计算力学学报Issue(4)：565-569,5.DOI:10.7511/jslx201304019
应力诱发表面扩散下晶内微裂纹演化的有限元分析
A finite element analysis of the evolution of intragranular microcracks due to surface diffusion induced by stress migration
摘要
Abstract
Based on the classical theory of surface diffusion and evaporation-condensation ,a finite element program is developed for simulating the shape instability of intragranular microcracks due to surface dif-fusion induced by stress migration .The results show that there exists a critical value of aspect ratio βc for the intragranular microcracks under the compressive and tensile stress .When β<βc ,the microcrack will directly evolve into a cylinder .Whenβ≥βc ,it will split into three small microcracks .The splitting time of microcrack decreases linearly with the aspect ratio increasing .As the stress increases ,both the critical value of aspect ratio and the splitting time increase continuously .关键词
微裂纹演化/表面扩散/应力迁移/有限单元法Key words
microcrack evolution/surface diffusion/stress migration/finite element method分类
数理科学引用本文复制引用
张周周,黄佩珍..应力诱发表面扩散下晶内微裂纹演化的有限元分析[J].计算力学学报,2013,(4):565-569,5.基金项目
国家自然科学基金（10702028）；江苏高校优势学科建设工程资助项目． （）
