粘塑性介质中球形孔洞的动态增长

 提出了一个新的粘塑性介质中球形孔洞在高加载率作用下的演化方程。方程中考虑了应变率、局部惯性和介质的硬化效应，并对这些影响进行了数值分析和讨论。数值分析结果表明：孔洞的增长对外加载率和应变率十分敏感，在高加载率条件下局部惯性效应对孔洞增长有着重要影响，随着加载率的增加，这种影响增大。另外，得到了使孔洞增长的临界应力值的表达式。

GROWTH OF SPHERICAL VOID IN VISCOPLASTIC MEDIUM UNDER TENSILE DYNAMIC LOADING

A new evolution equation of growth of spherical voids in viscoplastic medium un-der dynamic tensile loading is presented in this paper. In the evolution equation ,strain rate ,ocalinertial effects and work-hardening behaviour of the material are taken into account ,and the in-fluence of these effects on the growth of voids numerically analysed and discussed.The results of numerical analysis show that the growth of voids is highly sensitive to loading and strain rate .It isalso shown that local inertial effects pfay an important role in the process of the void growth un-der high loading ratea,and these effects become larger as loading rate increases.An expression of critical stress of the void growth is obtained.