FATIGUE STRENGTH PREDICTION OF RAILWAY AXLE SPECIMEN WITH SURFACE NOTCH BY TCD

XU YouKun; LU LianTao; ZENG DongFang; XU Tian; LI Wei

doi:10.16579/j.issn.1001.9669.2022.04.010

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FATIGUE STRENGTH PREDICTION OF RAILWAY AXLE SPECIMEN WITH SURFACE NOTCH BY TCD

更新时间：2022-09-22

- FATIGUE STRENGTH PREDICTION OF RAILWAY AXLE SPECIMEN WITH SURFACE NOTCH BY TCD
- Journal of Mechanical Strength Vol. 44, Issue 4, Pages: 825-830(2022)
- 作者机构：
  
  1. 西南交通大学牵引动力国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2022.04.010
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XU YouKun, LU LianTao, ZENG DongFang, et al. FATIGUE STRENGTH PREDICTION OF RAILWAY AXLE SPECIMEN WITH SURFACE NOTCH BY TCD. [J]. 44(4):825-830(2022)
DOI：

XU YouKun, LU LianTao, ZENG DongFang, et al. FATIGUE STRENGTH PREDICTION OF RAILWAY AXLE SPECIMEN WITH SURFACE NOTCH BY TCD. [J]. 44(4):825-830(2022) DOI： 10.16579/j.issn.1001.9669.2022.04.010.

摘要

基于临界距离法进行含表面缺陷车轴试样疲劳强度预测研究。使用轴向疲劳试验测试光滑试样、环状V型缺口试样、孔洞缺口试样的疲劳极限，同时也测试了材料在应力比R=-1下的裂纹扩展门槛值。借助有限元计算，基于临界距离法预测含表面缺陷车轴试样的疲劳极限，并采用试验结果验证。研究结果表明，当基于临界距离法预测含表面缺陷车轴试样的疲劳极限时，临界距离法中的点法误差较大，而线法具有更高的预测精度，能够满足工程需求。该方法在对预测表面缺陷车轴疲劳强度上具有重要指导意义。

Abstract

This paper, based on theory of critical distance（TCD）, carried out a research on the fatigue strength prediction of axle specimens with surface notch. The fatigue limit of smooth specimens, specimens with V-shaped surface notch, and specimens with hole-shaped surface notch were tested by axial loading. Meanwhile, the crack growth threshold value when stress ratio R=-1 was tested. The fatigue limit of railway axle specimens with surface notch were predicted by the point method and line method of TCD with the aid of finite element calculation. Calculation results show that, when TCD is used to predict fatigue limit of axle specimens with surface notch, the relative error of point method is larger, and line method has higher prediction accuracy. Line method is able to meet engineering needs and has important guiding significance in predicting the fatigue strength of axles with surface notches.

关键词

缺陷车轴疲劳试验疲劳极限临界距离法

Keywords

NotchRailway axleFatigue testFatigue limitTheory of critical distance TCD

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