Fatigue life prediction based on the rainflow cycle counting method for the end beam of a freight car bogie |
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| Authors: | S H Baek S S Cho W S Joo |
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| Institution: | (1) School of Mechanical Engineering, Dong-A University, Busan, 604-714, Korea;(2) Department of Vehicle Engineering, Kangwon National University, Gangwon, 245-711, Korea;(3) Department of Mechanical Engineering, Dong-A University, Busan, 604-714, Korea |
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| Abstract: | This paper presents a system for treating of the actual measured data for load histories. The approach consists of two steps:
stress analysis and fatigue damage prediction. Finite element analysis is conducted for the component in question to obtain
detailed stress-strain responses. A significant number of failures occurred in a brake end beam which led to economic losses
and disruption of service. The cracks appeared to be fatigue cracks caused by the dynamic load produced in the loaded bogie
frame. Strain gauge data were analyzed, and fatigue cycles were calculated from this data. Rainflow cycle counting was used
to estimate cumulative damage of the end beam under in-service loading conditions. The fatigue life calculated with the rainflow
cycle counting method, the P-S-N curve, and the modified Miner’s rule agreed well with actual fatigue life within an error
range of 2.7%~31%. |
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| Keywords: | Fatigue life prediction Rainflow cycle counting Cumulative damage Miner’ s rule P-S-N curve Censored strain data |
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