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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Bibliographic Details
Published in:Materials Research Express Vol. 3; no. 7; pp. 76502 - 76511
Main Authors: Shi, Xiaohong, Zeng, Xiangguo, Chen, Huayan
Format: Journal Article
Language:English
Published: IOP Publishing 22.07.2016
Subjects:
constitutive model
high strain rate
NiTi shape memory alloy
semi-implicit stress integration algorithm
ISSN:2053-1591, 2053-1591
Online Access:Get full text
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Summary: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.
Bibliography:MRX-102214
ISSN:2053-1591
2053-1591
DOI:10.1088/2053-1591/3/7/076502