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Journal Articles Probabilistic Engineering Mechanics Year : 2023

Probabilistic formulation of Miner's rule and application to structural fatigue

Abstract

The standard stress-based approach to fatigue is based on the use of S-N curves. They are obtained by applying cyclic loading of constant amplitude $S$ to identical and standardised specimens until they fail. The S-N curves actually depend on a reference probability $p$: for a given cycle amplitude $S$, they provide the number of cycles at which a proportion $p$ of specimens have failed. Based on the S-N curves, Miner's rule is next used to predict the number of cycles to failure of a specimen subjected to cyclic loading with variable amplitude. In this article, we present a probabilistic formulation of Miner's rule, which is based on the introduction of the notion of health of a specimen. We show the consistency of that new formulation with the standard approaches, thereby providing a precise probabilistic interpretation of these. Explicit formulas are derived in the case of the Weibull--Basquin model. We next turn to the case of a complete mechanical structure: taking into account size effects, and using the weakest link principle, we establish formulas for the survival probability of the structure. We illustrate our results by numerical simulations on a I-steel beam, for which we compute survival probabilities and density of failure point. We also show how to efficiently approximate these quantities using the Laplace method.

Dates and versions

hal-04050871 , version 1 (29-03-2023)

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Francois-Baptiste Cartiaux, Alain Ehrlacher, Frédéric Legoll, Alex Libal, Julien Reygner. Probabilistic formulation of Miner's rule and application to structural fatigue. Probabilistic Engineering Mechanics, 2023, 74, pp.103500. ⟨10.1016/j.probengmech.2023.103500⟩. ⟨hal-04050871⟩
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