Journal
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
Volume 37, Issue 1, Pages 85-94Publisher
WILEY
DOI: 10.1111/ffe.12087
Keywords
fatigue; weibull distribution; lognormal distribution; step-stress; maximum likelihood estimation; evolutionary computation; analysis of residuals
Funding
- Fundacao de Amparo a Pesquisa do Estado de Minas Gerais
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This paper introduces a numerical model to estimate fatigue life under step-stress conditions, using the Weibull and lognormal distributions. The maximum likelihood method was used to estimate the free parameters of the distributions. The model was fitted to an experimental data on fatigue life in the specimens of steel SAE 8620, by using evolutionary computation to optimize the likelihood function. Results are reported on the values of the parameters and their confidence interval. Also, a validation of the model is discussed using analysis of residuals.
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