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The correlation between mechanical properties and electric current under thermal shock for YBa 2 Cu 3 O x superconductors

The correlation between mechanical properties and electric current under thermal shock for YBa 2... High temperature YBa 2 Cu 3 O x (123, YBCO) superconductors have been shown to possess high current carrying capability which is confined to currents flowing along the strongly super-conducting a-b planes within a single oriented domain. Usually, in this material, thermal cycling occurs in the temperature region ranging from −196°C (liquid nitrogen) under actual operation to room temperature under out of operation for maintenance. Micro-cracks are considered to initiate during these thermal cycles which result in the high electric resistance. Therefore, the existence of micro-cracks is considered to be a dominant factor in decreasing J c . In this study, an apparatus for thermal cycling has been designed and built to provide thermal cycles ranging from −196°C to room temperature. To clarify the time sequential deterioration on the mechanical properties of YBCO due to thermal cycles, a sharp notched RCT specimen with 20° of notch tip angle and 0.02 mm of notch tip radius was designed. By using this specimen, the time sequential deterioration of stiffness, dP/dδ and fracture toughness of YBCO for a sharp notched RCT specimen due to thermal cycles were investigated. The results show a correlation between these mechanical properties and previously obtained the super-conducting properties of this material. Thermal cycling causes the deterioration of mechanical properties which results in the deterioration of critical current density. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Strength, Fracture and Complexity IOS Press

The correlation between mechanical properties and electric current under thermal shock for YBa 2 Cu 3 O x superconductors

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Publisher
IOS Press
Copyright
Copyright © 2004 by IOS Press, Inc
ISSN
1567-2069
eISSN
1875-9262
Publisher site
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Abstract

High temperature YBa 2 Cu 3 O x (123, YBCO) superconductors have been shown to possess high current carrying capability which is confined to currents flowing along the strongly super-conducting a-b planes within a single oriented domain. Usually, in this material, thermal cycling occurs in the temperature region ranging from −196°C (liquid nitrogen) under actual operation to room temperature under out of operation for maintenance. Micro-cracks are considered to initiate during these thermal cycles which result in the high electric resistance. Therefore, the existence of micro-cracks is considered to be a dominant factor in decreasing J c . In this study, an apparatus for thermal cycling has been designed and built to provide thermal cycles ranging from −196°C to room temperature. To clarify the time sequential deterioration on the mechanical properties of YBCO due to thermal cycles, a sharp notched RCT specimen with 20° of notch tip angle and 0.02 mm of notch tip radius was designed. By using this specimen, the time sequential deterioration of stiffness, dP/dδ and fracture toughness of YBCO for a sharp notched RCT specimen due to thermal cycles were investigated. The results show a correlation between these mechanical properties and previously obtained the super-conducting properties of this material. Thermal cycling causes the deterioration of mechanical properties which results in the deterioration of critical current density.

Journal

Strength, Fracture and Complexity – IOS Press

Published: Jan 1, 2004

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