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Dissertations / Theses on the topic 'Representative Volume Element (RVE)'

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Published: 4 June 2021
Last updated: 7 September 2023

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1

Fusari, Elena. "Studio e Realizzazione del Modello RVE (Representative Volume Element) per componenti polimerici realizzati in stampa 3D FDM." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24632/.

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A fianco ai metodi più tradizionali, fin ora utilizzati, le tecnologie additive hanno subito negli ultimi anni una notevole evoluzione nella produzione di componenti. Esse permettono un ampio di range di applicazioni utilizzando materiali differenti in base al settore di applicazione. In particolare, la stampa 3D FDM (Fused Deposition Modeling) rappresenta uno dei processi tecnologici additivi più diffusi ed economicamente più competitivi. Gli attuali metodi di analisi agli elementi finiti (FEM) e le tecnologie CAE (Computer-Aided Engineering) non sono in grado di studiare modelli 3D di compon
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2

Hitti, Karim. "Direct numerical simulation of complex Representative Volume Elements (RVEs) : Generation, Resolution and Homogenization." Paris, ENMP, 2011. http://www.theses.fr/2011ENMP0054.

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L'influence des hétérogénéités microstructurales sur le comportement d'un matériau est devenue une problématique industrielle de première importance, cet état de fait explique l'engouement actuel pour la prise en compte de ces hétérogénéités dans le cadre de la modélisation numérique. Ainsi, de nombreuses méthodes pour représenter de manière digitale un matériau virtuel statistiquement équivalent à la microstructure réelle et pour connecter cette représentation à des calculs éléments finis se sont développées ces dernières années. Les travaux réalisés durant cette thèse s'inscrivent en grande
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3

Baghbanan, Alireza. "Scale and Stress Effects on Hydro-Mechanical Properties of Fractured Rock Masses." Doctoral thesis, KTH, Teknisk geologi och geofysik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4772.

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In this thesis, the effects of size and stress on permeability, deformability and strength of fractured rock masses are investigated. A comparison study was carried out to examine the effects of considering, or not considering, the correlation between distributions of fracture apertures and fracture trace lengths on the hydro-mechanical behavior of fractured rocks. The basic concepts used are the fundamental principles of the general theory of elasticity, Representative Elementary Volume (REV), the tensor of equivalent permeability, and the strength criteria of the fractured rocks. Due to the
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4

Noorian-Bidgoli, Majid. "Strength and deformability of fractured rocks." Doctoral thesis, KTH, Mark- och vattenteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-155719.

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This thesis presents a systematic numerical modeling framework to simulate the stress-deformation and coupled stress-deformation-flow processes by performing uniaxial and biaxial compressive tests on fractured rock models with considering the effects of different loading conditions, different loading directions (anisotropy), and coupled hydro-mechanical processes for evaluating strength and deformability behavior of fractured rocks. By using code UDEC of discrete element method (DEM), a series of numerical experiments were conducted on discrete fracture network models (DFN) at an established r
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5

Kanit, Toufik. "Notion of representative volume element for heterogeneous materials: statistical and numerical approach." Phd thesis, École Nationale Supérieure des Mines de Paris, 2003. http://tel.archives-ouvertes.fr/tel-00005751.

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6

Hill, Richard Lee Sr. "Development of a representative volume element of lithium-ion batteries for thermo-mechanical integrity." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67781.

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Thesis (Nav. E. and S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 67-69).<br>The importance of Lithium-ion batteries continues to grow with the introduction of more electronic devices, electric cars, and energy storage. Yet the optimization approach taken by the manufacturers and system designers is one of test and build, an approach that nearly every other industry has long abandoned. A computational model is required to reduce the expensive build-test cycle and allow saf
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7

Willoughby, Natasha. "Dynamic homogenization for the elastic properties of periodic and random composites." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/dynamic-homogenization-for-the-elastic-properties-of-periodic-and-random-composites(da82e607-bc1f-40e9-8e62-ec5fbca1f68f).html.

