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APPLICATION OF A BUILDING BLOCK APPROACH (BBA) FOR A HIGH STRENGTH STEEL TRIAXIALITY DEPENDENT STRENGTH MODEL CALIBRATION: FROM DATA COLLECTION TO MODEL VALIDATION
Abstract
This paper details a Building Block Approach (BBA) methodology developed to fit a material model for a High Strength Steel (HSS) faced to blast/ballistic events. This model includes mesh sensitivity, strain rate influence and triaxiality effect on plastic failure. Data collection in different loading conditions in quasi-static and dynamic regimes has been done. A unique set of parameters have been found by an optimization loop that combines both characterization tests and associated numerical simulations. Validation tests on large square clamped plates at two velocities have been performed in different triaxiality conditions using three nose shapes (flat, hemispheric and conical) to confirm the optimized set of parameters at failure initiation and with perforation. Final numerical simulation of the validation tests showed that the final set of parameters brings a very good agreement: less than 5% discrepancy on remaining kinetic energies.
DOI
10.12783/ballistics22/36175
10.12783/ballistics22/36175
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