Research on the Influence of Damaged Bore of a Large Caliber Machine Gun on Bullet Engraving Progress

doi:10.3969/j.issn.1000-1093.2018.12.005

Abstract

Abstract: In order to study the influence of damaged bore on the dynamic engraving process and find the key factors significantly influencing a barrel life, the accurate finite element analysis (FEA) models of large caliber machine gun barrels in different life periods are established based on the evolution rule of bore damage obtained through a large number of firing tests. The data of bullet surface morphology and moving posture during engraving process are obtained through numerical simulation which combines the interior ballistic process and the explicit finite element method through Fortran subroutines. The coupled model of bullet and gun barrel is proved to be effective by comparing the calculated results with experimental results. The simulated results show that three major influencing factors, such as the increase in the offset of bullet mass center and the swing angle of bullet, the variation in bullet surface topography and aerodynamic parameters, and the reduction in the driving side force and rotational velocity of bullet due to the severely damaged driving side, result in the reduction in exterior ballistic flight stability and the barrel life end. Key

Key words: barrel, boredamage, bulletengraving, surfacemorphology, movingposture, finiteelementmethod

CLC Number:

TJ203⁺.1

SHEN Chao, ZHOU Ke-dong, LU Ye, QIAO Zi-ping. Research on the Influence of Damaged Bore of a Large Caliber Machine Gun on Bullet Engraving Progress[J]. Acta Armamentarii, 2018, 39(12): 2320-2329.

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第39卷第12期
2018 年12月兵工学报ACTA
ARMAMENTARIIVol.39No.12Dec. 2018

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