首页|Critical current degradation in an epoxy-impregnated rare-earth Ba2Cu3O7-x coated conductor caused by damage during a quench
Critical current degradation in an epoxy-impregnated rare-earth Ba2Cu3O7-x coated conductor caused by damage during a quench
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High-temperature superconducting(HTS)rare-earth Ba2Cu3O7-x(REBCO)coated conductors(CCs)have significant potential in high-current and high-field applica-tions.However,owing to the weak interface strength of the laminated composite REBCO CCs,the damage induced by the thermal mismatch stress under a combination of epoxy impregnation,cooling,and quenching can cause premature degradation of the critical cur-rent.In this study,a three-dimensional(3D)electromagnetic-thermal-mechanical model based on the H-formulation and cohesive zone model(CZM)is developed to study the critical current degradation characteristics in an epoxy-impregnated REBCO CC caused by the damage during a quench.The temperature variation,critical current degradation of the REBCO CC,and its degradation onset temperature calculated by the numerical model are in agreement with the experimental data taken from the literature.The de-lamination of the REBCO CC predicted by the numerical model is consistent with the experimental result.The numerical results also indicate that the shear stress is the main contributor to the damage propagation inside the REBCO CC.The premature degra-dation of the critical current during a quench is closely related to the interface shear strength inside the REBCO CC.Finally,the effects of the coefficient of thermal expan-sion(CTE)of the epoxy resin,thickness of the substrate,and substrate material on the critical current degradation characteristics of the epoxy-impregnated REBCO CC during a quench are also discussed.These results help us understand the relationship between the current-carrying degradation and damage in the HTS applications.
epoxy-impregnated rare-earth Ba2Cu3O7-x(REBCO)coated conductor(CC)quenchdamagecritical current degradationshear stress
Donghui LIU、Huadong YONG、Youhe ZHOU
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Institute of Superconductor Mechanics,Lanzhou University,Lanzhou 730000,China
Department of Mechanics and Engineering Sciences,College of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China
Key Laboratory of Mechanics on Disaster and Environment in Western China,Ministry of Education of China,Lanzhou University,Lanzhou 730000,China
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