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

Abstract

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 high-speed 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.