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In this thesis we are interested in the propagation of low-frequency linear elastic waves through composite materials. We use a variety of dynamic homogenization techniques to find the effective elastic properties of some composites. We consider composites with isotropic phases for ease of exposition but the theory could easily be extended to anisotropic inclusions or host.We use a Representative Volume Element approach with the Method of Asymptotic Homogenization to model a random fibre-reinforced composite. The fibres are all aligned in the same direction and are taken to be of infinite exte
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8

Zhou, Zhiqiang. "Multiple-Scale Numerical Analysis of Composites Based on Augmented Finite Element Method." Scholarly Repository, 2010. http://scholarlyrepository.miami.edu/oa_dissertations/75.

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Advanced composites are playing a rapidly increasing role in all fields of material and structural related engineering practices. Damage tolerance analysis must be a critical integral part of composite structural design. The predictive capabilities of existing models have met with limited success because they typically can not account for multiple damage evolution and their coupling. As a result, current composite design is heavily dependent upon lengthy and costly test programs and empirical design methods. There is an urgent need for efficient numerical tools that are capable of analyzing th
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9

Min, Ki-Bok. "Determination of equivalent hydraulic and mechanical properties of fractured rock masses using the distinct element method." Licentiate thesis, KTH, Land and Water Resources Engineering, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1550.

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<p>The equivalent continuum approach uses equivalent propertiesof rock mass as the input data for a continuum analysis. Thisis a common modeling method used in the field of rock mechanicsand hydrogeology. However, there are still unresolvedquestions; how can the equivalent properties be determined andis the equivalent continuum approach suitable for modeling thediscontinuous fractured rock mass.</p><p>The purpose of this paper is to establish a methodology todetermine the equivalent hydraulic and mechanical properties offractured rock masses by explicit representations of stochasticfracture sy
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10

Kouach, Mona. "Methods for modelling lattice structures." Thesis, KTH, Hållfasthetslära (Avd.), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-260498.

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The application of lattice structures have become increasingly popular as additive manufacturing (AM) opens up the possibility to manufacture complex configurations. However, modelling such structures can be computationally expensive. The following thesis has been conducted in order for the department of Structural Analysis, at SAAB in Järfälla, to converge with the future use of AM and lattice structures. An approach to model lattice structures using homogenization is presented where three similar methods involving representative volume element (RVE) have been developed and evaluated. The sti
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11

McConaha, Matthew. "Graded Lattice Structure Density Optimization for Additive Manufacturing." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1523634949822303.

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12

Soares, Gilson Francisco Paz. "Homogeneização de um material composto formado por uma matriz polimérica com uma segunda fase particulada." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2010. http://hdl.handle.net/10183/30141.

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O estudo numérico do comportamento estrutural de materiais compostos apresenta-se, desde os últimos anos, como um campo muito fértil de pesquisas, o que justifica o crescimento exponencial de trabalhos científicos nesta área. Atualmente é possível desenhar as propriedades físicas do material adequando-os ao uso que se queira dar a eles. Especificamente quanto às propriedades mecânicas vinculadas a função estrutural que o material em estudo possa ter, estas podem, na atualidade, ser quantificadas, modificadas e otimizadas. No presente trabalho, explora-se um material composto formado por uma ma
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13

Andrade, Paula Viana Queiroz. "Estudo do comportamento mecânico de microestruturas de materiais compósitos com matriz metálica." Universidade Federal de Goiás, 2017. http://repositorio.bc.ufg.br/tede/handle/tede/7710.

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Submitted by Cássia Santos (cassia.bcufg@gmail.com) on 2017-08-30T13:26:19Z No. of bitstreams: 2 Dissertação - Paula Viana Queiroz Andrade - 2017.pdf: 2686282 bytes, checksum: d828cc8979cf594c108b844e7b806230 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2017-09-15T13:36:35Z (GMT) No. of bitstreams: 2 Dissertação - Paula Viana Queiroz Andrade - 2017.pdf: 2686282 bytes, checksum: d828cc8979cf594c108b844e7b806230 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5
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14

Sreeranganathan, 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.

