Probabilistic fatigue assessment for high-speed railway axles due to foreign object damages. (December 2018)

• Record Type: Journal Article
• Authors: Wu, S.C.; Xu, Z.W.; Kang, G.Z.; He, W.F.
• Is Part Of: International journal of fatigue. Volume 117(2018)
• Page Start: 90
• Page End: 100
• Publication Date: 2018-12
• Subjects: High-speed railway hollow axles -- Foreign object damage -- Probabilistic fatigue strength -- Kitagawa–Takahashi diagram -- Fracture mechanics; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2018.08.011
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: FOD in railway axle was simulated under two running speeds of 100 m/s and 138 m/s. Fatigue experiment had been conducted with FOD-affected specimens with typical defects. Probabilistic KT was established with the fatigue data of FOD-affected specimens. Abstract: Various surface defects of high-speed railway lightweight hollow axles made of alloy steel were identified carefully for assessing its operation safety and reliability. Three types of foreign object damages (FOD) from compressed-gas gun device were defined as the corner, edge and plane defects in terms of defect geometry, respectively. The fatigue probabilistic S - N ( P - S - N ) curves and fatigue limits were acquired for smoothed and FOD-affected specimens. In view of the variations of size and roughness between the full-scale axles and specimens, the fatigue properties with three defect types were then modified for full-scale axles. The probabilistic Kitagawa–Takahashi diagram widely used for assessing the FOD in aero-engine was well transferred to the damaged railway axles. The fatigue limits of an FOD-affected axle with 95% confidence level and 95% reliability level were evaluated to replace that of smoothed specimens, which was suggested to assess the reliability of a damaged axle at the presence of FOD generated at a prospective higher operation speed.