基于Hopkinson压杆的延长冲击波脉冲升时的数值计算  

Numerical Calculation of Pulse Rise-time of Extensive Shock Wave in Hopkinson Pressure Bar

作　　者：叶婷[1] 邓琼[1] 

机构地区：[1]西北工业大学航空学院,陕西西安710072

出　　处：《兵工学报》2009年第S2期163-168,共6页Acta Armamentarii

基　　金：国家自然科学基金项目(10872174);陕西省自然科学基金(SJ08A07)

摘　　要：采用非线性动态有限元程序ANSYS/LS-DYNA和Hopkinson压杆的冲击脉宽计算公式,对锥形子弹冲击Hopkinson入射杆的脉宽进行了数值计算,并对冲击波的脉冲升时进行了分析。计算结果表明,锥形子弹与同长度、同半径的圆柱形子弹相比产生的脉冲宽度要大的多,铜质子弹与钢质子弹产生的脉宽相差无几;随子弹锥角的改变,子弹冲击产生的脉宽和脉冲升时有一个先增加后减小的趋势,但脉冲升时占整个脉冲的比例只有一个上升的趋势;锥形子弹半径的增加可以增加脉宽和脉冲升时,但两者比例变化不大。Using nonlinear dynamic finite element program ANSYS/LS-DYNA and the shock pulse width formula of Hopkinson pressure bar,the shock-wave width engendered by cone-shaped bullets incident upon the Hopkinson bar was calculated and the pulse rise-time was analyzed.The calculated results show that,compared to cylindrical bullets with the same length and radius,the conical bullets can engender much longer pulse width,and there is not much difference between the pulse widths caused by copper and steel bullets;with increase of the cone angle,the pulse width and rise-time generated by bullets increase first and then decrease,but the ratio of the rise-time in the total pulse increases only;for conical bullets,the increase of their radius can increase the pulse width and pulse rise-time,of which the ratio is constant almost.

关 键 词：HOPKINSON压杆 脉冲升时 ANSYS/LS-DYNA 锥形子弹 

分 类 号：O347.4[理学—固体力学]