中低速长杆弹侵彻半无限岩石靶的动态响应研究

发布时间：2018-07-03 05:03

  本文选题：统一强度理论 + 侵彻　； 参考：《工程力学》2017年09期

【摘要】：该文将统一强度理论与岩石材料动力强度依赖应变率效应的物理模型相结合,建立了岩石材料在侵彻等动力荷载作用下的率型动态统一强度准则。基于修正的土盘浮动锁应变模型,考虑应变率效应、中间主应力效应、强度准则差异和弹头滑动摩擦的影响,推导了土盘整体平均锁应力和整体平均锁应变的表达式。采用MATLAB数值计算软件和四阶Runge-Kutta算法编制计算程序,求解了中低速(V≤900 m/s)长杆弹侵彻条件下弹体的侵彻深度,研究了侵彻过程中弹体的运动规律及靶体的动态响应,分析了各参数对弹体侵深的影响特性。研究表明:该文计算方法可以较好地描述整个侵彻过程中弹、靶的动态响应,还可以得到一系列基于不同强度准则的侵彻深度的解析解,有效地预测弹体侵深的上限值和下限值;中间主应力效应、强度准则差异和弹头滑动摩擦对岩石靶的抗侵彻性能具有重要影响。
[Abstract]:In this paper, the unified strength theory is combined with the physical model of dynamic strength dependent strain rate effect of rock material, and the dynamic unified strength criterion of rock material under the action of penetration and other dynamic loads is established. Based on the modified floating locking strain model of soil disk, considering the effects of strain rate effect, intermediate principal stress effect, difference of strength criterion and sliding friction of warhead, the expressions of global average locking stress and global average locking strain are derived. The numerical calculation software MATLAB and the fourth order Runge-Kutta algorithm are used to calculate the penetration depth of the projectile under the condition of medium and low velocity (V 鈮，

本文编号：2092506