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Comportement et cinétique de transformation martensitique sous sollicitation multiaxiale des matériaux métastables

Abstract : Phase transformation considerably influences the thermomechanical properties of metastable materials. This is reflected in the numerical model that simulates the behavior of these materials for the calculation codes and require experiments.Thus, the present work concerns the characterization of the axial and multi-axial behavior of two iTRIP steels, 301L steel and 304L steel in addition to a shape memory alloy based on CuAlBe. This characterization is coupled with monitoring of phase transformation kinetics through the measurement of the electrical resistance.The first chapter is a bibliographic study of the two classes of metastable materials mentioned above as well as the phase transformation phenomenon and its characterization techniques. The second chapter deals with uniaxial thermomechanical tests on a steel iTRIP to validate the phase assay. The multiaxial thermomechanical testing performed on specimens tubular steel 304L iTrip will be presented.The third chapter is devoted to uniaxial tests performed on CuAlBe spicemens and realization phase doping in a three-phase case. Also, the validation of the assumption of linearity between the martensite volume fraction and the equivalent transformation strain in the case of proportional and non-proportional loading is done.
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  • HAL Id : tel-02360083, version 1

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Mohamed Lakrit. Comportement et cinétique de transformation martensitique sous sollicitation multiaxiale des matériaux métastables. Mécanique des matériaux [physics.class-ph]. Université de Bretagne occidentale - Brest, 2016. Français. ⟨NNT : 2016BRES0021⟩. ⟨tel-02360083⟩

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