FraMCoS 6 2007 Catania, Italy

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 au- thors to handle impact and penetration problems in concrete. In this modified version a new continuous pres- sure-shear function is adopted where the influence of the third…

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Year 2007
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Abstract

A modified version of the Holmquist-Johnson-Cook (MHJC) model was developed by the au- thors to handle impact and penetration problems in concrete. In this modified version a new continuous pres- sure-shear function is adopted where the influence of the third deviatoric stress invariant is considered; in ad- dition, 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 ob- tained for two concrete qualities and perforation of concrete slabs by pointed projectiles is considered nu- merically and compared with experimental results from the literature. Ballistic limit assessments with devia- tions under 8 % when compared to the experiments are obtained.