Global ETD Search
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Showing 1 to 20 of 48 for “"phase-field model"”.
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Phase field model for precipitates in crystals
… and its morphological evolution by means of phase-field method, and to gain the insight of the morphological transition of the oxygen precipitate and the distribution of oxygen, vacancy, and self-interstitial around the single oxygen precipitate. The traditional approach to simulate …
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Micromechanical phase-field model and simulation of eutectic growth with misfit stresses
… this work, we aim to develop a micromechanical phase-field model to assess the eutectic solidification in alloys with coherent elastic misfit. First, we generalize an existing phase-field method of diffusion-limited two-phase growth [Phys. Rev. E, 70 (2004) 061604] to a model of free-volume …
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A phase field model for the gallium permeation of aluminum grain boundaries
… solid-liquid interfaces and solid-solid heterophase interfaces, are important features found in materials. Material properties such as fracture toughness, corrosion susceptibility and high temperature creep are influenced by grain boundary physics. The structure of grain boundaries affects …
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Phase field model to study the corrosion of structural alloys in the harsh environments
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-20 without embargo terms
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Phase-Field Model For Heterogeneous Biofilm-Solvent Interaction and 3-D Numerical Simulation by GPUs
… <p>In our binary (two components) model, we consider the bacteria and the EPS as one effective EPS network component and the solvent along with nutrient as another effective solvent component. We also extend our model to a quasi-ternary model, in which we model the bacteria and EPS …
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Capturing irradiation-enhanced corrosion of zircaloy-4 with a charge-based diffusion/drift phase field model
… evidence points to Fe depletion from secondary phase particles (SPPs) as the culprit in enhancing Zircaloy-4 corrosion rates in PWRs. These new findings have been incorporated in a mechanistic finite-element phase field model of Zircaloy-4 corrosion called HOGNOSE. It accounts for both …
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The influence of hydrodynamic flow on microstructure evolution during solidification
… convection effects into an existing quantitative phase-field model [Phys. Rev. E, 70 (2004) 061604] that is meant to simulate dendritic growth of a binary alloy. We apply it to investigate the solidification of a Fe-Mn alloy under external flows conditions. In addition, we present an extension of …
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Efficient phase field simulations of multiple crystal orientations
… which examine the potential of three different phase-field models for such systems. First, I expand an existing coupled phase-field/Monte Carlo approach [H. Assadi, A Phase-Field Model for Crystallization into Multiple Grain Structures, in Solidification and Crystallization (2004), ed. by D. …
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3-D Computational Investigation of Viscoelastic Biofilms using GPUs
… We propose a single-fluid multi-component phase field model of biofilms that captures this behavior, then use numerical simulations on GPUs to investigate the biofilm’s growth and its hydrodynamics properties.</p>
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On convection and stability of some welding and solidification processes
… have developed a two-dimensional, axisymmetric model which includes the Marangoni force on the free surface of a semi-infinite region of liquid steel when a point source of current and heat is incident on the free surface. An asymptotic solution to this problem is obtained in this thesis, and …
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Quantitative phase-field modeling of crack propagation in multi-phase materials
… capable of designing micro-architectures of phases to improve fracture toughness and damage tolerance of ZrB<sub>2</sub>-based ultra-high temperature ceramics (UHTCs). A quantitative phase-field model based on the regularized formulation of Griffith’s theory is presented for crack propagation …
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Phase Field Modeling of Grain Growth in Porous Polycrystalline Solids
… and grain sizes and distributions. Theoretical models for the pore-grain boundary interactions during grain growth usually employ restrictive, unrealistic assumptions on the pore and grain shapes and motions to render the problem tractable. However, these assumptions limit the models to be only …
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Phase field modeling of dynamic brittle fracture at finite strains
… 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 …
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Ein Multi-Phasen-Feld-Modell für facettiertes Kristallwachstum
… from the melt is investigated using a Multi-Phase-Field Model. The model incorporates static anisotropy of interfacial energy and dynamic anisotropy of interface mobility. Its unique feature is the handling of triple junctions between crystals of different orientations and the melt. In the …
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Hierarchical multiscale modeling of Ni-base superalloys
… to 5-30 μm grains, hierarchical multiscale modeling is essential to address behavior at the component level. The goal of this work is to develop a framework for hierarchical multiscale modeling network that features linkage of several fine scale models to incorporate relevant microstructure …
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Thermodynamically consistent modelling and computational methods for multiphase flows
… research of my PhD, which is the study of two-phase flows by using the phase-field methods. The key point for this work is the thermodynamic con- sistency. We begin by introducing an extension of the Model H to study the two-phase flows with thermocapilliary effects, where we assume that the …
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Numerical modeling of interface dynamics and transport phenomena in transport-limited electrolysis processes
… to understand the effect of electrochemistry in phase boundary evolution in order to optimize the performance of such processes. This thesis contributes to predicting and controlling such interface instability phenomena by developing a computational model that captures them. Successful …
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Phase-field simulation of freezing water droplet
… we will introduce a quasi-compressible phase-field model that deals with this non-isothermal three-phase system involving water, ice, and air. The water-ice phase transition and the water-air fluid interface are handled by the Allen-Cahn and the Cahn-Hilliard equations, respectively. The …
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Phase-field modeling of fracture: regularization length insensitivity and mixed mode ductile fracture
… The development of quantitative computational models for predicting crack initiation and propagation has remained an important area of research because of the complexities that arise from topologically complex crack growth and interactions with other inelastic phenomena. Among computational …
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