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7×7构型NiTi形状记忆合金绞线超弹性试验研究
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西安建筑科技大学 土木工程学院

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国家自然科学(52078411), National Natural Science Foundation of China(52078411);陕西省创新能力支撑计划-青年科技新星项目 (2022KJXX-47), Shaanxi Province Innovation Ability Support Program-Youth Science and Technology New Star Project (2022KJXX-47);陕西省教育厅青年创新团队科研计划项目(22JP041), Shaanxi Provincial Department of Education Youth Innovation Team Research Project (22JP041)


Experimental Investigation on Superelasticity of 7×7 NiTi Shape Memory Alloy Cables
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School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an

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    摘要:

    本研究重点探讨了单丝直径为1.0mm的7×7构型超弹性形状记忆合金(SMA)绞线的力学性能,主要关注其回复能力和耗能能力。分析了热处理方案、应变幅值、循环加载、预训练和加载速率对SMA绞线的残余应变、能量耗散、等效粘滞阻尼比、强度和刚度的影响。此外,通过单调拉伸试验比较了SMA绞线与SMA丝材的抗拉强度和极限应变。结果表明,经过400℃下退火10min后,SMA绞线具有出色的超弹性性能,应变回复率达到91.7%。在恒定应变幅值加卸载训练下,SMA绞线的力学性能逐渐趋于稳定,应在工程应用中应予以考虑;通过预训练的方式可以显著提高SMA绞线的回复能力,未经热处理和退火10min的试件在预训练后残余应变分别降低了47%和41%;当加载速率大于5×10-4s-1,SMA绞线的滞回环形态对加载速率的变化不敏感;与SMA丝材相比,SMA绞线具有更好的延性和鲁棒性,适用于大变形情况下提供足够的恢复力;试验结果为SMA绞线的工程应用提供了试验数据支持。

    Abstract:

    This paper centers on examining the mechanical properties of 7×7 configuration superelastic shape memory alloy (SMA) cables, featuring a single wire diameter of 1.0 mm. The primary emphasis is on assessing their recovery capability and energy dissipation capacity. A detailed investigation on the effects of the heat treatment strategy, strain amplitude, cyclic loading, pre-training, and loading rate of the SMA cables on their mechanical performance—residual strain, energy dissipation, equivalent viscous damping ratios, strength, and stiffness—was conducted. Furthermore, the tensile strength and ultimate strain of SMA cables and SMA wire were compared by monotonic tensile test. The results show that the SMA cable has excellent superelasticity after annealing at 400 °C for 10 min, and the strain recovery rate reaches 91.7 %. Under the constant strain amplitude loading and unloading training, the mechanical properties of SMA cable gradually tend to be stable, which should be considered in engineering application. The recovery ability of SMA cable can be significantly improved by pre-training. The residual deformation of specimens without heat treatment and annealed for 10 min is reduced by 47 % and 41 % respectively after pre-training. When the loading rate is greater than 5 × 10-4s-1, the hysteresis loop shape of SMA cable is not sensitive to the change of loading rate. Compared with SMA wire, SMA cable has better ductility and robustness, which is suitable for providing sufficient restoring force in the case of large deformation. The test results provide experimental data support for the engineering application of SMA cables.

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  • 收稿日期: 2023-12-20
  • 最后修改日期: 2024-03-27
  • 录用日期: 2024-04-07
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