一种描述形状记忆合金拟弹性变形行为的本构关系
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摘要: 本文给出一种描述形状记忆合金拟弹性变形现象的本构关系,可用于多晶材料在一般应力状态下及单晶材料在单轴应力下的变形情况。该本构关系采用弹性应变与相变应变迭加形式,物理意义明显,形式简洁。对 Cu-Zn-Sn 合金及 Ti-Ni 合金材料的变形行为进行了模拟计算,结果与实验值有较好的吻合。Abstract: A constitutive relation to describe the pseudo-elastic deformation in shape memory alloys is presented in this paper. It is able to describe the deformation of polycry-stalline materials under triaxial stress state as well as of monocrystalline materials under one-dimensional condition. The total strain rate is supposed to be composed of elastic strain rate and transformation strain rate. The deformation behaviour of Cu-Zn-Sn alloy and Ti-Ni alloy is simulated by use of the proposed constitutive relation. T...
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Key words:
- Constitutive relation /
- Shape memory alloys /
- Pseudo-elasticity /
- Phase transformation
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