Study Of Squeezing In And Wear Of Large Caliber Rotating Band Under High Chamber Pressure

High-energy propellant enables modem gun to obtain higher muzzle kinetic energy,but it leads to senous wear of traditional H90 brass rotating band under high chamber pressure of launch condition,so a new type of rotating band material needs to be developed to replace H90 brass rotating band.However,a clear understanding of wear mechanism of rotating band is the fundamental way to solve this problem.In this paper,metailographic microscope,scanning electron microscope,energy dispersive spectrum were used to analyze the wear mechanism of H90 brass rotating band and B19 white copper rotating band through theoretical analysis of material science and tribology.LS?DYNA finite element software was used to simulate the 3D model of two kinds of rotating band squeezing in the rifling,and then the simulated results were compared with the worn rotating band.The results showed that under high chamber pressure,H90 brass rotating band accelerates the ablation of the gun bore because of the large wear;the wear of B19 white copper rotating band is distinctly less than that of H90 brass rotating band.Dynamic recrystallization is the fundamental cause of wear of rotating band,it accords with the model of slight wear-severe wear of rotating band.LS-DYNA software can obtain the stress-strain change,groove morphology,internal ballistic characteristic quantity and mass wear law of rotating band in the process of squeezing in and wear.The wear results of simulated rotating band are consistent with those of recovered rotating band.This study can deepen the cognition of the coupling ot the projectile in the firing process of the gun bore,and has theoretical significance and engineering application value for optimizing the]aterial of the rotating band and improving the internal ballistic performance.