Fatigue Analysis of Wheel/Rail Contact Based on ANSYS

doi:10.3969/j.issn.1674-0696.2015.04.34

Abstract

Abstract: Through analyzing the principle of displacement extrapolation method to solve the fracture parameter K and comparing the results of ANSYS calculation with the results of the fracture mechanics, it was showed that the accuracy of K calculated by ANSYS could reach 99.9%. Then the contact fatigue problem of wheel/rail with surface crack was analyzed. From different angles of crack, the stress intensity factors of crack tips at different locations were obtained. The results show that, the stress intensity factor KI increases with the increase of crack angle, meanwhile, the KII decreases. When the crack angle is small, the major damage of crack is sliding mode; with the increase of crack angle, the major damage of crack transforms sliding mode into opening mode. The most dangerous location of crack is at the edge of the contact area, and the solid lubricant should be used firstly in the curing process of the rail.

Key words: locomotive engineering, displacement extrapolation method, wheel/rail contact, fatigue crack, angle

摘要： 通过分析ANSYS求解断裂参数K因子的原理位移外推法，并比较ANSYS仿真计算与断裂力学的解析解结果，表明ANSYS计算K因子的精确度可以达到99.9%。对钢轨表面存在裂纹的轮轨接触疲劳问题进行研究，在不同裂纹角度下，获得不同位置的裂纹尖端应力强度因子。结果表明：随着裂纹角度的增加，应力强度因子KI增加而KII减小；在裂纹角度比较小时，裂纹以滑开型破坏为主，随着裂纹角度的增加，其破坏形式向张开型破坏转变；疲劳裂纹最危险的位置发生在接触斑边缘位置，在钢轨养护时，应选用固体润滑剂。

关键词: 机车工程, 位移外推法, 轮轨接触, 疲劳裂纹, 角度

CLC Number:

U260.33

Cao Shihao, Li Xu, Wen Lianghua, Jiang Xiaoyu. Fatigue Analysis of Wheel/Rail Contact Based on ANSYS[J]. Journal of Chongqing Jiaotong University(Natural Science), 2015, 34(4): 171-175.

曹世豪，李煦，文良华，江晓禹. 基于ANSYS的轮轨接触疲劳分析[J]. 重庆交通大学学报（自然科学版）, 2015, 34(4): 171-175.

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