洛伦兹力与温度场作用下枢轨摩擦磨损特性

Wear Characteristics between Aramture and Rails under the Action of Lorentz Force and Temperature Field

电枢与轨道间摩擦磨损直接影响着枢轨接触状态,进而影响着电磁轨道发射装置的使用寿命和发射效率.因此针对焦耳热与摩擦热作用下接触面温度纵向扩散特性,建立温度作用下Archard磨损模型分析温度对枢轨间磨损的影响.结果表明:枢轨间磨损量主要发生在电枢表面,且最大磨损量集中在电枢尾翼边缘区域.随着电枢运动过程,枢轨表面温度逐渐升高,接触区域材料的弹性模量和硬度降低,枢轨间磨损量增大.接触表面磨损量增大也反映出了枢轨接触面温度升高加速了电枢表面的烧蚀.

The friction and wear directly affect the contact state between the armature and rails,which in turn affect the service life and launch efficiency of the electromagnetic launcher. Therefore,considering the longitudinal diffusion characteristics of the contact surface temperature under the action of Joule heat and friction heat,the Archard wear model was established under the action of temperature to analyze the influence of temperature on the wear between the armature and rails. The results showed that the amount of wear between the armature and rails mainly occurred on the surface of the armature,and the maximum amount of wear was concentrated on the edge of the armature tail. As the armature moved,the temperature of the contact surface gradually increased,the elastic modulus and hardness of the material decreased,and the amount of wear between the armature and rails increased. The increased wear on the contact surface also reflected that the increase in the temperature of the contact surface accelerated the ablation of the armature surface.