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A Study on the Fatigue Crack Evaluation Method of Railway Bogie Frame  

Jun, Hyun-Kyu (한국철도기술연구원, 차륜궤도연구실)
Seo, Jung-Won (한국철도기술연구원, 차륜궤도연구실)
Lee, Dong-Hyong (한국철도기술연구원, 차륜궤도연구실)
Kim, Hyeong-Jin (한국철도기술연구원, 철도구조연구실)
Publication Information
Journal of the Korean Society for Railway / v.12, no.1, 2009 , pp. 16-24 More about this Journal
Abstract
In this study, fatigue crack growth rate of a cracked railway bogie frame under variable amplitude loading is predicted by applying linear elastic fracture mechanics. For this purpose, we find the critical points by reference surveying on cracked railway bogie frames. And we make an effective load history by synthesizing the dynamic load measured from the critical points of railway bogie frame during commercial line operation and the static load calculated from structural analysis. Crack growth analyses are performed at the 3 critical points under the commercial operation loading condition by assuming an initial crack size as 40 mm. and the results are compared with the experimental results from Japanese railway bogie frame crack growth case. From the analysis results, we find that around 500,000 km operating distance is necessary to bring crack growth from the initial crack to unstable crack. And it takes around 3.8 normal operating years. We conclude that it is enough time to detect the crack between normal maintenance period.
Keywords
Fatigue Crack Growth; Fracture Mechanics; Railway Bogie Frame; Stress Intensity Factor; Variable amplitude load;
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