弹粘塑性圆管中动应力集中的数值计算研究  

NUMERICAL ANALYSIS OF THE DYNAMIC STRESS CONCENTRATION IN ELASTIC/VISCOPLASTIC CIRCULAR TUBE

作　　者：刘凯欣[1] 董毓新[1] 

机构地区：[1]大连理工大学

出　　处：《爆炸与冲击》1990年第4期337-344,共8页Explosion and Shock Waves

基　　金：国家自然科学基金

摘　　要：本文采用沿次特征线积分方法,求解纵向冲击载荷作用下弹粘塑性圆管的动应力集中问题。数值计算结果表明:动应力集中的发生位置取决于圆管的壁厚与外环半径之比,圆管内各点最大拉应力中的极值依赖于冲击载荷的升载时间及圆管的材料特性。本文研究了避免发生动应力集中的条件,并同相对应的圆柱体的数值计算结果进行了比较。In this paper, the method of numerical integration along bicharacteristics is used to solve the problem of the dynamic stress concentration in the elastic/viscoplastic circular tube, when the longitudinal impact applied to the end face of the tube. By obtaining the numerical results, it is clearly demonstrated that, the positions of the dynamic stress concentration is dependent on the ratio of the thickness of the tube to the outside radius.the extreme value of the maximum tensile stresses in the tube is dependent on the rise time of the applied impact and nature of materials of the tube. The conditines to avoid occurrence of the dynamic stress concentration arc investigated. The numerical results are compared with related numerical results of circular cylinder.

关 键 词：管 动应力集中 数值解析 粘弹塑性 

分 类 号：O345[理学—固体力学]