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The peeling near the fillet on the orbital edge is mainly caused by the following three reasons: the longitudinal fatigue crack caused by inclusions or contact shear stress leads to exfoliation; the guide wheel induces shear stress alternating cycles on the outer curve of the curve to promote the outer track The fatigue of the railhead leads to peeling; poor repair of wheels and rails accelerates the development of peeling. Normally, exfoliation will cause stress concentration in the notched zone and affect the ride comfort, increase the dynamic impact, and promote the emergence and development of cracks in the notch area. The existence of notch area will also hinder the development of metal plastic deformation and reduce the plasticity index of the rail.
Nuclear head injury is the most dangerous form of injury. It will suddenly break under the action of the train and seriously affect traffic safety. The main cause of a track head nuclear damage is the presence of micro-cracks or flaws (such as non-metallic inclusions and white spots) inside the rail head. Under repeated dynamic loads, the rail head appears very complicated inside the rail running surface. The combination of stresses causes the nucleation of fine cracks to first nucleate, and then develops around the rail head until the steel material around the core is not sufficient to provide sufficient resistance, and the rails break down in the unlikely event of a sign. Therefore, the defect of the internal material of the rail is the internal cause of nuclear damage, and the external load is the external cause of the nuclear injury. The development of nuclear injuries is related to traffic volume, axle load and speed, and the state of the line plane. In order to ensure the safety of traffic, regular inspections shall be carried out on the rails.
Measures to reduce the contact fatigue damage of rails include: purifying the rail steel and controlling the form of debris; using quenched steel rails to develop high quality heavy rails and improving the mechanical properties of the rail steel; reforming the old rail reuse system and rationally using rails; rail grinding; Rail steel material classification tracks and so on.