摩擦热对靴轨凿削临界条件的影响

Based on the material point method (MPM), the dynamic constitutive relationship between the slipper material (C300) and the rail material (U75V) was verified, indicating that the constitutive model parameters of these materials' J-C models could be extended to the case of medium-high strain rate, which could accurately describe the dynamic mechanical behavior of the material with high strain rate. Then, the influence of the temperature rise on the surface of the slipper and rail caused by friction on the critical velocity of gouging was studied. The results show that the temperature rise of the contact surface between the slipper and the rail increases the critical velocity of gouging between the slipper and the rail, and it is beneficial to improve the running speed of the rocket sled test. The research results can provide a reliable theoretical support for deepening the understanding of shoe-rail gouging mechanism and ensuring the safe and high-speed operation of the rocket sled test system.