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 (x0) 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.
Published Version
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