Analysis of Parameters for the Johnson-Cook Strength Model for 2-in- Thick Rolled Homogeneous Armor

摘要

Yield strength obtained from quasi-static strength data for rolled homogeneous armor (RHA) was combined with dynamic strength data for 2-in (51-mm) RHA to generate Johnson-Cook parameters for 2-in RHA. One parameter was fixed based on the quasi-static strength data, and a least-squares method was used to fit the others individually. The fit was tested with CHT by simulating the penetration of stacks of 2.5-in-thick (63.5-mm) RHA plates (the closest available experimental data). Parameter analysis and comparison of the simulations to experiment substantiated the approach.