THE EFFECT OF VOID GROWTH ON TAYLOR CYLINDER IMPACT EXPERIMENTS

Taylor cylinder impact experiments have provided useful information concerning the dynamic response of materials. In an effort to obtain data at elevated strain rates, Taylor experiments have been conducted at high velocities. Sections of the recovered specimens reveal a region of porosity located near the base of the cylinders. Computational simulations have been performed to explore the effect of porosity growth on the experimentally observable parameters for Taylor impact tests. The constitutive model used to simulate the growth of voids is based on the Gurson yield surface. A robust and efficient numerical algorithm was developed and implemented into an explicit, two-dimensional, finite-element computer code. The calculations provided good qualitative comparison with experimental data.