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.
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.
出处
《固体力学学报》
CAS
CSCD
北大核心
1992年第3期235-243,共9页
Chinese Journal of Solid Mechanics
基金
国家基金委青年科学基金
关键词
界面裂纹
奇异性
动态特性
interface crack
singularity
dynamic behavior
