| 宋卿争,郑航*,唐志平.加载路径和温度对NiTi合金相变特性的影响[J].实验力学,2015,30(1):42~50 |
| 加载路径和温度对NiTi合金相变特性的影响 |
| On the Influence of Loading Path and Temperature on Phase Transition Properties of NiTi Alloy |
| 投稿时间：2014-03-24 修订日期：2014-04-22 |
| DOI：10.7520/1001-4888-14-053 |
| 中文关键词: 镍钛合金(NiTi) 准静态 应力-应变曲线 相变临界点 相变临界准则 |
| 英文关键词:NiTi alloy quasi-static state stress-strain curve critical point of phase transition, phase transition criterion |
| 基金项目:国家自然科学基金(11072240)资助 |
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| 中文摘要: |
| 利用MTS装置,对NiTi形状记忆合金在不同加载路径(拉、压、扭以及拉/压-扭比例加载)和不同温度(28~150℃)下的准静态相变行为进行了较系统的实验研究。结果表明,材料呈现明显的伪弹性效应和拉压不对称性。随着温度的升高,相变起始应力逐渐增大,伪弹性效应和拉压不对称性逐渐减弱。当温度达到一定阈值时,拉压不对称性消失,材料基本呈现弹塑性状态。通过实验曲线确定了NiTi合金的相变临界参数,在σ-τ应力空间中对三种常用宏观相变临界准则进行了讨论,比较了它们各自的适用性。 |
| 英文摘要: |
| Systematical experimental study of NiTi shape memory alloy quasi-static phase transition behavior was carried out under different loading path conditions (uniaxial compression and tension, pure torsion and proportional tension/compression-torsion) and at different temperatures ranging from 28℃ to 150℃, based on MTS equipment. Experimental results show that the material exhibits apparent pseudo-elastic effect and tension-compression asymmetry. As the temperature increases, the initial phase transition stress increased gradually, meanwhile, the pseudo-elastic effect and tension-compression asymmetry weaken gradually. When the temperature reaches a certain threshold, the tension-compression asymmetry disappears; NiTi alloy basically presents elastic-plastic behavior. NiTi alloy phase transition critical parameters are determined based on experimental curves. In σ-τ stress plane, three macroscopic phase transition criterions in common use are discussed, and their respective applicability is compared. |
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