Fatigue evaluation for high-speed railway axles with surface scratch. (June 2019)

• Record Type: Journal Article
• Authors: Xu, Z.W.; Wu, S.C.; Wang, X.S.
• Is Part Of: International journal of fatigue. Volume 123(2019)
• Page Start: 79
• Page End: 86
• Publication Date: 2019-06
• Subjects: High-speed railway axle -- Surface scratch -- Kitagawa-Takahashi diagram -- Fatigue strength -- Murakami equation; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2019.02.016
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: The distribution characteristics of surface scratch depths for EA4T axles were carefully detected. The distribution of scratch depths can be described by Gaussian distribution method. The critical scratch depth ( x 0 ) for EA4T steel is about 10 μm. A hoop crack initiation and propagation region can be defined as an effective result of surface scratches. A fatigue evaluation method of high-speed railway axles is proposed based on 3D Kitagawa-Takahashi diagram. Abstract: With the development of high-speed railway, researchers pay much attention to the fatigue damage evaluation of critical components. For high-speed railway axles, surface scratches are defined as a main defect. The maximum scratch depth was detected carefully about 128 μm based on EA4T axles. To reveal the negative effect of surface scratches on fatigue performance of EA4T steel, rotating bending fatigue texts were carried out. The results indicated that the critical scratch depth ( x 0 ) of EA4T steel is about 10 μm. Less than 10 μm, surface scratch has no obvious effect on fatigue performance of EA4T steel. In addition, to evaluate the operation safety of scratch-affected axles, the geometry and loading type effects were considered. The fatigue limit curve of scratch-affected axles was estimated by Murakami equation. A fatigue estimation method of scratch-affected axles was proposed based on three-dimensional Kitagawa-Takahashi diagram that can be used in the maintenance and evaluation of damaged high-speed railway axles.