对NbTi/Cu超导股线、绞线开展了一系列常温力学特性实验研究,包括准静态加卸载、芯丝裂纹扩展及轴向疲劳。实验发现:超导股线加载过程具有明显的阶段性,经过初始加卸载循环“锻炼”后,残余应变不随卸载应力增加而增加;疲劳前期芯丝内部无裂纹,疲劳后期裂纹呈指数型增长直至最终破坏;绞线杨氏模量、疲劳寿命均与扭转节距有关。疲劳过程中,采用循环周期内耗散能定性评估材料内部损伤程度。 A series of experimental studies on the mechanical properties at room temperature of NbTi / Cu superconducting strands and strands have been carried out, including quasi-static loading and unloading, core crack propagation and axial fatigue. The experimental results show that the loading process of superconducting strands has obvious stage. After initial loading and unloading cycles, the residual strain does not increase with the increase of unloading stress. There is no crack in the inner part of the pre-fatigue core, Growth until eventually destroyed; strand Young’s modulus, fatigue life are related to reverse pitch. During fatigue, dissipative energy in the cycle is used to qualitatively evaluate the degree of internal damage.