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Showing 1 to 20 of 148 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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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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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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Free-boundary problem of crack dynamics: phase field modeling
… transport theory. By proper use of the phase-field concept, we are now able to tackle the fully time-dependent free moving boundary problem to describe crack propagation in a fully self-consistent way. We concentrate on two material transport processes, namely surface diffusion and phase …
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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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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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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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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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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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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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