摘要
采用Lee-Tarver点火增长模型对单钨珠撞击带壳B炸药的过程进行了计算,所得到的不同尺寸钨珠引爆炸药的阈值速度与实验结果吻合良好。数值模拟了双钨珠同时撞击带壳B炸药的过程,计算了破片引爆炸药的阈值速度,分析了炸药的点火增长过程。结果表明:双破片同时撞击炸药时,引爆阈值速度随着破片间距的增大呈抛物线规律增大;当破片间距较大且撞击速度略高于阈值速度、双破片同时撞击时,炸药内部爆轰波的初始形态随破片速度而变化。
The explosives initiation by simultaneous impact from two fragments was simulated based on Lee-Tarver ignition and growth model by using finite element code LS-DYNA.In order to verify the simulation method and parameters,the courses that tungsten spheres with different diameters impacted tantalum covered Composition B charges were simulated,and the critical velocity to ignite Composition B was gained,which accorded well with the experimental results.The problems that two tungsten spheres with three kinds of diameters impacted Composition B charges were simulated.It can be found that the critical velocity to ignite explosives by two fragments,which was lower than one tungsten sphere condition,varied with the distance between the two fragments approximately in term of parabolic curve.When the impact velocity was equal to or slightly larger than the critical velocity,there can be different shapes of detonation wave appearing in the charge,including spherical,W-shape,V-shape,VW-shape and so on.
出处
《高压物理学报》
EI
CAS
CSCD
北大核心
2011年第5期469-474,共6页
Chinese Journal of High Pressure Physics
关键词
爆炸力学
冲击起爆
破片撞击
阈值速度
点火增长模型
mechanics of explosion
shock initiation
fragment impact
critical velocity
ignition and growth model
