脉冲激光线源激发金属圆管中冯.密赛斯应力的研究  

Analysis of the Von Mises stress fields generated by a pulsed line-source laser in metal pipes

作　　者：何跃娟[1] 朱云[1] 刘慧娟[1] 

机构地区：[1]江南大学理学院,江苏无锡214122

出　　处：《激光杂志》2011年第5期38-38,41,共2页Laser Journal

摘　　要：在得到的温度场分布的基础上,用有限元结构分析法数值模拟了金属圆管中脉冲激光线源产生的主应力场情况,得到了铝管中不同时刻的冯.密赛斯应力场,给出了不同时刻冯,密赛斯应力随周向和法向的分布以及等值图分布情况。数值结果表明:在激光加载中心点处冯.密赛斯应力值最大,冯.密赛斯应力随周向和法向的变化情况和温度场的变化类似。Based on the laser- induced temperature fields, the transient thermal stress fields generated by a pulsed line - source laser in aluminum pipe are analyzed by using a finite element method. The Van Mises stress fields are obtained at various time. The normal and the circmnferential distributions of Von Mises stress are given at various time. And the isolines＇ distributions of Von Mises stress are shown. The numerical results denoted： the center of the laser irradiation range at the material surface has the biggest Von Mises stress. The distribution of Von Mises stress is similar to the temperature distribution.

关 键 词：激光热应力场 冯.密赛斯应力 主应力 有限元方法 

分 类 号：TN249[电子电信—物理电子学] O426[理学—声学]