Research On Compact Tantalum Alloy EFP Warhead

In order to improve the damage performance of the EFP warhead in the compact terminal-sensitive projectile,the application of the bismuth alloy material as a hood in the EFP warhead was studied.The quasi-static and Hopkinson pressure bar test technology and the AUTODYN-2D finite element numerical simulation were used.Technical and warhead static power test technology,research and design of large-caliber bismuth alloy EFP warhead.Firstly,the preparation of the bismuth alloy Hopkinson pressure bar test piece and the quasi-static test piece were carried out,and the quasi-static compression test and the Hopkinson pressure bar test were carried out to obtain the ?-? curve of the Ta2.5W material at different strain rates.According to the experimental data,the Ta2.5W material was calibrated and fitted based on the Johnson-Cook constitutive model parameters,and the parameters of the Ta2.5W material constitutive model were obtained.Secondly,based on the obtained Tantalum alloy constitutive model,the numerical model of the EFP warhead of the cockroach type hood was established,and the energy conservation method was used to analyze the forming of the EFP warhead with built-in sensitive devices.The molding process of Ta2.5W hood was simulated and the single variable method was used to change the structure and materials of sensitive devices.The influence of structural parameters of sensitive devices,sensitive device materials and millimeter wave radome on EFP damage formation of bismuth alloy was studied.Then,the influence of the structural parameters of the deformed wall-thickness type mask on the formation of Ta2.5W damage element was studied.The orthogonal design was used to optimize the design of the hood structure.The optimized structural parameters of the bismuth alloy hood warhead were selected.The expected estimation of the EFP shape and speed was obtained through simulation.Finally,the EFP warhead flight stability test and the penetration power test were carried out to verify the reliability of the simulation calculation results.At the same time,the effects of the lap joint structure,the W content in the niobium alloy and the radome of the sensor on the EFP warhead were also studied.