NiTi形状记忆合金的性能测试与表征

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材料工程 ›› 2003, Vol. 0 ›› Issue (8) : 28-32.

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测试技术

NiTi形状记忆合金的性能测试与表征

胡自力, 熊克, 王鑫伟

作者信息 +

Property Evaluation of NiTi Shape Memory Alloy

HU Zi-li, XIONG-Ke, WANG Xin-wei

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文章历史 +

摘要

从NiTi形状记忆合金(Shape MemoryAlloy,SMA)性能评价和智能结构研究的角度出发,分析了SMA的应力、应变、温度、电阻以及相变之间的关系.通过分阶段和不同变量组合,对SMA的力学、热学和电学特性进行了实验研究.建立了拉伸状态下形状各异的应力-应变曲线通用物理模型,并进行了数值模拟.结果表明:SMA在马氏体相变,特别是R相变时出现一系列物理、力学性质的异常变化,其本构关系呈现高度非线性;数值模拟结果与实验结果较好地吻合;采用应力、应变、电阻、温度四坐标同步测量是对SMA性能评价的重要方法和有效手段.

Abstract

The important relationships among stress, strain, temperature, electrical resistance and phase transformation of NiTi shape memory alloy (SMA) was synthetically tested and analyzed by various combinations of parameters. A physical model was established to describe the experimental stressstrain curves of SMA, and numerical simulations were performed. Several testing methods were proposed for the need of material evaluations and smart structure developments. Experimental results show that a series of unusual changes on physical and mechanical properties of SMA occur when martensitic, especially R(rhombohedral), phase transformation emerge, and that the constitutive relationship of SMA is highly non-linear. Numerical results are in good agreement with experimental dataIt is an important and effective method to measure stress, strain, electrical resistance and temperature synthetically for studying properties and structural variations of SMA.

导出引用

胡自力, 熊克, 王鑫伟. NiTi形状记忆合金的性能测试与表征[J]. 材料工程, 2003, 0(8): 28-32

HU Zi-li, XIONG-Ke, WANG Xin-wei. Property Evaluation of NiTi Shape Memory Alloy[J]. Journal of Materials Engineering, 2003, 0(8): 28-32

中图分类号： TB381

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