Abstract
The drawing or rolling process endows polycrystal shape memory alloy with a crystallographic texture, which can result in macroscopic anisotropy. The main purpose of this work is to develop a constitutive model to predict the thermomechanical behavior of shape memory alloy sheets, which accounts for the crystallographic texture. The total macroscopic strain is decomposed into elastic strain and macro-transformation strain under isothermal condition. Considering the transformation strain in local grains and the orientation distribution function of crystallographic texture, the macro-transformation strain and the effective elastic modulus of textured polycrystal shape memory alloy are developed by using tensor expressions. The kinetic equation is established to calculate the volume fraction of the martensite transformation under given stress. Furthermore, the Hill’s quadratic model is developed for anisotropic transformation hardening of textured SMA sheets. All the calculation results are in good agreement with experimental data, which show that the present model can accurately describe the macro-anisotropic behaviors of textured shape memory alloy sheets.
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Project supported by the National Natural Science Foundation of China (Nos. 11272136, 10902111, 10772021 and 10972027) and the Foundation of Jiangsu University (No. 11JDG066).
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Zhu, Y., Wang, Y. & Dui, G. Constitutive Modeling of Rolled Shape Memory Alloy Sheets Taking into Account Pre-Texture and Anisotropic Hardening. Acta Mech. Solida Sin. 27, 181–194 (2014). https://doi.org/10.1016/S0894-9166(14)60028-8
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DOI: https://doi.org/10.1016/S0894-9166(14)60028-8