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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

Comparison of simulated and experimental results for temperature loops under uniaxial tensile load at different tensile stresses. (a) 400 MPa; (b) 500 MPa.
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jfb-06-00398-f003: Comparison of simulated and experimental results for temperature loops under uniaxial tensile load at different tensile stresses. (a) 400 MPa; (b) 500 MPa.

Mentions: The adopted parameters are not obtained with a rigorous fitting procedure but provide a reasonable matching with experimental results. A comparison is shown in Figure 2 and Figure 3.


Modeling Permanent Deformations of Superelastic and Shape Memory Materials.

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

Comparison of simulated and experimental results for temperature loops under uniaxial tensile load at different tensile stresses. (a) 400 MPa; (b) 500 MPa.
© Copyright Policy
Related In: Results  -  Collection

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

jfb-06-00398-f003: Comparison of simulated and experimental results for temperature loops under uniaxial tensile load at different tensile stresses. (a) 400 MPa; (b) 500 MPa.
Mentions: The adopted parameters are not obtained with a rigorous fitting procedure but provide a reasonable matching with experimental results. A comparison is shown in Figure 2 and Figure 3.

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