This study concerns the pseudoelasticity of Shape Memory Alloys (SMA). A series of tests under tension-compression-torsion
multiaxial loadings is used to show the validity of a conjecture concerning the relation between the volume
fraction of martensite and the equivalent transformation strain. It is shown that the proportionality between an ad doc
equivalent transformation strain and the volume fraction of martensite is confirmed under multiaxial proportional and
nonproportional loadings.
This study concerns the superelasticity of Shape Memory Alloys (SMA) under cyclic loading. A particular attention is
paid to the evolution of residual strain with number of cycles (like ratcheting in cyclic plasticity of classical metals). To
study the phenomenology of the cyclic behavior and to identify the origin of the developed residual strain a series of
cyclic uniaxial tensile tests on copper based alloys wires has been realized. A macroscopic model describing the cyclic
behavior of superelastic SMA has been proposed. The originalities of the model are, on the one hand, the definition of a
particular elasticity domain when the material is in a two phased state and, on the other hand, an ad hoc kinetic of
transformation strain taking into account a residual strain evolution. The proposed model has been identified using our
experimental data base and has been used to simulate various cyclic multiaxial loadings.
This paper is concerned with the transformation plasticity of a 16MND5 low carbon steel. We present an experimental set-up to perform thermo-mechanical loads under tension-compression- torsion. Some results in the case of constant and non constant applied stresses are shown.
A Digital Image Correlation technique is used to develop and validate a new biaxial compression set-up. Some experimental test have been performed under proportional and nonproportional loading conditions with the experimental set-up. During these test, a particular attention is paid to the appearance and the disappearance of martensite plates during the loading path. By using a long distance microscope with a CCD camera, we show the importance of the mechanical loading path shape on the martensite formation.
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