弹、塑性弹丸冲击混凝土的滑移面算法及其损伤演化

将有限元方法与光滑粒子动力学方法相结合，编制了弹、塑性弹丸冲击混凝土的计算程序,其中给出具有人工动量输运功能的滑移面算法。计算表明，弹丸按弹、塑性计算与按刚体计算的侵彻过程不同；特别对于壳结构弹体，其冲击速度存在临界值。超过临界冲击速度，弹体将发生较大塑性变形和损伤破坏，而且弹丸侵彻深度不能再随冲击速度增加而有效地增加。弹体损伤区的内损伤演化率与冲击速度有关，当冲击速度增加时损伤演化加快。

Sliding surface algorithm and projectile damage evolving for elastic-plastic projectiles impacting concrete targets

The elastic-plastic code that can be used to analysize the process of the projectile impacting concrete target with high velocity has been prepared by combination of FEM with SPH algorithm.The sliding surface algorithm with artificial transportation of momentum is proposed.The computational examples show that the penetrating processes with the elastic-plastic projectile analysis are different from that with the rigid projectile analysis.There is a critical velocity especially for the shell warhead and if the impact velocity is over the critical value the warhead will be deformed and damaged seriously,and its penetrating depth can not increase effectively with the increment of the impact velocity.The computations also show that the rate of damage evolving in the damage area of the projectile is related to the impact velocity and it is picked up with the increment of the impact velocity.