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界面裂纹尖端的动态奇异特性
引用本文:王晓东,邹振祝.界面裂纹尖端的动态奇异特性[J].固体力学学报,1992,13(3):235-243.
作者姓名:王晓东  邹振祝
作者单位:北京大学 100871 (王晓东),哈尔滨工业大学 150006 (邹振祝),哈尔滨工业大学 150006(王铎)
基金项目:国家基金委青年科学基金
摘    要:本文研究了界面裂纹尖端的动态应力场的奇异特性.引入尖端无摩擦接触的界面裂纹模型并采用具有运动边界的控制积分方程.证明了在动态界面裂纹尖端仅存在平方根奇异的应力场.数值结果表明接触区中的正应力确保持为压应力.为表现界面裂纹的动态特性,给出了应力强度因子和裂纹面接触区尺寸的数值结果.

关 键 词:界面裂纹  奇异性  动态特性

THE SINGULARITY BEHAVIOR OF AN INTERFACE CRACK UNDER DYNAMIC LOADS
Wang Xiaodong.THE SINGULARITY BEHAVIOR OF AN INTERFACE CRACK UNDER DYNAMIC LOADS[J].Acta Mechnica Solida Sinica,1992,13(3):235-243.
Authors:Wang Xiaodong
Abstract:The singularity behavior of the dynamic stress field of a crack lying on the interface of two differentmedium is investigated.By introducing a small region in which the crack faces make frictionless contactand making use of a kind of integral equations with moving boundaries,it is proved that there are onlysquare-root singularities near the tips of interface crack in case of that dynamic loads act on it.Numeri-cal results show that the normal stress in the contact region remains negative.The results of stress inten-sity factor and the length of crack face contact region are given to illustrate the dynamic behavior of theinterface crack.
Keywords:interface crack  singularity  dynamic behavior  
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