Abstract
It is important to obtain the stress frequency distribution caused by service loads in order to estimate the fatigue life of welds on vehicle truck frames. Although this distribution by service load is obtainable from vehicle running tests, it is difficult to estimate it at the design stage. Accordingly, we examined the characteristics of stress frequency obtained from past running test data, and analyzed them in conjunction with analysis on the effects of running conditions, including distance, speed and payload. The study results will be used to estimate stress frequency distribution at the stages of design or modification in train line with operating conditions.
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