Probabilistic Models for the Long Fatigue Crack Growth Rates of LZ50 Axle Steel

ZHAO Yong-xiang; HE Chao-ming; YANG Bing; HUANG Yu-zhong; GAO Qing; WU Ping-bo

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Article Navigation > Applied Mathematics and Mechanics > 2005 > 26(8): 997-1002

ZHAO Yong-xiang, HE Chao-ming, YANG Bing, HUANG Yu-zhong, GAO Qing, WU Ping-bo. Probabilistic Models for the Long Fatigue Crack Growth Rates of LZ50 Axle Steel[J]. Applied Mathematics and Mechanics, 2005, 26(8): 997-1002.

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Probabilistic Models for the Long Fatigue Crack Growth Rates of LZ50 Axle Steel

State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, P. R. China

Received Date: 2004-05-20
Rev Recd Date: 2005-02-11
Publish Date: 2005-08-15

Abstract

Abstract

Experimental study is performed on the probabilistic models for the long fatigue crack growth rates (da/dN) of LZ50 axle steel. An equation for crack growth rate was derived to consider the trend of stress intensity factor range going down to the threshold and the average stress effect. The probabilistic models were presented on the equation. They consist of the probabilistic da/dN- delta K relations, the confidence-based da/dN-delta K relations, and the probabilistic- and confidence-based da/dN-delta K relations. Efforts were made respectively to characterize the effects of probabilistic assessments due to the scattering regularity of test data, the number of sampling, and both of them. These relations can provide wide selections for practice. Analysis on the test data of LZ50 steel indicates that the present models are available and feasible.
- LZ50 steel,
- long fatigue crack,
- growth rate,
- average stress,
- threshold,
- probabilistic model

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References(9)

References

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