Superelastic shape memory alloys are a unique class of smart materials that can recover up to 6% strains. Due to their appealing properties such as high energy dissipation and corrosion resistance, several researchers have assessed the use of such materials in numerous applications ranging from biomedical to civil engineering. This article investigates the thermomechanical and electrical response of a NiTi shape memory alloy cable with a complex configuration subjected to cyclic loading of various strain amplitudes ranging from 3% to 7%. The cable consists of several multi-layered strands with a cumulative outer diameter of 5.5 mm. The thermomechanical results indicate a good correlation of the change in cable temperature with the applied strains and maximum stresses. The temperature history can be used to map the degradation pattern of the shape memory alloy cable. In addition, due to the complex geometry of the cable, the global electrical resistance change does not predict the strain/stress state of the cable; however, it can be used to predict the onset of phase transformations.

中文翻译：

---

超弹性镍钛形状记忆合金电缆的热机械和电响应

超弹性形状记忆合金是一类独特的智能材料，可恢复高达 6% 的应变。由于其吸引人的特性，例如高能量耗散和耐腐蚀性，一些研究人员已经评估了这些材料在从生物医学到土木工程的众多应用中的使用。本文研究了具有复杂配置的 NiTi 形状记忆合金电缆在承受 3% 到 7% 的各种应变幅度的循环加载时的热机械和电响应。电缆由多个多层绞合线组成，累积外径为 5.5 毫米。热机械结果表明电缆温度的变化与施加的应变和最大应力之间存在良好的相关性。温度历史可用于绘制形状记忆合金电缆的退化模式。此外，由于电缆的复杂几何形状，整体电阻变化并不能预测电缆的应变/应力状态；然而，它可以用来预测相变的开始。