A macro-constitutive model of polycrystalline NiTi SMAs including tensile–compressive asymmetry and torsion pseudoelastic behaviors
A macro-constitutive model of polycrystalline NiTi SMAs including tensile–compressive asymmetry and torsion pseudoelastic behaviors
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DOI：
10.1016/j.ijengsci.2010.04.002
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发表时间：
2010-12
影响因子：
6.6
通讯作者：
Yuping Zhu;Guansuo Dui
中科院分区：
文献类型：
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作者：
Yuping Zhu;Guansuo Dui
实验结果表明，材料成分和加载方式对形状记忆合金的性能有显著影响。为了全面研究加载模式对NiTi试样伪弹性行为的影响，对相同材料组分的NiTi试样进行了纯拉伸、压缩和扭转试验。根据实验观察到的现象，提出了考虑多晶NiTi sma拉伸压缩不对称性的宏观本构模型。在本研究中，宏观应变考虑了弹性应变、宏观相变应变和宏观温度应变。马氏体的体积分数受体系吉布斯自由能的降低所控制。在该模型中，用于确定模型参数的实验数据较少。该模型不仅简单，而且适合工程应用。理论结果与实验数据吻合较好。
Experimental results show that material component and loading modes may affect the properties of shape-memory alloys (SMAs) markedly. In order to investigate the influence of loading modes on pseudoelasticity behaviors fully, some experiments of NiTi specimens under pure tension, compression and torsion with the same material component are investigated. In terms of the phenomena observed in experiments, a macro-constitutive model is presented for considering the tension–compression asymmetry of polycrystalline NiTi SMAs. In this study, the macroscopic strain is taken account of elastic strain, macro-transformation strain and macro-temperature strain. The volume fraction of martensite is governed by the reduction in Gibbs’ free energy of the system. In the present model, the fewer experimental data which are used to determine model parameters are needed. The model is not only simple but also fit for using in engineering. The theoretical results are found to be in good agreement with experimental data.