration algorithm. Later, new model was verified by using numerical method and compared with laboratory experiments in axisymmetric triaxial conditions. The comparison results showed a good simulation effect of new model which just used one single set of parameters for a specific soil in different confining pressure situations. Then the analysis of new model internal variable, i.e., pressure exponent, illustrated that the value of pressure exponent which corresponds to the degree of anisotropy had an obvious effect on the stress-strain response. Moreover, this kind of effect is also affected by the density and drainage condition of samples. Basing on new model, a safety factor which refers to the second-order work criterion was adopted and tested in axisymmetric model and actual slope model. It showed that the negative value or dramatic decreasing of global normalized second-order work occurs accompanying with a local or global failure with a burst of kinetic energy. This feature of second-order work can also be affected by the variable pressure exponent. At last, new model was also compared with an elastoplastic model which considers both anisotropic elastic and anisotropic dilatancy, i.e., modified SANISAND model. Both advantages and disadvantages were illustrated in the comparison results
Abdelal, Gasser F. "A three-phase constitutive model for macrobrittle fatigue damage of composites". Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1485.
Texto completo da fonteTitle from document title page. Document formatted into pages; contains xiii, 183 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 180-183).
Hammad, Bashar Khalil. "Modeling, Simulation, and Analysis of Micromechanical Filters Coupled with Capacitive Transducers". Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/27744.
Texto completo da fontePh. D.
AZİZOĞLU, YAĞIZ. "Micromechanical Numeric Investigation of Fiber Bonds in 3D Network Structures". Thesis, KTH, Hållfasthetslära (Avd.), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-144036.
Texto completo da fonteMarklund, Erik. "Micromechanism based material models for natural fiber composites /". Luleå : Luleå University of Technology, 2005. http://epubl.luth.se/1402-1757/2005/84.
Texto completo da fonteHaberman, Michael Richard. "Frequency dependent micromechanical model of viscoelastic materials with coated inclusions". Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/16835.
Texto completo da fonteYI, WEITAO. "MICROMECHANICS BASED COMPOSITE MATERIAL MODELS FOR CRASHWORTHINESS FINITE ELEMENT SIUMLATION". University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin990541929.
Texto completo da fonteMasters, Nathan D. "A Self-Retracting Fully-Compliant Bistable Micromechanism". BYU ScholarsArchive, 2003. https://scholarsarchive.byu.edu/etd/86.
Texto completo da fonteHsu, Su-Yuen. "Finite element micromechanics modeling of inelastic deformation of unidirectionally fiber-reinforced composites". Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/39842.
Texto completo da fontePh. D.
Norouzi, Siavash. "A Micromechanical Model for Numerical Study of Rock Dilation and Ductility". Thesis, New Mexico Institute of Mining and Technology, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10688951.
Texto completo da fonteThe newly implemented micromechanical model in the CA2 computer program was studied in this work. The purpose was to address some of the issues in the numerical studies involving the Bonded Particle Model (BPM) including unrealistically low qu/σ t ratios, overall dilation behavior, and the post-failure response of rocks. The plasticity model allows both tensile and shear softening of the filling material at the contact points of the particles. It is shown that for a more ductile material, there is less scatter of micro-cracking at the peak load. Furthermore, the ductility parameter appears to be a good tool in controlling the ratio of compressive to uniaxial tensile strength of rock. While the ductility of the filling at the contact points of the particles has a drastic effect on the macroscopic post-peak rock behavior in the direct tensile testing, its role in dictating the post-peak rock behavior in compression is negligible and needs further study. The combined effect of ductility and initial micro-cracking on rock strength characteristics was studied as well. The numerical results suggest that the ratio of Brazilian to direct tensile strength of the simulated material is affected by the initial micro-crack intensity; this ratio is around 1 for a material with no initial micro-cracks but it gradually increases as the initial micro-crack intensity is increased. In terms of the overall dilation behavior, it is shown that the macro-dilation angle can be controlled by means of the micro-dilation angle in a positive correlation provided that the average grain size is sufficiently small or when a joint is involved. As the grain size increases, the resulted macro-asperities suppress the functionality of the micro-dilation angle and consequently, the macro-dilation angle cannot be controlled. Further, it is shown that the genesis pressure can help to govern the overall dilation behavior. This parameter is also able to control the post-peak behavior of a bonded particle system. It is shown that high values of the genesis pressure yield to more brittle BPM system with greater dilation angles and steeper post-peak curves.
Lee, Seon-Jae. "Micromechanical model for predicting the fracture toughess of functionally graded foams". [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0013705.
