高速冲击问题的SPH粒子接触算法三维数值计算

High Velocity Impact Simulation Using SPH Contact Algorithm

光滑粒子流体动力学方法模拟高速冲击问题时通常采用连续速度算法来计算子弹和靶板的接触,但当子弹和靶板分离时,该算法存在缺陷;为解决高速冲击中的接触问题,基于SPH粒子接触算法,分别对球头钢弹斜冲击钢板和平头钢弹正冲击钢板的过程进行了三维数值计算;通过在SPH粒子上施加接触力的方式计算子弹和靶板发生接触时的接触作用;将SPH粒子接触算法、LS-DYNA970算法、SPH连续速度算法的计算结果和实验结果进行了对比,表明SPH粒子接触算法能够适用于正冲击、斜冲击、复杂接触面的问题。

Contact is often treated with continuity velocity algorithm in Smoothed Particle Hydrodynamics（ SPH） for high velocity impact,which inevitably introduces inaccuracies into the calculation when simulating the separation between bullet and target. The SPH contact algorithm was employed to solve the contact in high velocity impact in this paper. Contact forces were enforced on SPH particles once contact occurs,and the identification of the contact surface and surface normal were not required. The oblique impact of target plate against hemispherical-nosed bullet and the normal impact of target plate against blunt-nosed bullet were simulated in 3 D with this SPH contact algorithm. The numerical simulation results of the SPH contact algorithm,LS-DYNA970,the continuity velocity algorithm and the experimental observations were compared,showing that the SPH contact algorithm can treat oblique impact,normal impact,and problems with complicated contact surface.