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Theses

Etude en fatigue thermomécanique sur un acier inoxydable : réalisation d'essais et prévision de la durée de vie du matériau

Abstract : Low cycle thermal mechanical fatigue tests were carried out on 316L stainless steel specimens. These tests were automatically controlled by a micro computer which permits to realize the superposition of thermal and mechanical cycles with the waveforms of out-of-phase and in-phase. Two temperature ranges (250° C-500°C and 250°C-650°C) of thermal cycling were controlled with the same waveform as the mechanical cycling. Both types of tests (in-phase and out-of-phase) were conducted at the same strain rate of 0,0001/s. The total strain range were realized from 1,0% to 2,4%. To predict the lifetime of components submitted to thermal mechanical fatigue, first the stress strain response of the material in stabilized cycles was simulated by a non linear kinematic hardening model. An internal variable was introduced into this model in order to describe the thermal cycling effect. With isothermal fatigue data this kinematic hardening model using three parameters depending on temperature and plastic strain range can correctly yields a very good approximation of hysteresis loop for low cycle thermal mechanical fatigue. To describe the influence of the variable tempetature on damage in thermal mechanical fatigue, a temperature damage factor was introduced. To study the fatigue damage process, a typical stabilized hysteresis loop of thermal mechanical cycling is considered to be the combination of great deal of parts, each of them corresponding to a given temperature, and a linear damage model based on the total strain energy density is supposed. This method using the isothermal fatigue data gives satisfactory results for thermal mechanical fatigue life prediction
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Huiji Shi. Etude en fatigue thermomécanique sur un acier inoxydable : réalisation d'essais et prévision de la durée de vie du matériau. Sciences de l'ingénieur [physics]. Université Paul Verlaine - Metz, 1992. Français. ⟨NNT : 1992METZ014S⟩. ⟨tel-01775973⟩

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