GPU-parallelized SPH solver for accurate hypervelocity impact simulation of shaped charge jet penetration in concrete structures

Abstract

Accurately analyzing local failure areas, such as penetration or perforation in concrete structures under extreme conditions, such as those caused by shaped charge jet penetration, is of paramount importance for ensuring structural integrity and safety. This study addresses these challenging problems by developing a GPU-parallelized smoothed particle hydrodynamics solver, which incorporates advanced multiphase SPH models, complex constitutive models, and equations of state (EOS) for metal and concrete materials. Enhanced with variable smoothing lengths, this solver improves the accuracy of simulations. Numerical simulations of high-velocity impacts (HVI) on metal and concrete materials were conducted to validate the solver’s capability and precision. The simulations confirmed that shock waves propagate according to material properties, with stable pressure fields and logically coherent crack formations. Comparative analysis with experimental observations demonstrated improved accuracy, with relative errors for depth of penetration (DOP) and average borehole diameter under 5%. Furthermore, parametric tests examining variations in shaped charge geometry and concrete compressive strength showed reasonable variations in crater morphology. These results indicate that the developed SPH solver effectively addresses a wide range of shaped charge jet collision problems and presents a promising alternative to experimental methods for extreme conditions.