A phase field model to simulate crack initiation from pitting site in isotropic and anisotropic elastoplastic material

A multiphysics phase field framework for coupled electrochemical and elastoplastic behaviors is presented, where the evolution of complex solid-electrolyte is described by the variation of the phase field variable with time. The solid-electrolyte interface kinetics nonlinearly depends on the thermodynamic driving force and can be accelerated by mechanical straining according to the film rupture-dissolution mechanism. A number of examples in two- and three- dimensions are demonstrated based on the finite element-based MOOSE framework. The model successfully captures the pit-to-crack transition under simultaneous electrochemical and mechanical effects. The crack initiation and growth has been demonstrated to depend on a variety of materials properties. The coupled corrosion and crystal plasticity framework also predict the crack initiation away from the perpendicular to the loading direction.

提出了一种用于耦合电化学和弹塑性行为的多物理场相场框架，其中复杂的固体 - 电解质的演化通过相场变量随时间的变化来描述。固体 - 电解质界面动力学非线性地取决于热力学驱动力，并且根据膜破裂 - 溶解机制，可通过机械应变加速。基于有限元的MOOSE框架展示了多个二维和三维的例子。该模型成功地捕捉了在电化学和机械效应同时作用下的蚀坑到裂纹的转变。已证明裂纹的萌生和扩展取决于多种材料特性。耦合的腐蚀和晶体塑性框架还预测了裂纹在偏离加载方向垂直方向处萌生。