预制破片对厚壁圆管的横向高速冲击作用研究

Lateral high-velocity impact action of prefabricate fragments on a thick-walled tube

为了获得厚壁圆管在横向高速冲击下的响应规律,进行了预制破片冲击圆管试验,得到不同冲击速度作用下圆管的响应模态及侵彻深度,并采用LS-DYNA对整个动态变化过程进行了仿真研究,获得了侵彻过程中预制破片的速度变化规律及圆管壁厚和预制破片长径比对极限穿透速度的影响规律。结果表明侵彻深度与冲击速度线性相关;圆管壁厚在7 mm^8 mm之间时对圆管极限穿透速度影响最大;预制破片长径比低于1.5时,对圆管极限穿透速度有显著影响,但其影响效果随自身的增大而逐渐削弱,当达到3.5左右时极限穿透速度不再变化。

To get the response law of a thick-walled tube under lateral high velocity impact,tests for prefabricate fragments impacting a circular tube were conducted. The tube＇s response modes and penetration depths were obtained under different impact velocities. The whole dynamic process was simulated with LS-DYNA. The velocity change law of prefabricate fragments and the effect laws of wall thickness of tube and length-diameter ratio of fragment on the ultimate penetration velocity were obtained. The results indicated that there is a significant linear correlation between penetration depth and impact velocity; the effect of the wall thickness of 7-8 mm on the tube＇s ultimate penetration velocity is the maximum; the effect of the prefabricate fragment＇s length-diameter ratio less than 1. 5 on the tube＇s ultimate penetration velocity is obvious,but its effect gradually decreases with increase in itself; when it reaches 3. 5,the ultimate penetration velocity dose not change.