Study On Penetration Performance Of PTFE-Cu Particle Jet Based On SPH Method

As modern tanks is equipped with explosive reactive armor,the traditional shaped charge warhead combat capability of the tank is weakened.People began to explore new ways of damage to explosive reactive armor.Domestic and foreign scholars found that the polytetrafluoroethylene(PTFE)as a prestage liner material of the tandem warhead,which can be formed a low density jet penetrates the reaction armor without detonation,opening the channel for the rear jet.But the PTFE jet has the disadvantage of insufficient penetration capability,in order to improve the penetration ability of the tandem warhead's front stage jet,adding copper powder in the PTFE matrix to obtained the modified polytetrafluoroethylenecopper(PTFE-Cu).In this paper,PTFE-Cu material is used as the front liner of tandem warhead,Studied on the penetration performance of PTFE-Cu shaped charge formation of particle jet.Based on the study on the development of the low-density jet technology and particle jet technology at home and abroad,PTFE-Cu material was used a prestage liner material of the tandem warhead.Using pulsed x-ray photography technology to observed the forming of PTFECu liner under the action of the explosion load.It was found that the PTFE-Cu liner does not form a condensed jet under the action of an explosion load but forms a scattered particle jet.To develop a numerical study of the formation of particle jet in a PTFE-Cu liner,comparative analysis of simulation results of Euler algorithm and SPH algorithm.The results show that PTFE-Cu particle jet molding results based on SPH algorithm are consistent with X-ray photography results,and SPH algorithm is more suitable than Euler's algorithm for numerical simulation of PTFE-Cu particle jet molding.To better analyze the characteristics of the PTFECu particle jet.Based on the SPH method,numerical Simulation the performance of the PTFECu,PTFE and Cu liner Formation of Jets under explosive load.Analyzed the influence on the formation of PTFE-Cu particle jet about the particle spacing,the thickness of the liner,the cone angle of the liner,and the blasting height.In order to measure the penetration performance of PTFE-Cu particles jet to steel target when PTFE-Cu as a prestage liner material of the tandem warhead.Numerical simulation of the PTFE-Cu,PTFEand Cu jet penetrating 45# steel targe,and through the experiment to verify.The results show that PTFE-Cu particle jet increased 31% in penetration depth performance over PTFE particle jet and 95% over Cu jet in opening hole performance.Therefore,the PTFECu is suitable for the prestage linerr material of the tandem warhead.In order to study the penetration performance of PTFE-Cu particles jet to the shell charge when PTFE-Cu as a prestage liner material of the tandem warhead.Numerical simulation of the PTFE-Cu particle jet penetrating shell charge.Analyzed typical characteristics of explosive,combustion,and unreacted reaction of shelled explosive under particle jet impactting.Obtained that the threshold value for shock initiation of a shell charge.Under studied the effect of the shaped charge structure on the penetration of the PTFE-Cu particle jet into the shelled charge,optimized the structure parameters of shaped charge by orthogonal method.It is proved by experiment that using PTFE-Cu as a prestage liner material of the tandem warhead,the formation of PTFE-Cu particle jet under the explosion load can achieve the wear of the shelled charge without detonation,avoiding the influence of the prestage warhead detonating shelled charges on the ability of the main jet to penetrate behind it.Increased the penetration capability of the tandem warheads.Provides a reference for the design of a new tandem warhead.