A Constitutive Model for Superelastic Shape Memory Alloys Considering the Influence of Strain Rate

Mathematical Problems in Engineering. 2013;2013 DOI 10.1155/2013/248671


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Journal Title: Mathematical Problems in Engineering

ISSN: 1024-123X (Print); 1563-5147 (Online)

Publisher: Hindawi Publishing Corporation

LCC Subject Category: Technology: Engineering (General). Civil engineering (General) | Science: Mathematics

Country of publisher: Egypt

Language of fulltext: English

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Hui Qian (School of Civil Engineering, Zhengzhou University, Zhengzhou 450000, China)
Hongnan Li (School of Civil Engineering, Zhengzhou University, Zhengzhou 450000, China)
Gangbing Song (Department of Mechanical Engineering, University of Houston, Houston, TX 77204-4006, USA)
Wei Guo (School of Civil Engineering, Central South University, Changsha, China)


Blind peer review

Editorial Board

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Time From Submission to Publication: 26 weeks


Abstract | Full Text

Shape memory alloys (SMAs) are a relatively new class of functional materials, exhibiting special thermomechanical behaviors, such as shape memory effect and superelasticity, which enable their applications in seismic engineering as energy dissipation devices. This paper investigates the properties of superelastic NiTi shape memory alloys, emphasizing the influence of strain rate on superelastic behavior under various strain amplitudes by cyclic tensile tests. A novel constitutive equation based on Graesser and Cozzarelli’s model is proposed to describe the strain-rate-dependent hysteretic behavior of superelastic SMAs at different strain levels. A stress variable including the influence of strain rate is introduced into Graesser and Cozzarelli’s model. To verify the effectiveness of the proposed constitutive equation, experiments on superelastic NiTi wires with different strain rates and strain levels are conducted. Numerical simulation results based on the proposed constitutive equation and experimental results are in good agreement. The findings in this paper will assist the future design of superelastic SMA-based energy dissipation devices for seismic protection of structures.