A Modified Jones Mass Loss Model Considering the Projectile Material Hardness and Validation via High-speed Penetration of AerMet100 Projectiles

The significant mass loss of projectile during high-speed penetration has a significant effect on penetration capability. However, the existing mass-loss models fail to adequately take into account the influence of projectile material hardness. A large amount of experimental data on the mass loss of projectiles during high-speed penetration is analyzed using the Silling empirical relationship. It is found that the hardnesses of concrete aggregates and projectile materials are the important factors affecting the mass loss of projectiles. The influence of the hardness of projectile material on the mass loss of projectile is greater than that of the hardness of concrete aggregates. The influence law of projectile material hardness on the mass loss is obtained through fitting. The hardness correction coefficient η of concrete aggregate and the correction coefficient ξ of projectile material hardness are introduced in the Jones model. The calculated results of the modified model are in good agreement with the experimental results of different projectile-target combinations. Then, a two-stage light gas gun is used to conduct the high-speed penetration experiments of AerMet100 projectile in the speed range of 1200 - 2200m / s. The dimensionless penetration depth and mass loss at different penetration speeds are obtained to further verify the effectiveness of the modified model under the conditions of higher hardness projectile and higher penetration speeds. Meanwhile, it is found that the AerMet100 projectile has a higher penetration depth and lower mass loss compared to other materials, indicating that the hardness of projectile material can be increased to reduce the degree of projectile erosion and improve the high-speed penetration ability.