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Thesis (Ph.D.)--Materials Science and Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: Gokhale, Arun; Committee Member: Gall, Kenneth; Committee Member: Garmestani, Hamid; Committee Member: Kurtis, Kimberly; Committee Member: Thadhani, Naresh
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15

Zhu, Wenqi. "Effective elastic properties of foams : Morphological study and micromechanical modeling." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI043.

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Les matériaux cellulaires poreux de type mousse présentent un grand intérêt pour de nombreuses applications. Leurs propriétés thermiques, mécaniques, acoustiques dépendent fortement de leur microstructure complexe. Afin de mieux comprendre la relation microstructure/propriétés mécaniques de ces matériaux, une modélisation micromécanique basée sur une méthode d’homogénéisation périodique et le lemme de Hill est proposée pour prédire les propriétés élastiques effectives de ces matériaux. Une approche basée sur le diagramme de Voronoï est utilisée pour générer des structures de mousse périodiques
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16

Dirrenberger, Justin. "Propriétés effectives de matériaux architecturés." Phd thesis, Ecole Nationale Supérieure des Mines de Paris, 2012. http://pastel.archives-ouvertes.fr/pastel-00797363.

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Les matériaux architecturés font émerger de nouvelles possibilités en termes de propriétés structurales et fonctionnelles, repoussant ainsi les limites des cartes d'Ashby. Le terme "matériaux architecturés" inclus toute microstructure conçue de façon astucieuse, de sorte que certaines de ses propriétés soient optimisées. Les exemples sont nombreux : composites fibreux et particulaires, matériaux cellulaires, structures sandwiches, matériaux tissés, structures treillis, etc. Un enjeu de taille pour l'emploi de tels matériaux est la prédiction de leurs propriétés effectives. Dans ce travail, deu
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17

De, francqueville Foucault. "Etude micromécanique du lien entre endommagement local et comportement macroscopique de propergols solides." Thesis, Institut polytechnique de Paris, 2019. http://www.theses.fr/2019IPPAX004.

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L'objectif de ce projet de recherche est le développement de simulations numériques de l'endommagement de propergols solides, qui sont dédiés à la propulsion anaérobique, afin d'identifier quelles propriétés affectent leur comportement. Pour étudier l'effet de la géométrie des différentes particules énergétiques, des microstructures 3D sont générées avec une dispersion aléatoire d'inclusions monomodales, sphériques ou polyédriques, à très forte fraction volumique (55%). Dans le cas des sphères, les propriétés élastiques des volumes élémentaires représentatifs (VER) sont confrontées à un modèle
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18

Donner, Hendrik. "FEM-basierte Modellierung stark anisotroper Hybridcord-Elastomer-Verbunde." Doctoral thesis, Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-229188.

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Zur Analyse der Beanspruchungen in textilverstärkten Elastomerbauteilen wie Luftfedern, Reifen, Riemen und Schläuchen sind Berechnungsmodelle mit einer feinen Balance zwischen Genauigkeit und Effizienz erforderlich. Die großen Deformationen, stark anisotropen Struktureigenschaften und kleinen Abmessungen der Festigkeitsträger gegenüber denen des Bauteils bedürfen einerseits einer detaillierten Modellierung, andererseits sind die kritischen Bereiche in diesen Bauteilen räumlich stark begrenzt, sodass eine Reduktion des Berechnungsaufwands erstrebenswert ist. Diese Modellreduktion führt zu Simul
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19

Padhee, Srikant Sekhar. "A Synergetic Micromechanics Model For Fiber Reinforced Composites." Thesis, 2011. https://etd.iisc.ac.in/handle/2005/2381.

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Composite materials show heterogeneity at different length scales. hence concurrent multiscale analysis is the only reliable method to analyze them. But unfortunately there is no concurrent multi-scale strategy that is efficient, and accurate while addressing all kinds of problems. This lack of reliability is partly because there is no micro-mechanical model which inherently keeps all relevent global information with it. This thesis tries to fill this gap. The presented micro-mechanical model not only homogenizes the micro-structure but also keeps the global information with it. Most of the m
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20

Padhee, Srikant Sekhar. "A Synergetic Micromechanics Model For Fiber Reinforced Composites." Thesis, 2011. http://etd.iisc.ernet.in/handle/2005/2381.

