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<p>Shape memory alloys (SMAs) are promising smart actuators, offering advantages such as the shape memory effect (SME), large deformation capability, and high power-to-weight ratio. This study investigates the driving and resistance characteristics of 25&#xa0;μm-diameter NiTi SMA ultrafine wires under varying conditions of voltage, training cycles, and pre-strain. Experimental data were used to establish a resistance thermal driving model through curve fitting. The results reveal that SMA wires achieve rapid actuation with a response time as low as 0.3&#xa0;s, where higher voltages further reduce response time. Stable performance is attained after 15–20 thermal–mechanical training cycles. Additionally, applying optimal pre-strain enhances recovery force and driving displacement, while minimizing hysteresis in the resistance thermal driving relationship. These findings provide valuable insights and a robust experimental foundation for the development of ultrafine NiTi SMA-based actuation and sensing systems.</p>

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Thermomechanical behavior and resistance sensing properties of ultrafine NiTi shape memory alloy wires

  • 期刊论文

  • 发表日期：

    2025年2月22日

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  • Hui Qian,
  • Yanyan Du,
  • Zongao Li,
  • Weiyi Chen,
  • Yonglin Ren,
  • Boheng Yang,
  • Rende Wang

摘要

Shape memory alloys (SMAs) are promising smart actuators, offering advantages such as the shape memory effect (SME), large deformation capability, and high power-to-weight ratio. This study investigates the driving and resistance characteristics of 25 μm-diameter NiTi SMA ultrafine wires under varying conditions of voltage, training cycles, and pre-strain. Experimental data were used to establish a resistance thermal driving model through curve fitting. The results reveal that SMA wires achieve rapid actuation with a response time as low as 0.3 s, where higher voltages further reduce response time. Stable performance is attained after 15–20 thermal–mechanical training cycles. Additionally, applying optimal pre-strain enhances recovery force and driving displacement, while minimizing hysteresis in the resistance thermal driving relationship. These findings provide valuable insights and a robust experimental foundation for the development of ultrafine NiTi SMA-based actuation and sensing systems.