Modeling Permanent Deformations of Superelastic and Shape Memory Materials
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Updated: Apr 8, 2026

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
Published on: May 2, 2016
Marco Fabrizio Urbano1, Ferdinando Auricchio2
1SAES Getters S.p.A., v.le Italia, 77, 20020 Lainate (MI), Italy. marco_urbano@saes-group.com.
Abstract:
In this paper we propose a modification of the polycrystalline shape memory alloy constitutive model originally proposed by Souza. By introducing a transformation strain energy with two different hardening coefficients, we are able to take into account the effect of the martensitic transformation of unfavorably oriented grains occurring after the main plateau. By choosing a proper second hardening coefficient, it is possible to reproduce the correct stress strain behavior of the material after the plateau without the need of introducing a much smaller Young modulus for martensite. The proposed modification is introduced in the model comprising permanent deformation effects. Model results for uniaxial stress tests are compared to experimental results showing good agreement.
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