Multiaxial Shape Memory Effect and Superelasticity

Abstract : The specific behaviour of shape memory alloys (SMA) is due to a martensitic transformation. This transformation consists mainly in a shear without volume change and is activated either by stress or temperature. The superelastic behaviour and the one-way shape memory effect are both due to the partition between austenite and martensite. The superelastic effect is obtained for fully austenitic SMA: loaded up to 5% strain, a sample recovers its initial shape after unloading with a hysteretic loop. The oneway shape memory effect is obtained when a martensitic SMA, plastically deformed, recovers its initial shape by simple heating. Superelasticity and one-way shape memory effect are useful for several three-dimensional applications. Despite all these phenomena are well known and modelled in 1D, the 3D behaviour, and especially the one-way shape memory effect, remains quite unexplored. Actually, the development of complex 3D applications requires time-consuming iterations and expensive prototypes. Predictive phenomenological models are consequently crucial objectives for the design and dimensioning of SMA structures. Therefore, a series of 2D proportional and non-proportional, isothermal and non-isothermal tests have been performed. This database will be used to build a phenomenological model within the framework of irreversible processes.
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Contributor : Karine Lavernhe Taillard <>
Submitted on : Thursday, September 17, 2009 - 11:45:52 AM
Last modification on : Friday, May 17, 2019 - 1:23:50 AM
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Karine Lavernhe Taillard, Sylvain Calloch, Shabnam Arbab-Chirani, Christian Lexcellent. Multiaxial Shape Memory Effect and Superelasticity. Strain, Wiley-Blackwell, 2009, 45 (1), pp.77-84. ⟨10.1111/j.1475-1305.2008.00528.x⟩. ⟨hal-00417908⟩



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