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Dissertations / Theses on the topic 'Phase Field Fracture'

Author: Grafiati

Published: 30 June 2021

Last updated: 25 July 2025

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1

Agrawal, Vaibhav. "Multiscale Phase-field Model for Phase Transformation and Fracture." Research Showcase @ CMU, 2016. http://repository.cmu.edu/dissertations/850.

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We address two problems in this thesis. First, a phase-field model for structural phase transformations in solids and second, a model for dynamic fracture. The existing approaches for both phase transformations and fracture can be grouped into two categories. Sharp-interface models, where interfaces are singular surfaces; and regularized-interface models, such as phase-field models, where interfaces are smeared out. The former are challenging for numerical solutions because the interfaces or crack needs to be explicitly tracked, but have the advantage that the kinetics of existing interfaces o

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2

Abdollahi, Amir. "Phase-field modeling of fracture in ferroelectric materials." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/285833.

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The unique electro-mechanical coupling properties of ferroelectrics make them ideal materials for use in micro-devices as sensors, actuators and transducers. Nevertheless, because of the intrinsic brittleness of ferroelectrics, the optimal design of the electro-mechanical devices is strongly dependent on the understanding of the fracture behavior in these materials. Fracture processes in ferroelectrics are notoriously complex, mostly due to the interactions between the crack tip stress and electric fields and the localized switching phenomena in this zone (formation and evolution of domains of

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3

Muixí, Ballonga Alba. "Locally adaptive phase-field models and transition to fracture." Doctoral thesis, Universitat Politècnica de Catalunya, 2020. http://hdl.handle.net/10803/669747.

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This thesis proposes a new computational model for the efficient simulation of crack propagation, through the combination of a phase-field model in small subdomains around crack tips and a discontinuous model in the rest of the domain. The combined model inherits the advantages of both approaches. The phase-field model determines crack propagation at crack tips, and the discontinuous model explicitly describes the crack elsewhere, enabling to use a coarser discretization and thus reducing the computational cost. In crack-tip subdomains, the discretization is refined to capture the phase-fiel

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4

Cavuoto, Riccardo. "Phase-field and reduced peridynamic theories for fracture problems." Doctoral thesis, Università degli studi di Trento, 2021. http://hdl.handle.net/11572/322187.

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Several aspects of fracture nucleation and growth in brittle porous ceramics and in thin films are investigated, through analytical, numerical modelling, and experimental validation. A mechanical experimental characterization has been developed for a porous ceramic, namely, a 3D apatite, characterised by an oriented porosity and used for biomedical applications. The ceramic is produced from wood, so that the resulting porosity evidences a multi-scale nature, a feature determining peculiar failure mechanisms and an unprecedented porosity/strength ratio. In particular, the material exhibits an e

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5

Ziaei-Rad, Vahid. "Phase field approach to fracture : massive parallelization and crack identification." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/396154.

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The phase field method has proven to be an important tool in computational fracture mechanics in that it does not require complicated crack tracking and is able to predict crack nucleation and branching. However, the computational cost of such a method is high due to a small regularization length parameter, which in turns restricts the maximum element size that can be used in a finite element mesh. In this work, we developed a massively parallel algorithm on the graphical processing unit (GPU) to alleviate this difficulty in the case of dynamic brittle fracture. In particular, we adopted the s

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6

Omatuku, Emmanuel Ngongo. "Phase field modeling of dynamic brittle fracture at finite strains." Master's thesis, Faculty of Engineering and the Built Environment, 2019. http://hdl.handle.net/11427/30172.

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Fracture is the total or partial separation of an initially intact body through the propagation of one or several cracks. Computational methods for fracture mechanics are becoming increasingly important in dealing with the nucleation and propagation of these cracks. One method is the phase field approach, which approximates sharp crack discontinuities with a continuous scalar field, the so-called phase field. The latter represents the smooth transition between the intact and broken material phases. The evolution of the phase field due to external loads describes the fracture process. An origin

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7

Schlueter, Alexander [Verfasser], and Charlotte [Akademischer Betreuer] Kuhn. "Phase Field Modeling of Dynamic Brittle Fracture / Alexander Schlueter ; Betreuer: Charlotte Kuhn." Kaiserslautern : Technische Universität Kaiserslautern, 2018. http://d-nb.info/116213397X/34.

