New method for determining P‐S‐N curves in terms of equivalent fatigue lives

A new method for determining the P‐S‐N curves is proposed by the probabilistic analysis of the mixed samples that are composed of the testing fatigue lives and equivalent fatigue lives. The equivalent fatigue lives at each level are converted from all the testing data at all the testing levels accor...

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Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures 2019-10, Vol.42 (10), p.2340-2353
Main Authors: Bai, Xin, Zhang, Peng, Zhang, Zhen‐jun, Liu, Rui, Zhang, Zhe‐feng
Format: Article
Language:English
Subjects:
Aluminum base alloys
Coefficient of variation
Crack propagation
different sample size
Equivalence
equivalent fatigue life
Fatigue failure
Fatigue life
Fatigue tests
Level (quantity)
Probabilistic analysis
P‐S‐N curves
Statistical analysis
testing efficiency
Testing time
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Summary:A new method for determining the P‐S‐N curves is proposed by the probabilistic analysis of the mixed samples that are composed of the testing fatigue lives and equivalent fatigue lives. The equivalent fatigue lives at each level are converted from all the testing data at all the testing levels according to the equivalent fatigue failure probability, where the life distributions are determined by the medians of logarithmic fatigue lives at respective levels and a unified coefficient of variation. Comparison results of the P‐S‐N curves of 2024‐T3 and A356.0‐T6 alloys with the different methods indicate that the new method can determine the high‐precision P‐S‐N curves with different sample sizes of the S‐N testing data, and can save testing time and improve testing efficiency, especially for the situation of large‐scatter S‐N testing data.
ISSN:8756-758X
1460-2695
DOI:10.1111/ffe.13075