压剪应力作用下裂纹端部应力场的分析  

AN ANALYSIS OF STRESS FIELD AT CRACK ENDS UNDER A COMPRESSIONAL SHEAR STRESS

作　　者：王建华[1] 宋锦良[1] 冯德益[2] 蒋淳[2] 

机构地区：[1]天津大学 [2]天津市地震局

出　　处：《地震研究》1989年第2期125-136,共12页Journal of Seismological Research

基　　金：国家教委基金赞助的课题一部分。

摘　　要：按照压剪应力场中袭纹具有的特点,简化成三种力学模型——狭长缺口、顺序闭合裂纹及初始闭合裂纹。利用文中建议的局部分析法,对其端部应力场做的一般分析,导出了他们的普遍表达式。用光弹性实验及有限元计算对所得结果做的分析表明,它们是成立的。这些结果有助于了解构造地震震源的破裂机制及其应力场分布的某些特点。In the light of crack characteristics under a compressional shear stress, three different kinds of mechanical models (i.e. the narrow notch, gradual closing crack and initially closed crack) have been simplified. Furthermore, the stress fields at crack ends have been studied by the local analytic method suggested in this paper and their general expressions have been derived. An analysis of the obtained results by photoelastic experiments and finite clement computation show that the results in the paper are correct. Those results help us to understand the fracture mechanism of earthquake focus and some characteristics of its stress field distribution.

关 键 词：应力场 压剪应力 光弹性实验 

分 类 号：P315.2[天文地球—地震学]