Computational model for the penetration simulation of shaped charges fired at large standoff

Shaped charges are a type of very powerful and useful warheads to penetrate and perforate armors and protective structures,as the metal jets formed by the detonation of the shaped charge possess a hyper velocity.However,the jet of a shaped charge will break up to pieces after the jet has traveled a long distance in terms of its charge diameter,since the velocity gradient is also very high along the jet.As a result,the penetration capacity of the broken jets decreases considerably.The penetration and perforation capability of the the shaped charge jets fired at the standard standoff has been studied extensively.But only very limited information on the penetration performance of the shaped charges fired at large standoff is available in the open literature so far.By using the hydrocode AUTODYN,the formation of shaped charge jet and the geometry and velocity profile of the jet traveling a large standoff were simulated,then the penetration performance of the broken jets on different types of targets were studied both experimentally and numerically.By comparing the simulation results with the experimental data,an effective computational model was proposed for the penetration and perforation simulation of shaped charges fired at large standoff.The living firing tests show that the proposed model can yield good penetration prediction.