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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。
In this paper, the unified strength theory is combined with the physical model that the dynamic strength of rock material depends on the strain rate effect, and the rate-dynamic unified strength criterion of rock material under penetration dynamic load is established. Based on the modified soil-plate floating-lock model, considering the effects of strain rate effect, intermediate principal stress effect, strength criterion difference and warhead sliding friction, the expressions of the average average latching stress and the overall average locking strain of soil plate are deduced. Computation program was calculated by MATLAB numerical calculation software and fourth-order Runge-Kutta algorithm, and the penetration depth of the projectile under mid-low speed (V≤900 m / s) penetration was calculated. And the dynamic response of the target, the influence of each parameter on the penetration of the projectile is analyzed. The results show that the proposed method can describe the dynamic response of the projectile and target during the whole process of penetration and obtain a series of analytical solutions of penetration depth based on different strength criteria. Limits and lower limits; the effect of intermediate principal stress, strength criterion and warhead sliding friction have an important influence on the anti-penetration performance of rock targets.