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Experimental investigation of axial tensile and fatigue behaviors of HTS round strands

Superconductivity 2023年第4期8卷 69-78页

作者： X.Q.Lai J.X.Zuo X.B.Hu T.Zhang J.D.Liu P.Y.Li Southwestern Institute of Physics(SWIP) P.O.Box 432Chengdu 610041PR China Southwestern Institute of Physics ChengduSichuanPR China

For the development of high‐temperature superconducting(HTS)magnet systems of future fusion devices,a novel HTS round strand based on a stacking structure was designed and manufactured using second generation(2G)HTS *** mechanical loads during operation can result in irreversible degradation of the *** axial tension and fatigue loads need particular ***,it is important to investigate the electromechanical behavior of the round strand under various axial tension and cyclic *** this paper,the axial tensile and fatigue tests were conducted at 77 K,self‐*** 95%critical current(I_(c))retention as the criterion,the results of the tensile tests revealed that the average tensile stress and strain were as high as 344 MPa and 0.47%,*** characteristics were also investigated as a function of axial tensile *** significant performance degradation was observed up to 100,000 loading cycles with stress amplitudes ranging from 20 MPa to 200 *** degradation occurs after 16,000 loading cycles with 380 MPa as the maximum ***,the microscopic defects of the round strand samples due to fabrication imperfections and mechanical loading were investigated using metallographic microscope and scanning electron *** results presented in this paper are useful for comprehending and improving the mechanical behaviors of the strand in high‐field and large‐scale fusion magnet systems.

关键词： High‐temperature superconducting High‐field magnet Round strands axial tensile and fatigue Microscopic defects

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