SEDL / STP / STP1211-EB / STP15080S

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

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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.