Study On Energy Dissipation Of Rod Tungsten Alloy Projectile Hypervelocity Impact Thin Steel Target Simulation

For more than half a century,people's research on hypervelocity impacts has been mainly applied to anti-missile defense,spacecraft space debris protection,light armor and anti-armor design,craters,and kinetic energy weapons.Analysis of energy loss during hypervelocity impact is of great significance to the analysis of hypervelocity impact.In this paper,AUTODYN /SPH method is used to calculate the numerical simulation of the ultra-high speed impact on thin steel targets with tungsten alloy.Using AUTODYN to derive particle information,using the breadth fragment search program to identify the fragment,identify the remaining projectile and the remaining target,etc.and perform statistics on the length of the remaining projectile,the speed of the remaining projectile,etc.The research on energy dissipation during hypervelocity impact is emphasized.1 One-dimensional shock wave theory,the pressure generated instantly when the tungsten alloy hits the steel target is calculated by MATLAB programming,the particle velocity,the shock wave velocity,the target density,and the impact energy changes with the impact velocity.2 The material parameters and model parameters are checked by using the experi-mental results and numerical simulation results.The rationality of the selected parameters is proved,and the numerical simulation results are calculated by using the model parameters.Add a monitoring point to the model.According to the data of impact monitoring point,the rule of pressure change and density change and deformation of impact target edge are obtained.3 Based on the numerical simulation results,based on the MATLAB language's breadth search fragment program,the recognition of the impacted target fragment,the remaining projectile,and the target plate,and the statistics of the number,quality,and the related energy of the remaining projectile fragments.Change rule of the impact process,When the projectile hits the thin steel target at super high speed,the most energy loss of the projectile is to form the kinetic energy of the fragment of the projectile material.Less energy is lost in the form of elastic plastic properties,internal energy and target vibration kinetic energy.In the event of an ultra-high velocity section impact,other conditions must be certain.As the impact speed increases,the larger the number of fragments produced by the fragmentation of the target,the more the energy loss of the projectile.4 Analyses the influence of the impact speed,diameter of the projectile,and thickness of the target plate on the erosion length of the remaining projectile after passing through the target.Research on the regularity of total energy dissipation,when the change of impact speed,diameter of the projectile,and thickness of the target plate;Under the different impact velocity,gain the every moment of the energy change in the processing of the impact.The conclusions have an great significance to experimental design and engineering application.