摘要
本文采用动态微孔生长的Ｃ－Ｈ－Ｊ模型分析了孔隙材料动态损伤的细观机理．利用Ｇｒａｄｙ对动态破碎的能量描述给出了延性动态破碎的细观解释．此外，本文考察了应变率效应及应变强化效应（加工硬化）对动态延性损伤的影响，数值结果表明，应变强化与应变率效应相比其影响可忽略不计．
The C-H-J model for dynamic growth of microvoids is employed to analyse the mesomechanism of dynamic damage in porous media. The mesoexplanation for dynamic fragmentation is also obtained by using Grady's energy description. Moreover, the effects of strain hardening and strain rate on the dynamic ductile damage are numerically investigated. The result shows that the effect of strain hardening plays a neglectable role in the dynamic ductile damage in comparison with that of the strain rate.
出处
《固体力学学报》
CAS
CSCD
北大核心
1994年第4期365-370,共6页
Chinese Journal of Solid Mechanics
关键词
孔隙材料
动态损伤
破碎
细观机理
porous medium
dynamic damage
fragmentation
mesomechanism
