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Influences of Bending Temperature on the Ic Degradation Behavior of Bi-2223 tapes under Bending
신형섭,John Ryan C. Dizon,Kazumune Katagiri,Tsuneo Kuroda 한국초전도.저온공학회 2005 한국초전도저온공학회논문지 Vol.7 No.2
The Ic degradation behavior of Bi-2223 tapes bent at RT and 77K were investigated using the bending device invented by Goldacker. Test results on fixing the tape at RT and 77K showed no difference. At 77K and RT bending, the critical strain was 0.67 and 0.50%, respectively, for the VAM-1 tape. For the AMSC tape, it was 0.94 and 0.88%, respectively. These results show that there is additional residual stress in the superconducting filaments to be bent at 77K which shifts the formation of cracks into smaller bending radii. This was proved by computational analysis based on the mixture rule of composites. For the VAM-1 tape, the Ic degradation behavior using the Goldacker type device shifted to higher strain levels at about 0.5%, as compared with the FRP sample holders which have a critical bending strain of about 0.24%. Also, for the externally reinforced AMSC tape, Ic degradation using the Goldacker type device begins at a higher strain level, at 0.88% as compared with using FRP sample holders, at 0.74%. The difference between both cases can be explained by the tensile and thermal stresses that the tapes were subjected to during fixing (soldering) when the FRP sample holders were used.
Influences of Bending Temperature on the I$_{c}$ Degradation Behavior of Bi-2223 tapes under Bending
Shin Hyung Seop,Dizon John Ryan C.,Katagiri Kazumune,Kuroda Tsuneo The Korea Institute of Applied Superconductivity a 2005 한국초전도저온공학회논문지 Vol.7 No.2
The I$_{c}$ degradation behavior of Bi-2223 tapes bent at RT and 77K were investigated using the bending device invented by Goldacker. Test results on fixing the tape at RT and 17K showed no difference. At 17K and RT bending, the critical strain was 0.67 and 0.50$\%$, respectively, for the VAM-l tape. For the AMSC tape, it was 0.94 and 0.88$\%$, respectively. These results show that there is additional residual stress in the superconducting filaments to be bent at 17K which shifts the formation of cracks into smaller bending radii. This was proved by computational analysis based on the mixture rule of composites. For the VAM-l tape, the Ie degradation behavior using the Goldacker type device shifted to higher strain levels at about 0.5$\%$, as compared with the FRP sample holders which have a critical bending strain of about 0.24$\%$. Also, for the externally reinforced AMSC tape, Ie degradation using the Goldacker type device begins at a higher strain level, at 0.88$\%$ as compared with using FRP sample holders, at 0.74$\%$. The difference between both cases can be explained by the tensile' and thermal stresses that the tapes were subjected to during fixing (soldering) when the FRP sample holders were used.