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Showing 1 to 20 of 137 for “"Phase Field"”.
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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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Phase-field Modeling of Phase Change Phenomena
The phase-field method has become a popular numerical tool for moving boundary problems in recent years. In this method, the interface is intrinsically diffuse and stores a mixing energy that is equivalent to surface tension. The major advantage of this method is its energy formulation which makes …
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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 simulation of solidification with moving solids
… fluid structure interactions coupled with the phase-field method while allowing for topology changes in the solid-liquid interface with non-stationary solids. This methodology is implemented using a finite difference scheme and a semi-implicit integration method. Pure translation and pure …
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A phase-field study of ternary multiphase microstructures
… with an arbitrary number of components and phases was developed from basic thermodynamic and kinetic principles and applied to the study of ternary eutectic phase transformations. Gradients in composition and phase were included in the free energy functional, and a generalized diffusion …
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Phase field modeling of the defect evolution and failure
… work.</p> <p>In the first part of the work, a phase field dislocation dynamics (PFDD) approach is introduced, which tracks the evolution of the dislocations in ultrafine and nano grained metals and takes into account the elastic interaction between dislocations, obstacles and the applied …
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Phase Field Crystal Approach to the Solidification of Ferromagnetic Materials
… of magnetic solids is investigated, using a field theoretical approach, called the Magnetic Phase Field Crystal model. We constructed the free energy by extending the Phase Field Crystal (PFC) formalism and including terms to incorporate the ferromagnetic phase transition and the anisotropic …
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Phase Field Modeling of Grain Growth in Porous Polycrystalline Solids
… This has motivated us to develop a novel phase field model to investigate the process of grain growth in porous polycrystalline solids. Based on a dynamical system of coupled Cahn-Hilliard and Allen-Cahn equations, the model couples the curvature-driven grain boundary motion and the …
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Coupled Gradient Enhanced Damage - Viscoplasticity Model Using Phase Field Method
… a framework to describe damage evolution as a phase transformation in solid materials and couple it to the well-known Perzyna type viscoplastic model to account for inelastic behavior of ductile materials. To accomplish this task, the following steps have been performed. First, a new nonlocal, …
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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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Computational Analysis of Asphalt Binder based on Phase Field Method
… issue for pavement engineers. Recently, the Phase Field Method (PFM) has emerged as a powerful computational tool to simulate the microstructure evolution of asphalt binder. PFM analyzes the structure from the free energy aspect and can provide a view of the whole microstructure evolution …
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Modelling of dynamic fracture by Phase Field and Finite Fracture Mechanics
L'abstract è presente nell'allegato / the abstract is in the attachment
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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 Oscillatory Wetting Phenomena with Contact Angle Hysteresis
… from quasi-static experiments. Here we use a phase-field model of dynamic wetting which directly includes the contact angle hysteresis to simulate the results of the aforementioned authors. A thorough derivation of the governing equations is presented, starting from the pioneering work of Cahn …
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Ternary Flow Simulation Based on The Conservative Phase Field Lattice Boltzmann Method
… this thesis, we numerically investigated multi-phase fluid dynamics (2 and 3-phase flow) by solving the Navier-Stokes equations coupled with the conservative phase field (CPF) equations using the Lattice Boltzmann method (LBM). To effectively simulate the large-scale multi-phase physics, we …
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A phase field study of compositional patterning in irradiated binary immiscible alloys
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-04-06 without embargo terms
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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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Multiscale phase-field approach to martensitic phase transformations that satisfies lattice instability conditions
<p>An advanced phase-field approach to martensitic phase transformations (PTs) at finite strains are developed at nanoscale that satisfies crystal lattice instability conditions obtained by atomistic simulations. Theory includes a fully geometrically nonlinear formulation for the general case of …
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Phase-field modeling of fracture: regularization length insensitivity and mixed mode ductile fracture
… Among computational fracture models, the phase-field modeling approach has emerged as a superior model to overcome the discontinuities associated with cracking. However, we identified a number of shortcomings with existing models, namely in the sensitivity of phase-field model predictions …
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Percolation behavior of diffusionally evolved two-phase systems simulated using phase field methods
… affects the properties of many multi-phase materials. As such, significant prior work has been done to investigate the percolation threshold and critical scaling exponents of randomly assembled composites. However many materials are non-random as a result of correlations that are …
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