Constitutive model for the dynamic response of a NiTi shape memory alloy

In this paper, based on irreversible thermodynamic theory, the Helmholtz free energy function, was selected to deduce both the master equations and evolution equations of the constitutive model of a NiTi alloy under high strain. The Helmholtz free energy function contains the parameters of the refle...

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Veröffentlicht in:Materials Research Express Jg. 3; H. 7; S. 76502 - 76511
Hauptverfasser: Shi, Xiaohong, Zeng, Xiangguo, Chen, Huayan
Format: Journal Article
Sprache:Englisch
Veröffentlicht: IOP Publishing 22.07.2016
Schlagworte:
constitutive model
high strain rate
NiTi shape memory alloy
semi-implicit stress integration algorithm
ISSN:2053-1591, 2053-1591
Online-Zugang:Volltext
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Zusammenfassung:In this paper, based on irreversible thermodynamic theory, the Helmholtz free energy function, was selected to deduce both the master equations and evolution equations of the constitutive model of a NiTi alloy under high strain. The Helmholtz free energy function contains the parameters of the reflecting phase transition and plastic property. The constitutive model for a NiTi alloy was implemented using a semi-implicit stress integration algorithm. Four successive stages can be differentiated and simulated: parent phase elasticity, martensitic phase transition, martensitic elasticity, and dislocation yield. The simulation results are in good agreement with the experimental results.
Bibliographie:MRX-102214
ISSN:2053-1591
2053-1591
DOI:10.1088/2053-1591/3/7/076502