摘要
提出一种简化的塑性失稳处理并被作为高应变率拉伸下材料破坏的粗估判据。这种准则假设局部化失稳在如下条件下发生：应变及应变率硬化率恰被几何及热软化率平衡。指出了经验本构方程及本征本构方程对膨胀断裂应变的影响。通过算例也说明了热软化壳体在内压作用下的破裂过程。
Assuming that localized instability occurs when the current rate of strain and strain rate hardening is balanced by the rate of geometric and thermal softening,a simplified treatment of the plastic instability is presented and used as a criterion for the rough prediction of material failure under high strain rate stretching.The influence of the empirical and intrinsic constitutive equations on rupture strain of expanding rings is indicated.The rupture process of thermally softened shell stretched by internal pressure is explained with a calculated example.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
1999年第3期193-198,共6页
Explosion and Shock Waves
基金
国家863计划强辐射实验室科学基金
国家863高技术410-5专题组资助
关键词
破裂判据
膨胀环
高应变率
热软化
rupture criterion,expanding ring,high strain rate,thermal softening
