Equation of Penetration and Crater Growth by Shaped Charge Jet under the Influence of Shock Wave
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摘要: 当聚能射流侵彻速度大于靶板声速时，由于冲击波的产生导致波阵面后材料的状态参数发生改变，影响聚能射流的侵彻扩孔过程，致使波阵面前后不能直接应用伯努利方程求解。在考虑侵彻过程中冲击波影响的基础上，对射流轴向侵彻和径向扩孔的力学特性进行了分析，并对冲击波的传播和衰减进行了假设，着重探讨侵彻速度大于靶板声速时冲击波的影响。针对侵彻速度大于和小于靶板声速两种情况，建立了相应的侵彻模型，提出了一个新的聚能射流侵彻扩孔方程。将该方程与Szendrei-Held模型进行了比较，结果表明，新模型更符合Held等人的实验数据，冲击波对轴向侵彻的影响远小于对径向扩孔的影响。Abstract: When the penetration velocity is greater than the sound speed, a shock wave will be formed which leads the state parameters of the material change after shock wave front. As the shock wave affects the process of jet penetration and crater growth, Bernoulli equation can not be used directly across shock wave front. On the basis of considering the influence of shock wave during jet penetration, the mechanical properties of axial penetration and radial crater growth are analyzed in the process of shaped charge jet penetration, and the propagation and strength degradation of shock wave are assumed. The penetration model is established for the two cases of the penetration velocities greater or less than the sound speed of target respectively and a new equation of shaped charge jet penetration and radial crater growth is proposed. Compared with Szendrei-Held model, the results show that this model is more suitable for the experimental data of Held et al. Moreover, the influence of shock wave on axial penetration is much smaller than that on the radial crater growth.
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Key words:
- shaped charge jet /
- penetration and crater growth /
- impact dynamics /
- shock wave
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