Texto completo da fontePilla, Srikanth. "Integration of Micromechanical and Probabilistic Analysis Models of Nanocomposites". University of Toledo / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1134422032.
Texto completo da fonteBai, Jie. "A homogenization based continuum plasticity-damage model for ductile fracture of materials containing heterogeneities". Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1211910660.
Texto completo da fonteAverill, Ronald C. "Nonlinear analysis of laminated composite shells using a micromechanics-based progressive damage model". Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-07282008-134259/.
Texto completo da fonteSreeranganathan, Arun. "Realistic micromechanical modeling and simulation of two-phase heterogeneous materials". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24607.
Texto completo da fonteCommittee Chair: Gokhale, Arun; Committee Member: Gall, Kenneth; Committee Member: Garmestani, Hamid; Committee Member: Kurtis, Kimberly; Committee Member: Thadhani, Naresh
Berner, Joseph Michael. "Finite element analysis of damage in fibrous composites using a micromechanical model". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA277226.
Texto completo da fonteThesis advisor(s): Young W. Kwon. "December 1993." Includes bibliographical references. Also available online.
Xiao, Long. "A structural micromechanical model of large deformation behavior of red blood cells". Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1458440.
Texto completo da fonteÅström, Jan. "Micromechanical models of the elasticity and fracture of fibre networks /". Åbo : Åbo akademi, 1996. http://catalogue.bnf.fr/ark:/12148/cb41444383f.
Texto completo da fonteAMINJIKARAI, SRINIVASA BABU. "A STRAIN RATE DEPENDENT 3D MICROMECHANICAL MODEL FOR FINITE ELEMENT SIMULATIONS OF PLAIN WEAVE COMPOSITE STRUCTURES". University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1070549522.
Texto completo da fonteJiang, Tianci. "Impact & penetration studies simplified models and and materials design from AB initio methods /". Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10443.
Texto completo da fonteKilic, Mustafa Hakan. "Three-dimensional micromechanical models for the nonlinear analysis of pultruded composite structures". Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/20735.
Texto completo da fonteParietti, Lucie. "Micromechanical finite element model for constitutive elastoplastic analysis of unidirectional fiber-reinforced composites". Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06232009-063447/.
Texto completo da fonteMacchi, Juan Agustin. "Phase transformations, microstructure heterogeneities and resulting mechanical properties in as-quenched and tempered martensitic steels". Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0248.
Texto completo da fonteMartensitic steels have been known and used for millennia now, but the origins of their strength and work hardening have remained a source of controversy. Since few years, the understanding of their mechanical behavior is changing paradigm. Many researchers have put into evidence the interest not to describe lath martensite as an homogeneous microstructure but more as a multiphase aggregate, a composite, resulting from the sequential nature of the phase transformation at low temperature. According to such new schemes, the martensite behavior is controlled by the microstructural heterogeneities, ie. the spatial distribution of lath sizes, of dislocations, of carbon segregations and of carbides and not only by their mean values. To these observable microstructural elements are added large distributions of hydrostatic and deviatoric internal stresses resulting from the displacive phase transformation process. This work contributes to this new movement by providing a quantitative description of these distributions in as-quenched and further tempered martensitic steels and their impact on their mechanical behaviors thanks to a complete micromechanical approach.We have first developed a methodology to determine the dislocation densities in martensite and in austenite along the transformation by in situ HEXRD experiments. Based on a metallurgical reasoning, the spatial dislocation density distribution as well as its associated hardening were estimated for the first time. In situ HEXRD tempering experiments were also performed to characterize the recovery from the as-quenched state. An original modeling approach accounting for the spatial distribution of dislocations was set up to predict their density decrease during a heat treatment.In the same way, the microtextures of the studied microstructures were investigated by SEM-EBSD in order to assess the size distribution of the different features of martensite, as laths, blocks, packets and prior austenite grains. A statistical approach combining this latter contribution to the hardening with the one associated with dislocations explains successfully the observed distribution of the local yield strength in the as-quenched microstructures.In situ HEXRD tempering experiments and additional APT and TEM observations were used to characterize also the respective precipitation state of transition carbides and cementite as well as the carbon segregations along heat treatments. All this experimental work has served to develop and calibrate a phase transformation model to calculate carbon segregation on dislocations, transition carbides and cementite precipitation states. Such model was for instance able to predict the suppression of transition carbide precipitation in very low carbon steels. The investigation of tempering is necessary to understand the strengthening due the sole carbon in martensite.Finally, our original micromechanical model describing the martensite behavior as an extended elastic/plastic transition accounts for the previous combined hardening due to size effects and dislocations, the distribution of internal stresses due to the transformation and the tempering state (relaxation, recovery, segregation and precipitation state). The model successfully explains the strength and work-hardening of the studied steels (as quenched and tempered)
Song, Injun. "Damage analysis in asphalt concrete mixtures based on parameter relationships". Texas A&M University, 2004. http://hdl.handle.net/1969.1/1300.
