Erosion and wear of barrel and its impact on projectile force

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Abstract During gun firing, the inner surface of the barrel will undergo erosion and wear, leading to changes in the gap between the projectile and barrel. This cause the load environment in which the projectile moves inside the barrel to become more severe, and the cutting and wear of the rotating band increase. Therefore studying the erosion and wear of barrel and its impact on projectile force is of great significance for the lifespan and launch safety of the barrel. By testing the erosion and wear of the barrel with different firing numbers and analysing the anatomy of the end of life barrel, the damage and expansion patterns of the barrel were obtained. On this basis, a coupled dynamic model of projectile and barrel considering erosion and wear was established, and the influence of erosion and wear on the force acting on the motion process of the projectile inside the barrel was calculated. The results indicate that the erosion and wear value of the barrel follows a cubic polynomial along the axis, and the maximum value is located at the commencement of rifling. At the end of the barrel’s life, the engraving resistance of the rotating band is reduced by about 38.7%, the surface contact force between the rotating band and rifling land is reduced by 36.4%, and the impact force between the bourrelet and barrel is increased by about three times.