Study on impact damage mechanism of gun propellant based on bonding contact model

Abstract As the main launch energy of barrel weapon, dynamic mechanical properties gun propellant is very important to evaluate safety. Through transverse drop hammer impact damage test at room temperature and initial vivacity ratio propellant, crack growth law fracture degree damaged were obtained separately. Based on Hertz-Mindlin bonding contact model, discrete element model rosette 19-hole was established, simulation carried out. The mechanism acquired, which also verified by tests. results show that can accurately describe propellant. research this paper be used predict abnormal chamber pressure caused provides a means for property evaluation 3D printing lays theoretical foundation quantitative