High Strength Steel (HSS) characterization for numerical simulation of defence applications: from data collection to triaxiality model validation

This paper details the methodology developed to fit a material strength/failure model with mesh sensitivity, strain rate influence and triaxiality effect on plastic failure for a blast/ballistic configuration for a HSS plate. Data collection in different loading conditions in quasi-static and dynamic regimes has been done, following a given tests matrix based on the customer phenomenological analysis. A complete set of parameters has been find by numerically reproduce the tests and find the best compromise to fit all the tests performed with a unique set. Tests on large square clamped plates have been performed with three nose shapes (flat, hemispheric and conical) to validate the set of parameters. One case with perforation and another at failure initiation have been done for each geometry. Numerical works using the final set of parameters have shown very good agreement in the various impact conditions.