Ballistic limit assessment for concrete slabs using the MHJC concrete model

A modified version of the Holmquist-Johnson-Cook (MHJC) model was developed by the authors to handle impact and penetration problems in concrete. In this modified version a new continuous pressure-shear function is adopted where the influence of the third deviatoric stress invariant is considered; in addition, a new strain-rate sensitivity formulation is included and finally three damage variables describing the tensile cracking, shear cracking and pore compaction mechanisms are introduced. Model parameters are obtained for two concrete qualities and perforation of concrete slabs by pointed projectiles is considered numerically and compared with experimental results from the literature. Ballistic limit assessments with deviations under 8% when compared to the experiments are obtained.