延性材料的动态崩落研究  

STUDY ON DYNAMIC FRAGMENTATION OF DUCTILE MATERIALS

作　　者：陈增涛[1] 王铎[1] 

机构地区：[1]哈尔滨工业大学航天工程与力学系

出　　处：《爆炸与冲击》1995年第2期167-173,共7页Explosion and Shock Waves

基　　金：国家自然科学基金

摘　　要：采用Ｇｒａｄｙ发展的一种动态崩落的一般描述方法，考虑了Ｈｅｒｔｚｂｅｒｇ对崩落过程的塑性修正，借助于不同的基体材料的等效应力假定，给出了考虑粘性（应变率）效应的强冲击载荷下延性材料的动态崩落尺寸与孔隙度的定量关系。这对动态断裂的细观描述提供了一个新的途径。The general description of dynamic fragmentation developed by Grady[1] is used to predict the nominal fragment size of ductile materials under high-speed loading.In the derivation,the improvement account for the plastic work during fragmentation on the Grady's energy de-scription is intreduced.Four kinds of plastic equivalent stress with effects of viscosity and strain-hardening of materials are taken into consideration in the present work,The dynamic fragment di-ameter versus the material porosity is given. The work provides a new method of describing meso-scopically the dynamic fracture of materials.

关 键 词：延性材料 崩落 微孔 细观力学 材料力学 

分 类 号：TB301[一般工业技术—材料科学与工程]