At what stage will steel rails contact fatigue damage occur

Everyone knows that metal is fatigued, and it will damage the metal when the metal is in the fatigue transition state for a long time. The steel rails we often use also have metal fatigue. What are the common stages of steel rails contact fatigue damage? Let's take a look at the editor below.

1. The change of the tread shape, the unevenness of the steel rails tread, and the saddle wear at the weld will increase the impact of the wheel on the rail.

2. The formation of joint contact fatigue is due to insufficient metal contact fatigue strength. When the point of maximum shear stress exceeds the shear yield limit, this point will become a plastic zone.

3. The surface metal is destroyed. Due to the cold work hardening of the metal, the hardness of the rail head working surface will continue to increase. When the total mass is 150~200mt, microcracks will form on the surface of the rail head. Control the shape of debris. The use of quenching, the development of high-quality heavy steel rails, the reform of the old rail reuse system, and the rational use of rails; and laying rails according to steel rails material classification can all reduce steel rails contact fatigue damage.

Therefore, the frequently used steel rails must be replaced in time after fatigue damage.