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8

Deogekar, Sai Sharad. "A Computational Study of Dynamic Brittle Fracture Using the Phase-Field Method." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439455086.

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9

Tanne, Erwan. "Variational phase-field models from brittle to ductile fracture : nucleation and propagation." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLX088/document.

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Les simulations numériques des fissures fragiles par les modèles d’endommagement à gradient deviennent main- tenant très répandues. Les résultats théoriques et numériques montrent que dans le cadre de l’existence d’une pre-fissure la propagation suit le critère de Griffith. Alors que pour le problème à une dimension la nucléation de la fissure se fait à la contrainte critique, cette dernière propriété dimensionne le paramètre de longueur interne.Dans ce travail, on s’attarde sur le phénomène de nucléation de fissures pour les géométries communément rencontrées et qui ne présentent pas de solut

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10

Mersel, Lamia. "Phase field model for dynamic damage and fracture analysis through a fully explicit time integration." Electronic Thesis or Diss., Ecole centrale de Nantes, 2025. http://www.theses.fr/2025ECDN0005.

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Malgrè les avancées majeures en dynamique de la rupture, ce mécanisme reste une problématique industrielle d’actualité due à son caractére souvent imprévisible. Les méthodes numériques sont des approches de plus en plus déployées pour aider à une meilleure compréhension de ces mécanismes. Les modèles à gradient d’endommagement ont connu un intérêtcroissant pour modéliser la rupture fragile quasistatique et commence à être de plus en plus utiliser pour de la rupture dynamique. Son utilisation reste limiter à l’échelle du laboratoire. Ces modèles requièrent un raffinement de maillagenon négligea

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11

Parrinello, Antonino. "A rate-pressure-dependent thermodynamically-consistent phase field model for the description of failure patterns in dynamic brittle fracture." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:c6590f4f-f4e2-40e3-ada1-49ba35c2a594.

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The investigation of failure in brittle materials, subjected to dynamic transient loading conditions, represents one of the ongoing challenges in the mechanics community. Progresses on this front are required to support the design of engineering components which are employed in applications involving extreme operational regimes. To this purpose, this thesis is devoted to the development of a framework which provides the capabilities to model how crack patterns form and evolve in brittle materials and how they affect the quantitative description of failure. The proposed model is developed withi

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12

Kuhn, Charlotte [Verfasser], and Ralf [Akademischer Betreuer] Müller. "Numerical and Analytical Investigation of a Phase Field Model for Fracture / Charlotte Kuhn. Betreuer: Ralf Müller." Kaiserslautern : Technische Universität Kaiserslautern, 2013. http://d-nb.info/1035405563/34.

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13

Bhowmick, Sauradeep. "Advanced Smoothed Finite Element Modeling for Fracture Mechanics Analyses." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1623240613376967.

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14

Cajuhi, Tuanny Verfasser], Lorenzis Laura [Akademischer Betreuer] De, and Pietro [Akademischer Betreuer] [Lura. "Fracture in porous media : phase-field modeling, simulation and experimental validation / Tuanny Cajuhi ; Laura De Lorenzis, Pietro Lura." Braunschweig : Technische Universität Braunschweig, 2019. http://d-nb.info/1180601521/34.

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15

Sridhar, Ashish [Verfasser], and Marc-André [Akademischer Betreuer] Keip. "Phase-field modeling of microstructure and fracture evolution in magneto-electro-mechanics / Ashish Sridhar ; Betreuer: Marc-André Keip." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2020. http://d-nb.info/1232727903/34.

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16

Nigro, Claudio F. "Phase field modeling of flaw-induced hydride precipitation kinetics in metals." Licentiate thesis, Malmö högskola, Institutionen för materialvetenskap och tillämpad matematik (MTM), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-7787.

