基于温度修正的弹丸挤进身管过程摩擦模型

弹丸挤进身管过程中，弹带与身管之间的摩擦特性不仅对内弹道特性产生影响，而且影响对身管寿命的预测。在弹丸挤进过程中，弹带与身管之间的摩擦具有高速高接触压力特性。基于弹丸挤进过程中的弹带变形机理，提出一种新的描述弹带与身管之间摩擦特性的摩擦模型，该模型考虑了接触压力、滑移速度以及连发射击时温度升高导致弹带表层熔化的影响；建立热力耦合的弹炮匹配有限元模型，分析弹丸挤进过程弹带应力及温度变化，并与文献［24-25］提出的摩擦模型进行对比验证，研究弹丸挤进过程中的弹丸速度和弹带表层温度变化规律。结果表明：新的摩擦模型能够准确描述弹丸挤进过程中弹带与身管之间的摩擦特性。

Friction Model of Projectile Engraving Process Based on Temperature Correction

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.