Modelling ballistic perforation of soda-lime glass using ductile and brittle incubation time fracture criteria

A hybrid experimental-numerical investigation of the ballistic perforation of soda lime glass is presented. Two types of ballistic tests were conducted and simulated muerically. In the first a square plate made of soda-lime glass is impacted by hard round steel spheres, and in the second a soda-lime glass round plate is normally impacted by a long flat cylindrical projectile made of hard tool steel. A simple elastic perfectly plastic material model (Mises plasticity), for which the yield stress is pressure-dependent, was used for glass material model. Two failure/fracture criteria were applied simultaneously: ductile and brittle. The brittle criterion which was used is an incubation time criterion, while the ductile consists of maximum equivalent plastic strain and maximum plastic work. Results are also obtained by using the JH2 model. It is shown that the suggested material model with the simultaneous application of both fracture criteria can successfully predict the exit velocity and the associated brittle damage during ballistic perforation of soda lime glass.