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Hydrogen embrittlement can manifest itself as hydride formation in structures when in contact with hydrogen-rich environments, e.g. in space and nuclear power applications. To supplant experimentation, modeling of such phenomena is beneficial to make life prediction reduce cost and increase the understanding. In the present work, two different approaches based on phase field theory are employed to study the precipitation kinetics of a second phase in a metal, with a special focus on the application of hydride formation in hexagonal close-packed metals. For both presented models, a single compo

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17

Gavagnin, Claudio. "Modeling and computation of cracking in multiphase porous media with the phase-field approach." Doctoral thesis, Università degli studi di Padova, 2019. http://hdl.handle.net/11577/3427308.

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The development of mathematical and numerical models for the study of the problem of fracture in porous media is motivated by several real-world applications. In particular, the phase-field approach to fracture, based on the regularization of the variational formulation of the Griffith's theory, seems to be one of the most promising, due to its ability to model complicated fracture processes, such as nucleation and branching, and preserve the continuity of the displacement field. The majority of the phase-field models for fracture in porous media present in the literature are mainly oriented t

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18

Aldakheel, Fadi [Verfasser], and Christian [Akademischer Betreuer] Miehe. "Mechanics of nonlocal dissipative solids : gradient plasticity and phase field modeling of ductile fracture / Fadi Aldakheel ; Betreuer: Christian Miehe." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2016. http://d-nb.info/1118370228/34.

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19

Schwaab, Marie-Émeline. "Growth of interacting cracks : numerical approach to "En-passant" fracture." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1276/document.

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La rupture macroscopique d’un matériau intervient généralement lorsque des micro-défauts coalescent, plutôt que par la propagation catastrophique d’une seule fissure. Il est donc souhaitable d’étudier des configurations de rupture où de multiples fissures interagissent. Les paires de fissures en-passant (EP), où deux fissures parallèles croissent l’une vers l’autre, sont particulièrement intéressantes d’un point de vue applicatif. Cette configuration de rupture se retrouve aussi bien dans des situations naturelles (os, dorsales océaniques,…) qu’industrielles (génie civil, pièces métalliques,…)

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20

Li, Tianyi. "Gradient-damage modeling of dynamic brittle fracture : variational principles and numerical simulations." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLX042/document.

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Une bonne tenue mécanique des structures du génie civil en béton armé sous chargements dynamiques sévères est primordiale pour la sécurité et nécessite une évaluation précise de leur comportement en présence de propagation dynamique de fissures. Dans ce travail, on se focalise sur la modélisation constitutive du béton assimilé à un matériau élastique-fragile endommageable. La localisation des déformations sera régie par un modèle d'endommagement à gradient où un champ scalaire réalise une description régularisée des phénomènes de rupture dynamique. La contribution de cette étude est à la fois

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21

Zhai, Xinyuan. "Crack propagation in elastic media with anisotropic fracture toughness : experiments and numerical modeling." Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAE010.

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La fabrication additive attire une attention croissante en raison de ses avantages en termes de flexibilité de modélisation et de facilité de conception de microstructures complexes. Nous avons constaté qu'en manipulant la stratégie d'impression, les échantillons imprimés par dépôt de fusion de polycarbonate peuvent présenter un comportement fortement anisotrope en termes de résistance à la rupture, tout en conservant des propriétés isotropes en termes d'élasticité.Le focus de cette thèse est d'explorer le comportement en matière de rupture dans des milieux élastiques isotropes présentant une

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22

Schänzel, Lisa-Marie [Verfasser], and Christian [Akademischer Betreuer] Miehe. "Phase field modeling of fracture in rubbery and glassy polymers at finite thermo-viscoelastic deformations / Lisa-Marie Schänzel. Betreuer: Christian Miehe." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2015. http://d-nb.info/1069107409/34.

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23

Wu, Chi. "Time-dependent Topology Optimisation for Implantable Devices." Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/29237.

