摘要
基于两点起爆实验,采用动力学有限元程序,在不考虑圆管破裂的前提下,详细分析了同一炸药爆轰下金属圆管各材料力学参数对其运动的影响规律。计算结果表明:弹性模量越大,泊松比越大,金属圆管的膨胀速度越大,但它们对圆管膨胀的位移和速度影响极小,在工程中可以忽略;屈服应力对金属圆管的运动有一定影响,屈服应力越大,对碰部位的鼓包范围越宽,鼓包峰值越小,但圆管各处的膨胀量均落后于屈服应力较小的情况;密度对圆管运动有较大影响,密度越大,受鼓包影响范围越宽,鼓包峰高越小。
The effect under two detonation waves impacted in metallic tube is numerically simulated with a three-dimensional model. The simulation results of the deformation process, especially the contour of metallic tube impacting distribution are in good agreement with the pulsed X-ray photograph and the high-speed image. By ignoring the metallic tube rupture, the regular pattern of the transient motion effected by the parameters of the tube are analyzed. Simulation with different tube parameters shows that: (1) The effect of the growing of Young's modulus and Passion ratio ν on the tube expansion velosity is small, which is ignored in engineering application; (2) Yield stress affects the expansion velocity and the outer contours of metallic tube in certain degree, the height of the tube protuberance goes down with the yield stress growing; (3) the density affects velocity and outer contours of metallic tube seriously, the height of tube protuberance goes down with the density growing.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2004年第5期425-430,共6页
Explosion and Shock Waves
基金
中国工程物理研究院重点基金项目(1999Z0101)
关键词
爆炸力学
运动规律
有限元
金属圆管
爆轰波
mechanics of explosion
motion regular
FET(finite element)
metallic tube
detonation wave
