Fracture of high-strength armor steel under impact loading

摘要: Abstract Mars® 300 is an ultrahigh hard armor (UHHA) martensitic steel designed for ballistic protection. It available in sheets of different thicknesses and also as perforated plates with a periodic pattern cylindrical holes. Installed add-on layer front main armor, its aim to cause deflection or fragmentation small-caliber projectiles. In the present study, impact process investigated hybrid experimental-numerical approach. Ductile fracture experiments are carried out at stress states, strain rates temperatures on range flat specimens identify plasticity response. The model composed von Mises yield surface, non-associated anisotropic flow rule, combined Swift–Voce hardening law Johnson–Cook type rate temperature-dependency. To predict onset fracture, state rate-dependent Hosford–Coulomb initiation used. Impact performed targets homogenous by accelerating projectiles single-stage gas gun. Depending location, three failure mechanisms identified plate. Subsequently, finite element simulations using calibrated material thoroughly analyze experiments. A very good prediction cases their patterns obtained, validating applicability loadings.