Interfacial Shearing and Transverse Normal Stress in a Superconducting Coated Conductor Strip with Combined Transport Current and Magnetic Field

The flux-pinning-induced transverse normal stress and interfacial shearing stress are investigated for a long superconducting coated conductor strip combining the transport current and magnetic field. The induced critical current is set to be field independent and the zero field cooling condition is discussed. Based on the plane strain approach, a singular integral equation governing the flux pinning force and interfacial shearing stress is obtained. Then, the different magnetized fields and the influence of the substrate stiffness are also investigated. The results show that the transverse normal stress is unsymmetrical along the direction of strip width. Unusually, an obvious tensile stress appears on one side of the strip as the field increases. Further, this tensile stress increases when the field decreases from its maximum value. It is observed that a stiffer substrate receives a larger tensile normal stress and shearing stress. The results are used to predict the largest possibility of cracking or tearing as the superconducting coated conductor strip is working in an external combined field.