Texto completo da fonteEstrada, Jonathan Bartholomew. "Scaling the rock : a micromechanical model for the elastic properties of hydrated cement pastes". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/101860.
Texto completo da fonteCataloged from PDF version of thesis.
Includes bibliographical references (pages 61-62).
Cement is the most widely produced material worldwide. However, the understanding on how its nanoscale composition affect its microscale mechanical properties is limited. In this thesis, a micromechanical model for the purpose of cement hydration simulation was developed and tested using HYMOSTRUC3D hydration software and a micromechanical particle with interphase model developed by Deng and Van Vliet. It was then tested against empirical micro- and nanoindentation tests done on samples synthesized, cured, and prepared in situ. Preliminary mechanical calculations coupled with the hydration software show good agreement with experimental data. Additionally, predicted ranges of effective particle moduli values were found in nanoindentation testing. These observations support the validity of treating high density C-S-H as an interphase between low density C-S-H and clinker particles.
by Jonathan Bartholomew Estrada.
S.B.
Varadarajan, Bhadri Narayanan. "MICROMECHANICS OF DEBOND GROWTH AND INTERFACIAL WEAR UNDER FATIGUE LOADING IN A TRANSPARENT CERAMIC COMPOSITE". University of Cincinnati / OhioLINK, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=ucin975352464.
Texto completo da fonteGuo, Jia-Yuarn. "Simplified micromechanical models for analysis of interface debonding in a fibrous composite". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA306624.
Texto completo da fonteDharmasena, Sajith Mevan. "A Multi-Channel Micromechanical Cantilever for Advanced Multi-Modal Atomic Force Microscopy". The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1565883484835926.
Texto completo da fonteZhang, Ningning. "A micromechanical study of the Standard Penetration Test". Doctoral thesis, Universitat Politècnica de Catalunya, 2020. http://hdl.handle.net/10803/668841.
Texto completo da fonteEsta tesis explora el potencial de los modelos basados en el método de elementos discretos (DEM) para estudiar el sondeo dinámico de materiales granulares, considerando propiedades realistas a escala de partículas. La técnica de cámara de calibración virtual, basada en el método de elemento discreto, se aplica para estudiar la prueba de penetración estándar (SPT). Se utiliza un enfoque de macroelemento para representar una barra impulsada con un impacto como los aplicados para realizar SPT. La varilla se introduce en una cámara llena de un análogo discreto escalado de arena de cuarzo. Las propiedades de contacto del análogo discreto se calibran simulando dos pruebas triaxiales de baja presión. La varilla se acciona cambiando la energía de entrada y controlando la densidad inicial y el estrés de confinamiento. La normalización del recuento de golpes basado en energía se muestra efectiva. Los resultados obtenidos están en buen acuerdo cuantitativo con relaciones basadas en experimentos bien aceptadas entre recuento de golpes, densidad y sobrecarga. Se realiza un balance energético integral de la cámara de calibración virtual. El balance de energía se aplica por separado a la varilla impulsada y al sistema de cámara, dando una descripción detallada de todos los diferentes términos de energía. Se investiga la caracterización de la evolución y distribución de cada componente energético. Parece que la energía de entrada de prueba SPT se disipa principalmente en fricción. La interpretación basada en la energía de la respuesta dinámica SPT propuesta por Schnaid et al. (2017) luego se valida en comparaciones entre los resultados de penetración estática y dinámica. Además, la investigación en microescala proporciona información importante sobre los mecanismos de disipación de energía. Un modelo de contacto de trituración DEM bien establecido y un modelo de contacto hertziano aproximado se combinan para incorporar ambos efectos en un modelo de contacto único. La técnica eficiente de modelo de contacto definido por el usuario (UDCM) se utiliza para la implementación del modelo de contacto. Los estudios paramétricos exploran el efecto de la rugosidad de las partículas en el evento de trituración de partículas individuales. El modelo se usa para recalibrar las propiedades de contacto de la arena de cuarzo, pudiendo usar propiedades de contacto realistas y luego capturar correctamente el comportamiento de carga y descarga y la evolución de la distribución del tamaño de partícula. Los resultados de la cámara de calibración se explotan para investigar la relación entre la prueba de penetración estática y dinámica. Esto se hace primero para materiales irrompibles y luego para materiales triturables y desmenuzables. Se muestra que la resistencia de la punta medida en condiciones de penetración dinámica de impacto es muy cercana a la de condiciones de velocidad constante, por lo tanto, respalda propuestas recientes para relacionar los resultados de CPT y SPT. También se muestra que la resistencia a la penetración se reduce si se permite que las partículas se rompan, particularmente cuando también se considera la aspereza.