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Composite materials show heterogeneity at different length scales. hence concurrent multiscale analysis is the only reliable method to analyze them. But unfortunately there is no concurrent multi-scale strategy that is efficient, and accurate while addressing all kinds of problems. This lack of reliability is partly because there is no micro-mechanical model which inherently keeps all relevent global information with it. This thesis tries to fill this gap. The presented micro-mechanical model not only homogenizes the micro-structure but also keeps the global information with it. Most of the mi
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21

Chiou, Wen-fu, and 邱文甫. "FEM Analysis on the Prediction of Mechanical Properties of Mg-Al2O3p Particle Reinforced Composite from a Representative Volume Element." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/19580548014949289739.

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碩士<br>國立中正大學<br>機械工程所<br>96<br>High strength and weight reduction are the primary material qualification in automobile industry and aviation technology as well. Because of the fabrication of the composites selected Mg and Mg alloy as the matrix to improve the elastic modulus, yielding strength, and tensile strength, so the simulation of the Mg-Al2O3p composites had been investigated to observed the elastic modulus. The single Representative Volume Element (RVE) cube model was used to simulate the unit cell structure of the composite with both conditions of numerical homogenization Techniqu
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22

Pagani, Claudio. "Modeling of Masonry Structures at Multiple Scales." Doctoral thesis, 2021. http://hdl.handle.net/2158/1248578.

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Masonry represents the material used in the great majority of the world-building heritage structures. Reliable tools for analysis of masonry structures are needed not only for seismic vulnerability assessment but also to properly design interventions to restore and strengthen existing buildings, which deserve to be preserved. Masonry is a nonlinear, heterogeneous, and anisotropic material whose properties strongly depend on its microstructure, typically composed of two phases, blocks and mortar, and on the way it is assembled. To simulate the mechanical behavior of masonry structures, num
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23

(10712601), Siming Ma. "HIGH STRENGTH ALUMINUM MATRIX COMPOSITES REINFORCED WITH AL3TI AND TIB2 IN-SITU PARTICULATES." Thesis, 2021.

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<p>Aluminum alloys have broad applications in aerospace, automotive, and defense industries as structural material due to the low density, high-specific strength, good castability and formability. However, aluminum alloys commonly suffer from problems such as low yield strength, low stiffness, and poor wear and tear resistance, and therefore are restricted to certain advanced industrial applications. To overcome the problems, one promising method is the fabrication of aluminum matrix composites (AMCs) by introducing ceramic reinforcements (fibers, whiskers or particles) in the metal matrix. A
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24

(5929553), Ernesto Camarena. "Multiscale Continuum Modeling of Piezoelectric Smart Structures." Thesis, 2019.

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Among the many active materials in use today, piezoelectric composite patches have enabled notable advances in emerging technologies such as disturbance sensing, control of flexible structures, and energy harvesting. The macro fiber composite (MFC), in particular, is well known for its outstanding performance. Multiscale models are typically required for smart-structure design with MFCs. This is due to the need for predicting the macroscopic response (such as tip deflection under a transverse load or applied voltage) while accounting for the fact that the MFC has microscale details. Current mu
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25

(6411908), Ning Liu. "Global and Local Buckling Analysis of Stiffened and Sandwich Panels Using Mechanics of Structure Genome." Thesis, 2019.

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Mechanics of structure genome (MSG) is a unified homogenization theory that provides constitutive modeling of three-dimensional (3D) continua, beams and plates. In present work, the author extends the MSG to study the buckling of structures such as stiffened and sandwich panels. Such structures are usually slender or flat and easily buckle under compressive loads or bending moments which may result in catastrophic failure.<div><br><div>Buckling studies of stiffened and sandwich panels are found to be scattered. Most of the existed theories employ unnecessary assumptions or only apply to certai
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