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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Vydáno v:Materials Research Express Ročník 3; číslo 7; s. 76502 - 76511
Hlavní autoři: Shi, Xiaohong, Zeng, Xiangguo, Chen, Huayan
Médium: Journal Article
Jazyk:angličtina
Vydáno: IOP Publishing 22.07.2016
Témata:
constitutive model
high strain rate
NiTi shape memory alloy
semi-implicit stress integration algorithm
ISSN:2053-1591, 2053-1591
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Shrnutí: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.
Bibliografie:MRX-102214
ISSN:2053-1591
2053-1591
DOI:10.1088/2053-1591/3/7/076502