表面微空洞长大和相互作用的晶体有限元分析

通过建立空洞长大和相互作用的3D模型，采用晶体塑性有限元模拟研究了FCC晶体表面空洞的长大和相互作用行为，分析了晶体取向和微空洞在表面的深度变化对表面空洞长大和相互作用的影响。模拟结果表明：晶体取向除了影响空洞形状和长大方向外，还会影响空洞长大速度；总体而言，在固定位移边界条件下硬取向晶粒表面的空洞长大和相互作用大于软取向。随着空洞在单晶体表面深度的增加，空洞周围的最大塑性变形增加，变形局部化更加严重，空洞长大速度增加。

CPFEM ANALYSIS ON GROWTH AND INTERACTION BEHAVIORS OF SURFACE VOIDS

To investigate the growth and interaction behaviors of surface voids,unit cells containing surface voids were created.By using crystal plasticity finite element method(CPFEM),the effects of crystallographic orientation and depth of void location on voids growth and interaction were studied.Simulation results show that the void shape,growth direction and growth velocity significantly depend on the crystallographic orientation.In general,the growth velocity and interaction along the hard orientation are larger than that along the soft one under the strain controlled boundary condition.With the depth of surface void increasing,the maximal plastic deformation increases and deformation localization around voids is more serious;as a result,the velocity of void growth greatly accelerates.