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J. Funct. Biomater. 2015, 6(2), 398-406; doi:10.3390/jfb6020398

Modeling Permanent Deformations of Superelastic and Shape Memory Materials

1
SAES Getters S.p.A., v.le Italia, 77, 20020 Lainate (MI), Italy
2
Università di Pavia, Via Ferrata 9, 27100 Pavia, Italy
*
Author to whom correspondence should be addressed.
Academic Editors: Tony Anson and Lorenza Petrini
Received: 1 April 2015 / Revised: 25 May 2015 / Accepted: 28 May 2015 / Published: 11 June 2015
(This article belongs to the Special Issue Biomedical Applications of Shape Memory Alloys)
View Full-Text   |   Download PDF [999 KB, uploaded 11 June 2015]   |  

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. View Full-Text
Keywords: superelasticity; shape memory alloys; constitutive modeling; elastic modulus; functional fatigue superelasticity; shape memory alloys; constitutive modeling; elastic modulus; functional fatigue
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Urbano, M.F.; Auricchio, F. Modeling Permanent Deformations of Superelastic and Shape Memory Materials. J. Funct. Biomater. 2015, 6, 398-406.

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