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Implantable load-bearing devices signify a class of major biomechanical devices that replace damaged organs/tissue to restore desired functionalities. So far, implant designs often follow trial-and-error or experience-based protocols rather than patient-specific designs. In addition, in-vivo studies have demonstrated that implant design can substantially determine long-term treatment outcomes and longevity. Therefore, rather than empirical guidelines, efficient and elegant design approaches are urgently required to consider both initial conditions and time-dependent behaviours to promise an op

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24

Wu, Yi. "Topology optimization in structural dynamics : vibrations, fracture resistance and uncertainties." Thesis, Paris Est, 2022. http://www.theses.fr/2022PESC2007.

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L'objectif de cette thèse est de développer des méthodes d'optimisation topologiques basées sur la densité pour plusieurs problèmes difficiles de structure en dynamique. Premièrement, nous proposons une stratégie de normalisation en élasto-dynamique en vue d'obtenir une distribution optimale de matériau dans la structure qui réduit la réponse aux excitations dynamiques en fréquence et améliore la stabilité numérique dans la méthode BESO (bi-directional evolutionary structural optimisation). Ensuite, pour décrire les incertitudes de paramètres pouvant intervenir dans des problèmes réalistes en

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25

Goswami, Somdatta [Verfasser], Timon [Akademischer Betreuer] Rabczuk, Stephane [Gutachter] Bordas, and Magd Abel [Gutachter] Wahab. "Phase field modeling of fracture with isogeometric analysis and machine learning methods / Somdatta Goswami ; Gutachter: Stephane Bordas, Magd Abel Wahab ; Betreuer: Timon Rabczuk." Weimar : Bauhaus-Universität Weimar, 2021. http://d-nb.info/122878924X/34.

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26

Chafia, Zakaria. "Numerical multiscale strategies and High Performance Computing for predicting the fracture behaviour of heterogeneous materials." Electronic Thesis or Diss., Université Gustave Eiffel, 2024. http://www.theses.fr/2024UEFL2069.

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L'objectif de cette thèse est de développer des méthodes numériques pour simuler la fissuration et le comportement à la rupture des structures hétérogènes quasi-fragiles. L'intégration des matériaux composites dans ces structures rend leur comportement fortement dépendant de la microstructure, et pouvant ainsi induire une anisotropie à l'échelle macroscopique. Pour capturer les effets d'échelle au niveau du comportement endommageable des structures hétérogènes, les simulations doivent être réalisées avec une description fine et détaillée de la microstructure. Dans un premier temps, une impléme

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27

Msekh, Mohammed Abdulrazzak Verfasser], Timon [Akademischer Betreuer] Rabczuk, Lorenzis Laura [Gutachter] De, and Tom [Gutachter] [Lahmer. "Phase Field Modeling for Fracture with Applications to Homogeneous and Heterogeneous Materials / Mohammed Abdulrazzak Msekh ; Gutachter: Laura De Lorenzis, Tom Lahmer ; Betreuer: Timon Rabczuk." Weimar : Bauhaus-Universität Weimar, 2017. http://d-nb.info/1135592950/34.

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28

Msekh, Mohammed Abdulrazzak Verfasser], Timon [Akademischer Betreuer] [Rabczuk, Lorenzis Laura Gutachter] De, and Tom [Gutachter] [Lahmer. "Phase Field Modeling for Fracture with Applications to Homogeneous and Heterogeneous Materials / Mohammed Abdulrazzak Msekh ; Gutachter: Laura De Lorenzis, Tom Lahmer ; Betreuer: Timon Rabczuk." Weimar : Bauhaus-Universität Weimar, 2017. http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170615-32291.

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29

Kramer, Sharlotte Lorraine Bolyard Ravichandran G. (Guruswami) Ravichandran G. (Guruswami) Bhattacharya Kaushik. "Phase-shifting full-field interferometric methods for in-plane tensorial stress determination for fracture studies /cSharlotte Lorraine Bolyard Kramer ; Guruswami Ravichandran, committee chair and advisor ; Kaushik Bhattacharya, co-advisor." Diss., Pasadena, Calif. : California Institute of Technology, 2009. http://resolver.caltech.edu/CaltechETD:etd-05272009-094456.

