Influence of fatigue–life data modelling on the estimated reliability of a structure subjected to a constant-amplitude loading

Jernej Klemenc

Reliability Engineering and System Safety, 2015, vol. 142, issue C, 238-247

Abstract: This article describes how a selected material’s fatigue–life-curve model influences the calculated reliability of a structure subjected to a dynamic loading. A uni-axially loaded structural beam with a fully-reversal constant loading amplitude was considered. The reliability for a certain number of cycles-to-failure was calculated as a cross-section of the probability distributions representing the load–amplitude scatter and the scatter of the material’s fatigue–life curve. The probability density function (PDF) of the loading amplitude was modelled by a uniform and a Gaussian PDF. The scattered fatigue–life curve was modelled by a conditional two-parametric Weibull’s PDF. Its parameters were estimated using two procedures: (i) a two-phase procedure and (ii) a direct procedure. Following the two-phase procedure a conditional PDF of the number of cycles-to-failure was estimated first and then converted into a corresponding conditional PDF of the stress amplitudes. In the direct procedure the conditional PDF of the stress amplitudes was modelled directly from the fatigue–life data. The two procedures were tested on 12 sets of simulated fatigue–life data and a set of experimental fatigue–life data. The two fatigue–life-curve models for the experimental data set were applied for calculating the reliability for the selected structural beam.

Keywords: Reliability; Uni-axial constant-amplitude loading; Fatigue–life curves with scatter; P–P plots; S420MC steel (search for similar items in EconPapers)
Date: 2015
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:reensy:v:142:y:2015:i:c:p:238-247

DOI: 10.1016/j.ress.2015.05.026

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