Constitutive model parameter determination from generic EFP warhead tests

摘要

The determination of liner material constitutive modeling parameters based on the results of four EFP tests, with different liner geometry's, is described in this paper. This paper presents an approach for determining an "appropriate set" of material parameters to describe the deviatoric behavior of the liner material. The Johnson-Cook and Steinberg-Guinan constitutive models are evaluated with the Steinberg model shown to be more suitable because of its upper limit on the flow stress. A set of flow stress hardening parameters are found that provide excellent correlation to the four different EFP warhead design configurations.