超弹性镍钛SMA绞线力学性能优化试验  

Experimental Optimization on the Mechanical Properties of Superelastic Ni-Ti SMA Cables

作　　者：师亦飞 罗鸿博 夏利科 方园 钱辉[1] SHI Yifei;LUO Hongbo;XIA Like;FANG Yuan;QIAN Hui(School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;Jiangsu Juli Wire Rope Co.,LTD.,Nantong 226010,Jiangsu,China;China Construction Third Bureau Group Co.,LTD.,Wuhan 430075,China)

机构地区：[1]郑州大学土木工程学院,郑州450001 [2]江苏巨力钢丝绳有限公司,江苏南通226010 [3]中建三局集团有限公司,武汉430075

出　　处：《材料导报》2024年第S02期419-425,共7页Materials Reports

基　　金：国家自然科学基金(51978631);中原科技创新领军人才计划(234200510022);河南省高校科技创新团队支持计划(23IRTSTHN006)。

摘　　要：为优化超弹性镍钛SMA绞线的基本力学性能,本工作开展了系统性试验,首次研究了两个重要工艺参数(扭转角与人工时效处理)对1×7镍钛SMA绞线力学性能的影响。为得到更稳定的工作性能和更好的卸载后恢复力,进一步研究了两个使用参数(预张拉应变和循环拉伸训练方案)对SMA绞线的影响。研究结果表明,与扭转角为16.5°的SMA绞线相比,扭转角为6°的SMA绞线展现出更大的初始刚度、屈服强度、峰值应力、较好的耗能能力和自复位能力,且能较早发生马氏体硬化(能使结构在极限状态下具有显著的变形耗能能力,同时增加其刚度,防止结构的过度地震响应)。人工时效处理降低了SMA绞线的强度,但适当的人工时效处理提高了SMA绞线的耗能能力和自复位能力。另一方面,适当的训练和预张拉措施明显提高了循环拉伸响应的稳定性和卸载后的恢复力。In order to optimize the fundamental mechanical properties of superelastic Ni-Ti SMA cables,a systematic experimental study was conducted for the first time to investigate the effects of two crucial process parameters,namely torsion angle and artificial aging treatment,on its mechanical behavior.Additionally,an investigation was carried out to explore the impact of two parameters,pre-tension and training treatment,on enhancing the stability and resilience of 1×7 SMA cables after unloading.The results demonstrate that compared to a torsion angle of 16.5°,a torsion angle of 6°exhibits superior initial stiffness,yield strength,peak stress as well as enhanced energy dissipation capacity and self-centering ability in addition to earlier occurrence of martensitic hardening thereby preventing excessive seismic response in structures.Artificial aging treatment reduces the strength of SMA cables;however,appropriate artificial aging treatment improves its energy dissipation capacity and self-centering ability.Furthermore,proper training and pre-tensioning measures significantly enhance cyclic tensile response stability along with post-unloading resilience.

关 键 词：形状记忆合金(SMA)绞线 扭转角 人工时效处理 训练 预张拉 

分 类 号：TU352.1[建筑科学—结构工程]