杆式EFP用钽钨合金JC失效模型参数

Due to the limitation of current numerical simulation model in predicting the fracture of rod-shaped tantalum-tungsten (Ta-W) alloy explosive formed projectile (EFP) during the forming process, the tests of the mechanical properties of Ta-W alloy specimen under different stress, strain rate and temperature conditions were carried out to obtain the parameters of Johnson-Cook failure model. The forming process of Ta-W EFP with typical charge structure was simulated by LS-DYNA software using the Johnson-Cook failure model and adaptive algorithm. X-ray experiment was carried out to verify the effectiveness of the numerical simulation. When the failure model was used in the numerical simulation of rod-shaped EFP molding, the prediction of EFP fracture was better, and the errors between the simulation results and the experiment results were less than 9%. The results revealed that the formation and fracture of rod-shaped EFP can be accurately predicted by the failure model.