模拟战斗部对混凝土侵彻与爆炸耦合作用的计算

利用SPH算法给出战斗部对混凝土先侵彻后爆炸的数值分析.在侵彻阶段弹体划分成Lagrangian标准有限元网格,而混凝土则划分成光滑粒子.在启动炸药爆轰计算前将弹体材料的有限元网格也转换成光滑粒子.给出了中止爆炸计算的准则.通过侵彻与爆炸耦合的二维计算给出了弹坑的最终体积和战斗部壳体膨胀速度的历史曲线及爆轰产物的压力过程曲线,其中最大压力与C-J爆轰压力一致,这说明本文算法是有效的.

COMPUTATIONS FOR COUPLED ACTIONS OF SIMULATED PROJECTILE PENETRATING AND DETONATING TO CONCRETE

Using SPH algorithm the numerical analysis of the projectile penetrating and subsequently detonating in a concrete was documented. In the penetrative stage the projectile was divided into standard Lagrangian finite elements, but the concrete was divided into SPH nodes. The finite elemental meshes of the projectile were converted into smooth particles before the calculation of the detonations. The criterion for stopping off the explosive computations was presented. Through the 2-D computations the final volume of the crater at the concrete target, the curve of pressure vs time of the explosive products, and the curve of expanding velocity vs time of the projectile shell were obtained. It is noted that the computational maximum pressure of the explosive products is consistent with the C-J explosive pressure.