Lukhi, Mehul. "Micromechanical Simulation of Fatigue in Nodular Cast Iron". Technische Universität Bergakademie Freiberg, 2020. https://tubaf.qucosa.de/id/qucosa%3A72791.
Texto completo da fonteKim, Jinkoo. "Micromechanical model for damage and failure of brittle materials : application to polycrystalline ice and concrete". Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11389.
Texto completo da fonteHaberman, Keith Rosakis Ares J. Rosakis Ares J. "A micromechanical constitutive model for the dynamic response of brittle materials "Dynamic response of marble" /". Diss., Pasadena, Calif. : California Institute of Technology, 2000. http://resolver.caltech.edu/CaltechETD:etd-12182007-113248.
Texto completo da fonteMorrissey, Ryan J. "Strain accumulation and shakedown in fatigue of Ti-6A1-4V by Ryan J Morrissey". Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/17144.
Texto completo da fonteSuwatnodom, Prechaporn. "3-D micromechanical damage models, fiber pullout models and fracture toughness of discontinuous steel fiber reinforced cementitious composites". Diss., Restricted to subscribing institutions, 2008. http://proquest.umi.com/pqdweb?did=1562125051&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
Texto completo da fonteRome, Jacob I. "Experimental characterization and micromechanical modeling of the dynamic response and failure modes of concrete /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2002. http://wwwlib.umi.com/cr/ucsd/fullcit?p3061638.
Texto completo da fonteKhan, Kamran-Ahmed. "A time integration scheme for stress - temperature dependent viscoelastic behaviors of isotropic materials". [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1146.
Texto completo da fonteGydemo, Jessica. "Simulation of injection molded fiber reinforced polymers". Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-62758.
Texto completo da fonteGili, Ripoll José Antonio. "Modelo microestructural para medios granulares no saturados". Doctoral thesis, Universitat Politècnica de Catalunya, 1988. http://hdl.handle.net/10803/5916.
Texto completo da fonteA) Un estudio de las propiedades básicas del suelo no saturado (tipo limo) a escala microestructural, incluyendo esqueleto sólido, fase liquida y fase gaseosa.
B) Elaboración de un modelo conceptual discontinuo de comportamiento. La geometría interna esta construida por partículas, agua retenida en forma de meniscos alrededor de los contactos y aire ocupando los restantes poros. La interfase liquido gas esta gobernada por la succión y la tensión superficial. Los meniscos tienen un efecto rigidizador del esqueleto.
Se observa la posible redistribución de la humedad y del aire, quedando acoplados en definitiva los aspectos mecánicos y de flujo.
C) En base a lo anterior, implementación de un modelo numérico discontinuo de ensayo de comportamiento basado en ordenador. Se ha adaptado y modificado el D.E.M. de P.A. Cundall (diferencias finitas explicitas en el tiempo), indicado en el caso que se trata, con no-linealidades geométricas. Se han desarrollado importantes algoritmos de control geométrico.
D) Verificación parcial del modelo y aplicación a casos típicos en suelo no saturado, especialmente el colapso.
En conjunto es una herramienta útil para su estudio y permite apreciar algunos interesantes mecanismos de actuación de la succión a escala microscópica.
Gili, Ripoll Josep Antoni. "Modelo microestructural para medios granulares no saturados". Doctoral thesis, Universitat Politècnica de Catalunya, 1988. http://hdl.handle.net/10803/5916.
Texto completo da fonteThomas, Michael Andrew. "Framework for Cohesive Zone Model Based Multiscale Damage Evolution in a Fatigue Environment". Wright State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=wright1308257790.
Texto completo da fonteOikonomidis, Fokon Th. "Prediction of crack propagation in natural gas transmission pipelines by means of micromechanics and strain rate dependent models". Thesis, University of Bristol, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.541649.
Texto completo da fonteOberhardt, Tobias. "A micromechanical model for the nonlinearity of microcracks in random distributions and their effect on higher harmonic Rayleigh wave generation". Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54365.
Texto completo da fonte