弹黏塑性材料稳恒扩展II型裂纹尖端应力场  

Tip Stress Field of Mode II Crowing Steadily in Elastic-Viscoplastic Materials

作　　者：王振清[1] 周博[1] 梁文彦 王纪滨 王永军 

机构地区：[1]哈尔滨工程大学航天工程系,黑龙江哈尔滨150001

出　　处：《航空学报》2006年第3期440-443,共4页Acta Aeronautica et Astronautica Sinica

基　　金：哈尔滨工程大学基础基金(002020260707)资助项目

摘　　要：采用弹黏塑性力学模型,对II型动态扩展裂纹尖端应力场的对数奇异性,进行了分析计算。详细地分析了黏性系数α、马赫数Ma2对裂纹尖端的应力场影响。指出了对数奇异性区域存在的问题,解释了过渡区的成因,对过渡区尖端场解的形式和求解方法做了合理的推测。An elastic viscoplastic constitutive mode is given in this paper. Based on it, the numerical computation of lnR/r singular in the mode II dynamic crack＇s tip field is carried out. The relationships between stress field distribution and viscosity coefficients and mach numbers are given. The problem existed in In（R/r） singular zone is given. The cause of the transitional zone is given. The form of stress field in the transitional zone and it＇s solving method are guessed rationally.

关 键 词：弹黏塑性材料 黏性系数 马赫数 动态扩展 仿真分析 

分 类 号：V215.6[航空宇航科学与技术—航空宇航推进理论与工程] O346.12[理学—固体力学]