Simulation study on the influence of slope bore processing error on internal ballistic performance

DOI:	10.11809/bqzbgcxb2023.12.029
Keywords:	processing error; coupling of projectile and barrel; FEM; internal ballistic performance; forcing cone
Abstract:	In order to study the impact of the change of distance between the projectile and the slope bore along the axis of the barrel due to the machining error of a small caliber gun barrel on the internal ballistic performance,the Johnson Cook material model is used to establish the finite element simulation model of the missile gun coupling dynamics through Abaqus commercial finite element software, and the Internal ballistics equation is embedded into the finite element model through the secondary development of the VUAMP subroutine. The movement process of the projectile in the bore is calculated, and the influence of different machining errors on the Internal ballistics performance is compared and analyzed. The results indicate that due to machining errors, the free travel distance of the projectile before engraving is reduced, and the resistance during the engraving process increases, leading to a decrease in the initial acceleration of the projectile. Throughout the entire internal ballistic phase, the decreased post projectile volume leads to an increase in the pressure at the base of the projectile, the internal ballistic pressure peak increases, and the muzzle velocity of the projectile increases. The results can provide reference for the subsequent design and experiment of the gun.
Issue:	Vol. 44 No. 12 (2023)
Published:	2023-12-28
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