2篇
您的检索式：作者名="Shiva Rudraraju"
|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | PRISMS-PF:A general framework for phase-field modeling with a matrix-free finite element method显示文摘A new phase-field modeling framework with an emphasis on performance,flexibility,and ease of use is presented.Foremost among the strategies employed to fulfill these objectives are the use of a matrix-free finite element method and a modular,application-centric code structure.This approach is implemented in the new open-source PRISMS-PF framework.Its performance is enabled by the combination of a matrix-free variant of the finite element method with adaptive mesh refinement,explicit time integration,and multilevel parallelism.Benchmark testing with a particle growth problem shows PRISMS-PF with adaptive mesh refinement and higher-order elements to be up to 12 times faster than a finite difference code employing a second-order-accurate spatial discretization and first-order-accurate explicit time integration. | Stephen DeWitt Shiva Rudraraju David Montiel W.Beck Andrews Katsuyo Thornton | 2020 | npj Computational Materials2020，，1： | 2 |
| 2 | Mechanochemical spinodal decomposition: a phenomenological theory of phase transformations in multi-component, crystalline solids显示文摘We present a phenomenological treatment of diffusion-driven martensitic phase transformations in multi-component crystalline solids that arise from non-convex free energies in mechanical and chemical variables.The treatment describes diffusional phase transformations that are accompanied by symmetry-breaking structural changes of the crystal unit cell and reveals the importance of a mechanochemical spinodal,defined as the region in strain–composition space,where the free-energy density function is non-convex.The approach is relevant to phase transformations wherein the structural order parameters can be expressed as linear combinations of strains relative to a high-symmetry reference crystal.The governing equations describing mechanochemical spinodal decomposition are variationally derived from a free-energy density function that accounts for interfacial energy via gradients of the rapidly varying strain and composition fields.A robust computational framework for treating the coupled,higher-order diffusion and nonlinear strain gradient elasticity problems is presented.Because the local strains in an inhomogeneous,transforming microstructure can be finite,the elasticity problem must account for geometric nonlinearity.An evaluation of available experimental phase diagrams and first-principles free energies suggests that mechanochemical spinodal decomposition should occur in metal hydrides such as ZrH_(2−2c).The rich physics that ensues is explored in several numerical examples in two and three dimensions,and the relevance of the mechanism is discussed in the context of important electrode materials for Li-ion batteries and high-temperature ceramics. | Shiva Rudraraju Anton Van der Ven Krishna Garikipati | 2016 | npj Computational Materials2016，，1： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员