钢轨表面疲劳裂纹扩展机制

doi:10.13228/j.boyuan.issn0449-749x.20160352

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Abstract The contact fatigue of wheel and rail was studied. Based on the Hertz contact theory and the coulomb law of friction， the calculation model of wheel/rail contact fatigue with rail surface crack was established， and the influence of loading position， axle load， friction coefficient on the crack propagation rate was analyzed， respectively. The results show that， the surface crack of wheel/rail contact includes sliding mode and opening mode， the major damage of crack is the sliding mode， and the most dangerous position for crack leading to fracture is the edge of contact area. The axle load and friction are two important factors affecting the fatigue of rail. As the axle load increases， the[KI]and[KII]of stress intensity increase. The[KI]and[KII]under the axle load of 20 t increase by 359% and 185%， respectively， compared to that under the axle of 10 t. With the increase of the coefficient friction， the[KI]and[KII]increase. The[KI]and[KII]under the state of friction coefficient 0.3 increase by 108.7% and 119.3%， respectively， compared to that under no friction. It is clear that the friction force can accelerate the crack growth obviously. Reducing the friction coefficient is an effective method to retard the fatigue of wheel/rail contact， and the solid lubricant should be used firstly when curing the rail.

Received: 01 August 2016 Published: 18 April 2017

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LIU Jie. Analysis of propagation mechanism of fatigue crack on rail surface[J]. Iron and Steel, 2017, 52(4): 67-71.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20160352 OR http://www.chinamet.cn/Jweb_gt/EN/Y2017/V52/I4/67

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