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International Journal of Automotive Technology > Volume 9(1); 2008 > Article
International Journal of Automotive Technology 2008;9(1): 95-111.
FATIGUE LIFE PREDICTION BASED ON THE RAINFLOW CYCLE COUNTING METHOD FOR THE END BEAM OF A FREIGHT CAR BOGIE
S. H. BAEK1, S. S. CHO2, W. S. JOO1
1Dong-A University
2Kangwon National University
ABSTRACT
The focus of this paper has been to present a system for treatment of the actual measured data of load histories. The approach consists of two steps: stress analysis and fatigue damage prediction. Finite element analysis is conducted for the component to obtain the detailed stress-strain responses. A significant number of failures have occurred in brake end beam which led to economical loss and disruption of services. The cracks appeared to be fatigue cracks due to the dynamic load produced in the loaded bogie frame. Strain gauge data were analyzed and from this data fatigue cycles were calculated. Rainflow cycle counting was used to estimate cumulative damage of end beam under in-service loading condition. The fatigue life calculated with rainflow cycle counting method, P-S-N curve, and modified Miner’s rule agreed well with actual fatigue life within error range of 2.7 %~31 %.
Key Words: Fatigue Life Prediction, Rainflow Cycle Counting, Cumulative Damage, Miner’s Rule, P-S-N Curve, Censored Strain Data
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