Statistical Analysis of Fatigue Crack Growth Threshold Based on Test Data

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 f...

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Bibliographic Details
Published inApplied Mechanics and Materials Vol. 127; pp. 466 - 470
Main Authors Kong, Guang Ming, Liu, Wen Lin, Mu, Zhi Tao, Jia, Zhong Hu, Yu, Da Zhao
Format Journal Article
LanguageEnglish
Published Zurich Trans Tech Publications Ltd 01.01.2012
Subjects
Fatigue Crack Growth (FCG)
Statistic Analysis
Crack Growth Threshold
Least Square Fitting Method
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Summary: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.
Bibliography:Selected, peer reviewed papers from the 2011 International Academic Conference on Numbers, Intelligence, Manufacturing Technology and Machinery Automation (MAMT 2011), December 24-25, 2011, Wuhan, China
ISBN:9783037852835
3037852836
ISSN:1660-9336
1662-7482
1662-7482
DOI:10.4028/www.scientific.net/AMM.127.466