STP1211: Thermal-Mechanical Fatigue Lifetime Prediction of an Austenitic Stainless Steel

    Shi, HJ
    Research engineer, and professors, the University of Metz, Metz,

    Robin, C
    Research engineer, and professors, the University of Metz, Metz,

    Pluvinage, G
    Research engineer, and professors, the University of Metz, Metz,

    Pages: 12    Published: Jan 1993


    Abstract

    In-phase and out-of-phase low-cycle thermal-mechanical fatigue tests were carried out on 316L austenitic stainless steel specimens controlled by computer. A nonlinear kinematic hardening model with internal variables was developed to describe the cyclic stress strain behavior of thermal-mechanical fatigue and a very good approximation of the hysteresis loops was obtained by comparing with the experiments. In order to predict the lifetime, a typical stabilized hysteresis loop of thermal-mechanical cycling was considered to be the combination of a great deal of parts at different temperatures. Each part has a different contribution rate of the energy density to the damage by introducing a damage factor depending on the temperature. With isothermal fatigue data an equivalent total strain energy density was deduced as a damage parameter and with which the calculation for thermal-mechanical fatigue lifetime prediction gave satisfactory results corresponding to test data.

    Keywords:

    thermal-mechanical fatigue, kinematic hardening, total strain energy density, lifetime prediction, damage, 316L steel


    Paper ID: STP15080S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP15080S


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