摘要
本文借鉴Johnson的基本方法,采用高应变率下的应力应变关系,以一个球形实体中含有球形空穴为基本力学单元,通过分析基元的受力状况,采用奇异摄动方法,推导出了空穴膨胀比α的演化方程。方程中考虑了材料的硬化和应变率效应,同时又计及了惯性效应,在考虑空穴成校对损伤的影响时,采用了Chu和Needleman的结果,利用本文提出的模型对两个一维高速碰撞实验进行了数值模拟,计算结果与实验吻合较好。
In this paper a dynamic fracture model in ductile solids under the loading of a mean tensile stress is developed. The proposed model considers the void nucleation and growth as a part of the failure process. In the evolution of the distention a,work-hardening, rate -dependent contribution and inertial effects are involved. Meanwhile,a plate impact test was performed for the demonstration of the spallation process. The failure model is incorporated with a hydrody-namic computer code. The agreement between the computed and the experimental results is obtained.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
1992年第2期136-144,共9页
Explosion and Shock Waves
基金
高等学校博士学科点专项科研基金
关键词
断裂
延性动态损伤
损伤演化方程
dynamic ductile fracture, evolution of distention a,inertial effects, numerical simulation
