侵彻过程塑性波在钨合金弹体中传播速度的研究

Research of plastic wave velocity in tungsten alloy penetrators during penetrating

根据回收弹坑中钨合金穿甲弹在侵彻结束时已完全破坏的特征,采用二级轻气炮研究了撞击时钨合金中塑性波传播的特性。结果发现,在撞击时钨合金中的塑性波传播速度和弹性波传播速度有相同的量级,分别为4.208km/s和3.067km/s,塑性波仅比弹性波略慢一些,考虑到实际侵彻情况不是一维应变问题,和侵彻过程的温升比氢气炮实验时要高,实际塑性波传播速度要比这个值低。但是根据计算获得的侵彻时间,和侵彻结束时弹体已完全破坏的情况分析,塑性波的速度应与计算值有相同的量级。这些结果与分析侵彻过程中做出的在弹体中塑性波传播速度比弹性波传播的速度要慢的多的假设不同。弹体尾部在塑性波传播过程中的破坏,可能会被反向传播的弹性波从弹体上拽掉,这将降低弹体携带的能量,从而影响到穿深。

According to the characteristic of remain tungsten alloy penetrators in recover crater that was destroyed in penetrating end, spread peculiarity of plastic wave of tungsten alloy in impact has been studied using two stage light gas gun. Results show that in impacting plastic wave speed and elasticity wave speed in tungsten alloy are same measurement,4.208 km/s and 3.067km/s respectively, plastic wave speed was slightly slower than elasticity wave. Penetrating isn't actually one dimension strain issue and penetrating process temperature was higher than experiment in light gas gun, so plastic wave speed was actually lower. But according to the penetrating time obtained by calculating, and analyzing destruction of penetrators in penetrating process end, one can say that plastic wave speed should has same measurement with calculation. All these results are difference with the assumption made for analysis that plastic wave speed was actually much lower than elasticity wave speed in penetrating process. Destruction of penetrators tail in a plastic wave spread process can be pulled down by elasticity wave backward spread, this can take energy out from penetrator and bring effect on penetration depth.