Simultaneously bending and tensile strain effect on critical current in YBCO coated conductors

• Published in: Physica. C, Superconductivity Vol. 463-465; pp. 742 - 746
• Main Authors: Sugano, M., Shikimachi, K., Hirano, N., Nagaya, S.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.10.2007; Elsevier Science
• Subjects: Bending strain; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Critical current; Critical currents; Exact sciences and technology; High-tc films; Mechanical and acoustical properties, elasticity, and ultrasonic attenuation; Physics; Properties of type I and type II superconductors; Superconducting films and low-dimensional structures; Superconductivity; Tensile strain; YBCO coated conductor; 74.25.Sv; Tensile strain; Critical current; YBCO coated conductor; 74.72.Bk; Bending strain; 74.25.Ld; YBCO coated conductor; Bending strain; Tensile strain; Critical current; Tensile tests; Combined load; Barium oxides; High-Tc superconductors; Test method; 74.25.Sv; 74.25.Ld; 74.72.Bk; Uniaxial strain; Energy storage systems; Application; Copper oxides; Yttrium oxides; Bending test; Strain rate
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/j.physc.2007.03.501

YBCO coated conductors have been expected for the application to a coil for superconducting magnetic energy storage (SMES). In the application to a superconducting coil, the coated conductors experience bending, uniaxial tensile strain and their combined strain. Therefore, the influence of simultaneous bending and tensile strain on critical current should be revealed. In this work, we developed the test method of critical current under such combined strain state. As a result, it was confirmed that compressive pre-bending can improve the stress tolerance of the YBCO coated conductors. On the other hand, compressive bending strain suppresses the initial critical current by the intrinsic strain effect. These results indicate that optimal bending radius should be selected in order to realize superior stress tolerance and high current capacity simultaneously.