Title: Estimation of the fatigue strength distribution of 50~# railway axle steel based on the fatigue failure data of a small sample
Abstract: In order to evaluate the fatigue reliability of 50# railway axle steel,in this study the very high cycle fatigue test was carried out a four-axis cantilever-type rotary bending fatigue machine using in open environment at room temperature.A statistical method for decision of fatigue strength distribution of 50# railway axle steel is proposed based on the data obtained from the test.This method is based on endurance strength data of a small sample.The procedure of the proposed method is as follows:(1i)t is assumed that the distributions of fatigue strength at different number of cycles are approximately identical;(2) the number of cycles N0 corresponding to the keen point obtained from mean S-N curve is determined;(3)based on linear theory of cumulative damage,the stress data in endurance strength region are transformed into one group of stress corresponding to N0;(4)the fatigue strength distribution is estimated by the group of stress corresponding to N0.The result of the fatigue limit distribution obtained from the proposed method is in good accordance with the scatter degree of test data in fatigue limit region.
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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