Modeling Permanent Deformations of Superelastic and Shape Memory Materials

Journal of Functional Biomaterials

Marco Fabrizio Urbano¹  Ferdinando Auricchio²  Tony Anson³ 

[1] SAES Getters S.p.A., v.le Italia, 77, 20020 Lainate (MI), Italy;Università di Pavia, Via Ferrata 9, 27100 Pavia, Italy; E-Mail:;id="af1-jfb-06-00398">1SAES Getters S.p.A., v.le Italia, 77, 20020 Lainate (MI), Ita

关键词: superelasticity;    shape memory alloys;    constitutive modeling;    elastic modulus;    functional fatigue;   

DOI  :  10.3390/jfb6020398

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.