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30

Quintanas, Corominas Adrià. "Towards a high-performance computing finite element simulation framework for virtual testing of composite structures." Doctoral thesis, Universitat de Girona, 2019. http://hdl.handle.net/10803/669323.

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his doctoral thesis aims at developing and implementing a computational framework for performing virtual testing of composite structures using a High-Performance Computing (HPC) environment. In this sense, this thesis presents several novel constitutive models based on the continuum damage mechanics theory and their implementation in the HPC-base Finite Element (FE) simulation code called Alya. The verification and validation of the models are performed comparing the numerical predictions with analytical formulations and experimental data. The comparisons demonstrate not only the reliability o

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31

Riad, Soukaina. "Vers une modélisation de la corrosion sous contrainte assistée par l'irradiation du superalliage 718." Electronic Thesis or Diss., Ecole centrale de Nantes, 2022. http://www.theses.fr/2022ECDN0039.

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Le superalliage base nickel 718 est réputé pour présenter une excellente tenue à la corrosion, une très forte résistancemécanique et une bonne tenue sous irradiation. De ce fait, il s’agit d’un matériau de choix au sein d’un réacteur électronucléaire pour les pièces soumises à des sollicitations extrêmes (ressorts, systèmes de maintien. . . ).Pourtant des ruptures en service ont été observées de ce matériau sous le phénomène de corrosion sous contraintes assistée par l’irradiation. La présente thèse vise à apporter de nouveaux éléments de compréhension de ce phénomène complexe sous l’angle de

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32

Staudinger, Ulrike. "Morphologie und Bruchverhalten von Block- und Multipfropfcopolymeren." Doctoral thesis, [S.l. : s.n.], 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1187261828675-34703.

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33

Cheng, Zifeng. "Modelling Brittle Fractures with Finite Elements: A Time-independent Phase-field Model." Thesis, Faculty of Engineering, School of Civil Engineering, 2020. https://hdl.handle.net/2123/29350.

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The objective of this paper is to propose a 2-D time-independent phase-field model with validating its performance as well as applying it for simulating existing representative experiments. Firstly, the section of the literature review provides an overview of quasi-brittle material and brittle fracture behaviours, as well as the existing FE models from both discontinuous and continuous approaches for simulating fracture behaviours. Next, the governing equations of the proposed phase-field model are determined, which are based on traditional Griffith’s theory as well as a specific variational m

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34

Noel, Matthieu. "Modélisation déterministe et probabiliste de la rupture par champ de phase et identification expérimentale pour la fissuration des structures en bois dans l’ameublement." Electronic Thesis or Diss., Université Gustave Eiffel, 2024. http://www.theses.fr/2024UEFL2061.

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Dans le domaine de l'ameublement, garantir la sécurité des structures conformément aux normes européennes représente un enjeu important pour les fabricants de meubles. Avant leur commercialisation, les meubles sont soumis à des tests de validation normalisés, qui ne permettent de connaître leur comportement mécanique qu'a posteriori. Cette thèse vise à développer des outils de modélisation et de simulation numérique pour prédire la rupture par fissuration au niveau des connexions entre les éléments de meuble. Pour atteindre cet objectif, l'approche méthodologique combine la modélisation et la

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35

Sommer, Liesel [Verfasser], and Christian [Akademischer Betreuer] Engwer. "An unfitted discontinuous Galerkin scheme for a phase-field approximation of pressurized fractures / Liesel Sommer ; Betreuer: Christian Engwer." Münster : Universitäts- und Landesbibliothek Münster, 2019. http://d-nb.info/1201729483/34.

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Borden, Michael Johns. "Isogeometric analysis of phase-field models for dynamic brittle and ductile fracture." Thesis, 2012. http://hdl.handle.net/2152/ETD-UT-2012-08-6113.

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To date, efforts to model fracture and crack propagation have focused on two broad approaches: discrete and continuum damage descriptions. The discrete approach incorporates a discontinuity into the displacement field that must be tracked and updated. Examples of this approach include XFEM, element deletion, and cohesive zone models. The continuum damage, or smeared crack, approach incorporates a damage parameter into the model that controls the strength of the material. An advantage of this approach is that it does not require interface tracking since the damage parameter varies continuou

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(9312344), Xiaorong Cai. "PHASE FIELD MODELING OF MICROSTRUCTURE EVOLUTION IN CRYSTALLINE MATERIALS." Thesis, 2020.

