裂纹动态扩展的边界元模拟  

Dynamic Crack Propagation by Boundary Element Method

作　　者：雷钧[1] 黄祎丰 杨庆生[1] 

机构地区：[1]北京工业大学机械工程与应用电子技术学院,北京100124

出　　处：《北京工业大学学报》2013年第6期806-810,共5页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(11002006);教育部博士点学科专项科研基金资助项目(20091103120002)

摘　　要：采用时域边界元法对动态载荷作用下材料中裂纹的快速扩展过程进行数值模拟.计算中,裂纹动态扩展方向根据最大周向应力准则确定,扩展瞬时速度基于二分法迭代确定.在每个扩展时间步,通过在运动裂尖添加新的裂纹单元来模拟裂纹扩展.算例与实验及数值结果进行对比,验证了该方法的准确性.A time-domain boundary element method was applied to simulate the fast crack propagating process under dynamic loading. The crack-growth direction was determined by the maximum circumferential stress criterion. The instantaneous crack-tip velocity was approached by a bisection technique. New elements of inconstant length were added to the moving crack-tip to simulate the crack propagation. The simulation was analyzed and compared to the corresponding experimental and numerical results.

关 键 词：时域边界元法 裂纹 动态扩展 二分法 

分 类 号：O346.1[理学—固体力学]