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Résumé. - Abstract. -The knowledge of dissipative and non dissipative phenomena associated to quasi-static déformation processes, is a fundamental supplementary asset for determination of thermomechanical behaviour law. On depicts, in this paper, an experimental set-up, using infra-red technics, which allows to observe thermal and energetical phenomena during sample déformation. After restating the definition of the energy balance, in case of elastic-plastic materials, the relationship between the dissipation (or the stored energy of cold working) and the hardening state variables are recalled. The dissipation is continuously evaluated during monotonic tensile test. Numerized maps of surface temperature are used. The experimental arrangement is described ; then the physical model, which allows to relate the dissipation to the temperature signals, and the calibration method are successively introduced. Results on several materials are shown and their incidence on the behaviour law is succinctly mentioned.Revue Phys. Appl. 24 (1989) 215-225 FÉVRIER 1989, Classification Physics Abstracts
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