摘要
运用Ｐｅｒｚｙｎａ的粘塑性过应力本构模型，分析了延性材料动态破碎的细观机理，给出了破碎尺寸与材料孔隙度的关系．此外，研究了初始损伤度对材料动态破碎的影响．结果表明，在初始损伤较小时，破碎尺寸随孔隙度增加而减小；而当初始损伤较大时，破碎尺寸随孔隙度增加而增大．这反映出材料的动态破碎是一个时间相关过程或累积过程．
A viscoplastic constitutive equation proposed by Perzyna was employed toinvestigate the mesomechanism of dynamic fragmentation of ductile materials. The fragment she versus material porosity was provided and the influence of initial damage ondynamic fragmentation was studied. The resultS showed that the fragment size had anincreasing trend with the groWth of material porosity as the initial damage was over acertain value, otherwise, the fragment size decreased with the growth of materialporosity. These verified that the dynamic fragmentation of ductile materials was atime--duration --dependent process or namely accumulative process.
出处
《材料科学与工艺》
CAS
CSCD
北大核心
1994年第1期33-38,共6页
Materials Science and Technology
关键词
初始损伤效应
动态破碎
延性材料
ductile material
dynamic fragmentation
initial damage
viscoplasticity
time-duration-dependent process
