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Dizon, John Ryan C.,Bonifacio, Rolly,Park, Sung-Taek,Shin, Hyung-Seop The Korean Society of Superconductivity and Cryoge 2007 한국초전도저온공학회논문지 Vol.9 No.4
In practical applications of HTS tapes for electric devices such as coils and power cables, the jointing of HTS tapes is inevitable even though long length tapes have recently been achieved. The critical current, $I_c$, degradation behaviors with tensile and bending deformations were investigated in commercially available YBCO coated conductor tapes. When the V-I relationship was measured at the jointed section of the lap-jointed YBCO CC tapes, the resistance at the joint decreased with increasing joint length. The critical load for 95% $I_c$ retention were determined for the IBAD and RABiTS YBCO tapes and they were 175 and 355N, respectively. Fracture occurred at the unjointed part which represents strong copper lamination and solder jointing. The electro-mechanical properties of lap-jointed CC tapes depended on the properties of single tapes. The V-I behavior under bending strain was similar with the tensile case.
Shin, Hyung-Seop,Dizon, John Ryan C.,Bonifacio, Rolly,Park, Jeong-Soo The Korean Society of Superconductivity and Cryoge 2007 한국초전도저온공학회논문지 Vol.9 No.2
The critical current, $I_c$, degradation behaviors with bending strain were investigated in a commercially available YBCO coated conductor tape. In particular, the strain reversibility of $I_c$ and the influence of repeated bending on $I_c$ have been studied. Also, repeated bending at 77 K was done in order to understand the Ie behavior under cyclic bending strains. A reversible behavior of $I_c$ has been found up to a high bending strain of 1.60% for the RABiTS/MOD processed CC sample with copper reinforcement. Under repeated bending, the Ie showed a 95% $I_c$ retention up to 100 cycles for bending strains of 1.0% or less. The n-value behavior showed a good agreement with the $I_c$ degradation behavior, representing that any cracking did not occur on the YBCO film resulting from the reinforcement provided by the copper stabilizers.
신형섭,John Ryan C. Dizon,Rolly Bonifacio,박정수 한국초전도.저온공학회 2007 한국초전도저온공학회논문지 Vol.9 No.2
The critical current, Ic, degradation behaviorswith bending strain were investigated in a commercially available YBCO coated conductor tape. In particular, the strain reversibility of Ic and the influence of repeated bending on Ic have been studied. Also, repeated bending at 77 K was done in order to understand the Ic behavior under cyclic bending strains. A reversible behavior of Ic has been found up to a high bending strain of 1.60% for the RABiTS/MOD processed CC sample with copper reinforcement. Under repeated bending, the Ic showed a 95% I c retention up to 100 cycles for bending strains of 1.0% or less. The n-value behavior showed a good agreement with the Ic degradation behavior, representing that any cracking did not occur on the YBCO film resulting from the reinforcement provided by the copper stabilizers.