Research On Friction And Wear Properties And Numerical Simulation Of Projectile Band Of Copper Alloy

The new generation of large-caliber artillery system requires high chamber pressure,high muzzle velocity and high rate of fire,which also caused serious wear of the traditional H90 brass band during the internal ballistic process.Therefore,the fundamental way to solve this problem is to study the high-speed friction and wear mechanism of copper alloy rotation band material and develop new rotation band material.In this paper,the high-speed sliding friction and wear properties and failure mechanism of copper alloy elastic belt were analyzed by means of friction and wear test,microstructure observation and finite element numerical simulation.The morphology and metallographic observation of copper alloy rotation band material recovered from shooting range test showed that the traditional brass rotation band material has suffered more serious wear,which is mainly due to the dynamic recrystallization of brass during the ballistic process of barrel.The friction and wear tests of H90 brass and B10 cupronickel alloy showed that the increases of wear loss with the increase of pressure load and friction speed.Under the same conditions,the wear of H90 brass is more than 30%higher than that of B10.The metallographic structure of H90 brass friction zone surface appeared dynamic recrystallization zone,fiber structure and strip grain in turn.SEM and EDS analysis showed that the wear mechanism was mainly abrasive wear,delamination wear and melting wear.However,B10 cupronickel surface layer only produced a thin recrystallization area,and the wear mechanism was mainly characterized by delamination wear.The two-dimensional numerical simulation of the reciprocating friction and wear behavior of H90 brass/steel ball friction pair was carried out by using ANSYS/LS-DYNA finite element software.The results showed that the friction and wear of the brass alloy only occurred in the region of tens of microns below the contact surface,and the temperature of the contact surface rose sharply due to the interaction of the friction heat and the plastic work heat,reaching the dynamic recrystallization temperature.T_cr=T_DRXcan simulate the severe wear behavior caused by dynamic recrystallization softening of materials by adding the critical point failure control criterion.When the muzzle temperature,the maximum sliding velocity and the pressure load are increased,the wear rate of the brass specimen increases obviously.Increasing the control temperature of dynamic recrystallization failure can reduce the wear rate obviously.In this paper,the friction and wear properties and mechanisms of two kinds of rotation band materials were studied,which has important theoretical significance and engineering application value for understanding the internal ballistic wear mechanism of rotation band materials and developing new alloy rotation band materials.