冲击波及气泡载荷联合作用下变截面加筋圆柱壳动态响应

Dynamic Response of a Stiffened Cylindrical Shell with a Variable Cross Section Subjected to Shock Wave and Bubble Load

以缩比无人水下航行器典型尾部变截面加筋圆柱壳结构为研究对象,应用LS-DYNA软件中ALE算法对水下爆炸冲击波及气泡载荷作用下变截面加筋圆柱壳结构的动态响应进行数值仿真计算。分析了变截面加筋圆柱壳在水下爆炸冲击波及气泡载荷作用下的动态响应,并进一步探讨了冲击因子和爆炸方位对结构损伤特性的影响。结果表明:随着冲击因子的增大,冲击波对变截面加筋圆柱壳结构的损伤逐渐增大,气泡载荷会进一步加大结构的凹陷变形及塑性区域;射流载荷随着冲击因子的增大先增大后减小,在特定冲击因子下射流载荷能够达到最大;冲击波对变截面加筋圆柱壳的损伤效果受方位影响很小,当药包位于变截面加筋圆柱壳正上方时,射流载荷最大,导致结构的最终损伤变形也最大。

Considering the typical tail of a scaled unmanned undersea vehicle,namely a stiffened cylindrical shell with a variable cross-section,as a research object,its dynamic responses to underwater explosion shock wave and bubble load are simulated using the ALE algorithm in LS-DYNA.The dynamic response of a stiffened cylindrical shell subjected to underwater explosion loads is analyzed and the effects of the impulse factor and explosion orientation on structural damage characteristics are discussed.The results indicate that the damage of shock wave to a stiffened cylindrical shell with a variable cross-section gradually increases with an increase in the impulve factor and that the bubble load further increases the concave deformation and plastic region of the shell.The jet load increases initially and then decreases with an increase in the impulse factor,meaning the jet load is maximized at a specific impulse factor.Explosion orientation has little effect on the damage of shock wave to a stiffened cylindrical shell with a variable cross-section.When the charge is directly above the stiffened cylindrical shell,the jet load is the greatest,resulting in the maximum final damage and deformation of the structure.