Friction Model of Projectile Engraving Process Based on Temperature Correction

doi:10.3969/j.issn.1000-1093.2021.06.004

Abstract

Abstract: During the extrusion of projectile into a barrel，the friction between the cartridge belt and the barrel not only affects the internal ballistic characteristics，but also affects the prediction of barrel life. The friction between the rotating band and the barrel has the characteristics of high speed and high contact pressure during the engraving process of projectile. A friction model for describing the friction characteristics of rotating band and barrel is proposed based on the deformation mechanism of rotating band during engraving process of projectile. In the proposed model，the contact pressure，sliding speed and the effect of elevated temperature on the surface melting of rotating band during burst of fire are considered. A coupled thermo-mechanical finite element model for projectile matching is established to analyze the changes in the stress of rotating band and the temperature during engraving process. The proposed model is compared with the models in Refs.［24-25］. The velocity of projectile after engraving and the surface temperature change of rotating band are analyzed in detail.The result shows that the proposed friction model can accurately describe the frictional characteristics of barrel and rotating band during engraving process.

Key words: projectile, projectileengravingprogress, finiteelementmethod, thermalmechaniccoupling, projectilecoupling, barrel, temperaturecorrection

CLC Number:

ZOU Libo， YU Cungui， FENG Guangbin， HOU Baolin， ZHONG Jianlin， LIU Xianfu. Friction Model of Projectile Engraving Process Based on Temperature Correction[J]. Acta Armamentarii, 2021, 42(6): 1148-1156.

References ［1］

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