Statistical Analysis of Fatigue Crack Growth Threshold Based on Test Data

Wen Lin Liu; Guang Ming Kong; Zhi Tao Mu; Zhong Hu Jia; Da Zhao Yu

doi:10.4028/www.scientific.net/AMM.127.466

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 127Statistical Analysis of Fatigue Crack Growth...

Statistical Analysis of Fatigue Crack Growth Threshold Based on Test Data

Abstract:

Statistical analyses on fatigue crack growth threshold under three different stress ratios have been done. By the stratified random sampling theory and the weighted least square fitting method, the test data were analyzed based on Paris crack growth rate formulation. The statistical results of the fatigue crack growth threshold under different stress ratios were obtained by linear fitting method. The results show that the fatigue crack growth threshold is influenced by stress ratio R significantly. In the slow crack growth area near the threshold, the increase of stress ratio leads to the decrease of threshold and the increase of crack growth speed. The threshold results under different stress ratios satisfy the normal distribution.

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Periodical:

Applied Mechanics and Materials (Volume 127)

Pages:

466-470

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.127.466

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Online since:

October 2011

Authors:

Wen Lin Liu, Guang Ming Kong, Zhi Tao Mu, Zhong Hu Jia, Da Zhao Yu

Keywords:

Crack Growth Threshold, Fatigue Crack Growth (FCG), Least Square Fitting Method, Statistic Analysis

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