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Modeling Permanent Deformations of Superelastic and Shape Memory Materials.

Urbano MF, Auricchio F - J Funct Biomater (2015)

Bottom Line: In this paper we propose a modification of the polycrystalline shape memory alloy constitutive model originally proposed by Souza.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.

View Article: PubMed Central - PubMed

Affiliation: SAES 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.

No MeSH data available.


Related in: MedlinePlus

Thermodynamic force position at the end of the tension load step at 50 °C. Points 1, 3 and 5 refer to the first, second and third cycle respectively.
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jfb-06-00398-f004: Thermodynamic force position at the end of the tension load step at 50 °C. Points 1, 3 and 5 refer to the first, second and third cycle respectively.

Mentions: Several loading conditions are provided. In order to understand the internal variable interplay, we start analyzing a stress strain test at 50 °C up to 9% deformation (Figure 2b), with the help of Figure 4, where the thermodynamic force status is represented.


Modeling Permanent Deformations of Superelastic and Shape Memory Materials.

Urbano MF, Auricchio F - J Funct Biomater (2015)

Thermodynamic force position at the end of the tension load step at 50 °C. Points 1, 3 and 5 refer to the first, second and third cycle respectively.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4493520&req=5

jfb-06-00398-f004: Thermodynamic force position at the end of the tension load step at 50 °C. Points 1, 3 and 5 refer to the first, second and third cycle respectively.
Mentions: Several loading conditions are provided. In order to understand the internal variable interplay, we start analyzing a stress strain test at 50 °C up to 9% deformation (Figure 2b), with the help of Figure 4, where the thermodynamic force status is represented.

Bottom Line: In this paper we propose a modification of the polycrystalline shape memory alloy constitutive model originally proposed by Souza.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.

View Article: PubMed Central - PubMed

Affiliation: SAES 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.

No MeSH data available.


Related in: MedlinePlus