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<div> <div> <div> <p>The material responses and the deformation pattern of crystals are strongly influ- enced by their microstructure, crystallographic texture and the presence of defects of various types. </p> <p>In electronics, Sn coatings are widely used in circuits to protect conductors, reduce oxidation and improve solderability. However, the spontaneous growth of whiskers in Sn films causes severe system failures. Based on extensive experimental results, whiskers are observed to grow from surface grains with shallow grain boundaries. The underlying mechanism for these surface grains form

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Kramer, Sharlotte Lorraine Bolyard. "Phase-Shifting Full-Field Interferometric Methods for In-Plane Tensorial Stress Determination for Fracture Studies." Thesis, 2009. https://thesis.library.caltech.edu/2176/3/02A_chap2.pdf.

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<p>Anisotropic fracture criteria can be established with understanding of full-field stresses near a crack. The anisotropy of the stresses implies that the full in-plane tensorial stress is required, but current experimental optical techniques only give the sum or difference of principal stresses, motivating development of experimental methods that combines two experimental techniques to determine all of the stress components, such as the proposed hybrid experimental method of phase-shifting photoelasticity and transmission Coherent Gradient Sensing (CGS). This thesis establishes this method

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39

Arriaga, e. Cunha Miguel Torre do Vale. "Stability Analysis of Metals Capturing Brittle and Ductile Fracture through a Phase Field Method and Shear Band Localization." Thesis, 2016. https://doi.org/10.7916/D8RX9HPR.

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Dynamic fracture of metals is a fascinating multiphysics-multiscale problem that often results in brittle and/or ductile fracture of structural components. Additionally, under high strain rates such as impact or blast loads, a failure phenomena known as shear banding may also occur, which is a common precursor to fracture. Both fracture and shear banding are instability processes leading to strong discontinuities and strain localization, respectively. Namely, shear bands are zones of highly localized plastic deformation, while brittle/ductile cracks are material discontinuitie

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Carka, Dorinamaria. "Non-Linear Analysis of Ferroelastic/Ferroelectric Materials." 2012. http://hdl.handle.net/2152/19499.

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Abstract Ferroelectric/ferroelastic ceramics are used in a range of smart structure applications, such as actuators and sensors due to their electromechanical coupling properties. However, their inherent brittleness makes them susceptible to cracking and understanding their fracture is of prominent importance. A numerical study for a stationary, plane strain crack in a ferroelastic material is performed as part of this work. The stress and strain fields are analyzed using a constitutive law that accounts for the strain saturation, asymmetry in tension versus compression, Bauschinger effects,

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41

Dhas, Bensingh P. "On a Few Non-Classical Perspectives in Solid Mechanics." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5076.

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Postulates in solid mechanics can be broadly classified into three groups describing the geometry of a configuration, mechanical equilibrium and thermodynamics of the deformation process. The geometry defined on a configuration provides us with tools to analyse deformation. The strain tensor in three dimensional elasticity and the curvature tensor encountered in a Kirchhoff type shell theory are consequences of the geometric hypotheses. The first part of this thesis (Chapters 2-4 to wit) uses a class of affine connections to study the deformation of elastic continua, shells and continua with

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42

Mondal, Anirban. "A non-classical continuum approach to study the fragmentation of brittle solids." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5930.

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In this thesis, a non-local continuum approach coupled with the phase-field theory and Jones-Wilkins-Lee (JWL) equation of state (EOS) is proposed to model and simulate blast-induced fracture in brittle materials. Also, we study the evolution of field variables in the underground explosion of steel fiber reinforced concrete (SFRC). For numerical implementation, we have used a non-ordinary state-based peridynamic theory coupled with a diffusive phase-field damage approach. Moreover, JWL EOS from the family of isentropes has been formed, and finally, the constitutive relations have been arrived

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