Abstract
Barrel wear leads to a degradation in the ballistic performance of projectiles, conventionally manifested as a reduction in projectile muzzle velocity and a decrease in firing accuracy. Based on the actual wear distribution of the gun barrel, this paper establishes a parametric model of the worn barrel. By integrating the coupled effects of propellant combustion and mechanical interaction, a dynamic model of the barrel‐projectile interaction across four life periods is developed. The underlying mechanisms between barrel wear, interior ballistic performance degradation, and projectile muzzle state are systematically investigated. The strong agreement between simulation and experimental results verifies the accuracy of the proposed parametric modeling method and the coupled model. The results indicate that in the later periods of barrel life, the projectile’s muzzle velocity does not exhibit a significant decline; however, notable changes occur in the projectile’s muzzle spin rate and disturbance. The decrease in the projectile’s muzzle spin rate and the increase in disturbance are identified as the primary reasons for barrel end‐of‐life.