偏心对称起爆战斗部破片初速的增益  

Fragments' velocity of eccentric warhead with double symmetric detonators

作　　者：王力[1] 韩峰[1] 陈放[1] 马晓青[1] 

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081

出　　处：《爆炸与冲击》2016年第1期69-74,共6页Explosion and Shock Waves

摘　　要：在极坐标下基于弹塑性基本方程建立了壳体膨胀的运动方程,且考虑了两点对称偏心起爆的碰撞效应,利用Whitham方法对两对称爆轰波的碰撞叠加进行了计算,得到了三波点的迹线、马赫波超压及马赫杆的高度等参数。通过联合求解,导出了马赫波区破片的初速计算公式,并利用AUTODYN软件进行了数值模拟,理论计算与数值模拟结果符合较好,验证了理论模型的可靠性。计算结果表明,两点对称偏心起爆时定向区破片初速增益超过30%,起爆点的夹角变化对破片的初速大小及飞散偏转影响并不明显。Eccentric warhead is a typical directional warhead,and its explosive wave is adjusted to improve the fragments＇ velocity in a specified area.The kinematic equation of a case was established in the polar coordinate system,and the Whitham method was adopted to realize the interaction of a double symmetric explosive wave,thus obtaining the trace of the triple wave point,the pressure and the height of the Mach stick,which were then calculated.By the combination of the kinematic equation and the Mach reflection,formula were deduced to evaluate the fragments＇ velocity in the Mach area.Comparison of the results obtained with AUTODYN 2Dsimulation shows that they are in good agreement.Double symmetric initiations increase the fragment＇s velocity by more than 30%,and the variation of the angle between initiations has little effect on the fragments＇ distribution and velocity.

关 键 词：爆炸力学 马赫效应 AUTODYN软件 偏心起爆 爆轰波 

分 类 号：O381[理学—流体力学]