考虑摩擦因数变化的弹体高速侵彻混凝土质量侵蚀模型研究

Study on mass erosion model of projectile penetrating concrete at high speed considering variation of friction coefficient

弹体在高速侵彻混凝土介质时,由于弹靶之间强烈的局部作用,导致弹体发生质量损失和弹头钝化。为进一步探究弹体高速侵彻混凝土靶质量侵蚀效应及其影响因素,基于热熔化机制及变摩擦因数模型,考虑弹体侵彻过程中头部形状变化,修正了弹体高速侵彻混凝土质量侵蚀模型。为验证模型的可靠性,基于30 mm弹道炮平台,开展了卵形弹体高速(700~1000 m/s)侵彻典型混凝土靶体实验,获得了弹体高速侵彻质量侵蚀结果。结合理论模型对本文实验及文献实验数据进行了对比分析计算,验证了本文修正模型的可靠性。结果表明:弹体侵彻过程中,滑动摩擦项占总摩擦力的10%~40%,它对弹体侵彻过程的影响不能被忽略;考虑摩擦因数变化的质量侵蚀模型预测结果与已有实验数据吻合得较好;与本文实验数据的最大误差不超过7%,能较准确地预测不同工况下弹体的质量损失。

When the projectile penetrates into the concrete medium at high speed,the mass loss and nose blunting occur due to the strong local interaction between the projectile and the target.In order to further explore the mass erosion effect of highspeed projectile penetrating concrete target and its influencing factors,based on the thermal melting mechanism and variable friction coefficient model,the mass erosion model of high-speed projectile penetrating concrete target was modified considering the change of projectile nose shape during penetration.In order to verify the reliability of the model,based on the 30 mm ballistic gun platform,the oval projectile penetrating typical concrete targets at high velocities ranging from 700 to 1000 m/s was carried out,and the mass erosion results of high-speed penetration were obtained.Combined with the theoretical model,the reliability of the modified model is verified by analyzing the test data in this paper and the literature.The results show that the sliding friction term accounts for 10%−40%of the total friction in the process of projectile penetration,and its influence on the penetration process can’t be ignored.The prediction results of mass erosion model considering the variation of friction coefficient are in good agreement with the existing test data,and the maximum error with the test data in this paper is less than 7%,which can accurately predict the mass loss of projectile under different working conditions.