Abstract
This work deals with the development of a new approach to a high-cycle fatigue lifetime prediction, which is made in the stochastic framework and allows taking into account the natural degradation (aging) of material properties. Degradation of properties has been modeled as a process of the reduction of fatigue (endurance) limit. Kinetics of damage accumulation is introduced in the context of the effective stress concept. Mathematical expectation, correlation function and the continuum damage parameter variance have been obtained as functions of time. Analysis of the influence of natural aging process on statistical parameters of damage accumulation as well as on the lifetime has been carried out.
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