Anlysis of Rifling Land Damage Mechanism of Gun Barrel

doi:10.3969/j.issn.1000-1093.2014.11.002

Abstract

Abstract: In the live firing of a large caliber gun, a fracture damage was found on the bilateral edge of the lands in an initial segment of barrel. In order to reveal the fault reason and take measure to avoid the recurrence of this fault, a nonlinear finite element analysis model of coupling system formed by barrel and projectile is established based on dynamic nonlinear finite element method. Several influence factors, such as inaccurate bullet loading, initial loading angel, inhomogeneous friction and gap between barrel and bullet, are taken into account synthetically for dynamic response analysis of the coupling system. The influence of impact loading caused by the inaccurate bullet loading on the dynamic behavior of barrel material is investigated. The results show that the equivalent stress caused by projectile in the engraving process of bullet in the initial segment of barrel is already close to the yield limit of barrel material, the impact force between the bearing band and barrel is increasesd by 3.7 times due to the inaccurate loading, and the dynamic fracture toughness of the barrel material is decreased by 35.6%, resulting in a fracture damage on the bilateral edge of lands in the initial segment of barrel. The phenomenon of rifling land damage is recurred in the test of living firing.

Key words: ordnance science and technology, barrel, rifling land damage, engraving process, finite element method

CLC Number:

TJ303.1

ZENG Zhi-yin, MA Ming-di, NING Bian-fang, GAO Xiao-ke. Anlysis of Rifling Land Damage Mechanism of Gun Barrel[J]. Acta Armamentarii, 2014, 35(11): 1736-1742.

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