MODELLING KINETIC ENERGY PROJECTILE FAILURE DURING STRUCTURED ARMOUR PERFORATION

摘要

In this study, we examined the relevance of several material failure modelsapplied to the case of the perforation of an oblique target by a slenderkinetic energy rod made of a tungsten alloy. We noticed that none of themcould reflect the overall behaviour of the projectile, but also that all of themare correct in a certain dynamic regime. Thus, it is proposed to mix two ofthese models, the maximum plastic strain model and the Xue Wierzbickimodel in order to cover all the dynamic regimes seen by a penetrator duringperforation. When the material is loaded with high strain rates and pressures(i.e. the nose during the penetration phase), it follows the maximum plasticstrain criterion, while when the loading is less severe (i.e. the rest of the rod,which is not in contact with the target), the Xue Wierzbicki model is used.