横向爆炸载荷下开孔板的动应力集中因子

Stress concentration factor of a plate with hole subjected to transverse explosive loading

基于ANSYS5. 7 /LS DYNA程序,对3m×3m×0. 25m四边固支和简支、中心具有0. 3m×0. 3m方孔的开孔板和无孔板对应点在两种下三角爆炸载荷作用下的应力响应进行了分析;由开孔板和无孔板边对应点的主应力时程曲线,对提出的能量密度时间分布函数的绝对值平方进行变上限积分,按其比值确定动应力集中因子,该方法简单易行。

Using ANSYS 5.7/LS-DYNA, the dynamic stress concentration at the hole edge in a plate subjected to transverse explosive loading was studied. A simple and effective approach based on time-distributive function of energy density was developed to calculate the dynamic stress concentration factor. Numerical results are carried out for fixed supported and simple supported square plates (3 m × 3 m) with a hole (0.3 m × 0.3 m) in the center.