| Project/Area Number |
01420020
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
材料力学
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| Research Institution | Tohoku University |
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Principal Investigator |
SHOJI Tetsuo Tohoku University, Research Institute for Fracture Technology, Professor, 工学部, 教授 (80091700)
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| Co-Investigator(Kenkyū-buntansha) |
SAKA M. Tohoku University, Dept. Mechanical Engineering, Associate Professor, 工学部, 助教授 (20158918)
SHINDO Y. Tohoku University, Dept. Mechanical Engineering II, Professor, 工学部, 教授 (90111252)
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| Project Period (FY) |
1989 – 1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥22,200,000 (Direct Cost: ¥22,200,000)
Fiscal Year 1991: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1990: ¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 1989: ¥14,600,000 (Direct Cost: ¥14,600,000)
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| Keywords | SQUID / Micro Crack / Oxide Superconductor / Bragilian Test / Transition / Micro Fracture Mechanism / Kaiser Effect / Micro Magnetic Field Measurement / 超伝導酸化物 / 磁場変動 / クエンチ / 破壊予知 / 超伝導 / 電磁破壊 / YBCO / 破壊特性 |
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| Research Abstract |
In order to establish a reliable use of high Tc uxide superconductor such as YBCO, mechanistic understanding of brittle failure of these ceramics superconductors have to be achieved to apply these materials for engineering parts and / or component which can be subjected a large current causing large electromagnetic force. In micro crack initiation and propagation can be failure processes as well as other ceramics materials. In this research, SQUID (Superconducting Quantum Interference Device) has been successfully applied to detect micro crack for formation and growth of YBCO under leading condition. Magnetic field analysis was also performed for determination of location of micro cracking and result in identify the cracking site of specimens. Results can be summarized as follows,
1) Micro crack initiation and stable crack growth were observed in YBCO under mechanical loading and confirmed by use of Kaiser effect.
2) These stable micro crack formation was detected nondestructively by means of SQUID.
3) Quench phenomenon can be detected at a very early stage by SQUID.
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