Fatigue life prediction by statistical approach under constant amplitude loading |
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Authors: | Ouk Sub Lee |
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Affiliation: | (1) Department of Mechanical Engineering, Inha University, 402-751 Inchon, Korea |
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Abstract: | In general, the experimental data of fatigue crack growth rates scatter very much even under identical experimental condition
such as a constant amplitude loading condition. It is, thus, essential to take into account the data scatter of crack growth
rates by using statistical approach for a reliable fatigue crack, propagation analysis. In this study, fatigue crack propagation
tests were conducted on a 1.02 mm-thick 2024-T3 aluminum alloy under a constant amplitude loading condition. The distribution
of the fatigue crack propagation life is estimated by using the stochastic Markov chain model based on a modified Paris-Erdogan
equation to consider the variability of the fatigue crack growth. The fatigue lives estimated by using the Markov chain model
are found to be agreed well with the experimental results. |
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Keywords: | Markov Chain Fatigue Life DC (Duty Cycle) CD (Cumulative Damage) A Modified Paris-Erdogan Equation Fatigue Crack Prowth Rate Fatigue Crack Propagation Life Aluminum Alloy Data Scatter |
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