Probabilistic framework for multiaxial LCF assessment under material variability

Abstract The influence of material variability upon the multiaxial LCF assessment of engineering components is missing for a comprehensive description. In this paper, a probabilistic framework is established for multiaxial LCF assessment of notched components by using the Chaboche plasticity model and Fatemi-Socie criterion. Simulations from experimental results of two steels reveal that the scatter in fatigue lives can be well described by quantifying the variability of four material parameters { σ f ′ , e f ′ , b , c } . A procedure for choosing the safety factor for fatigue design has been derived by using first order approximation.

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