Spatial Distribution of Flexural Strength in Y–Ba–Cu–O Bulk Superconductors
| Autor: | Martin Boll, A R Dennis, Jan Srpcic, David A. Cardwell, Difan Zhou, Mykhaylo Filipenko, Yunhua Shi, Kai Yuan Huang, Devendra Kumar Namburi, Mark D. Ainslie, Roman Bause, John H. Durrell |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Superconductivity Yield (engineering) Materials science Weibull modulus Yttrium barium copper oxide Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Stress (mechanics) chemistry.chemical_compound Flexural strength chemistry 0103 physical sciences Ultimate tensile strength Electrical and Electronic Engineering Composite material 010306 general physics Porosity |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 28:1-5 |
| ISSN: | 1558-2515 1051-8223 |
| DOI: | 10.1109/tasc.2018.2814055 |
| Popis: | In order to determine the spatial distribution of the flexural strength, three-point bend tests have been performed on bar specimens cut from four YBa2Cu3O7− δ single-grain bulk superconductors. A relatively large spread of the room temperature flexural strength, average and standard deviation of 49.3 MPa and 12.7 MPa, respectively, was observed across the four bulk samples. This is attributed to the systemic microstructural variation introduced by the seeded melt growth. In particular, the strength was shown to be related to the local porosity and Y2BaCuO5 content. To further examine bulk-to-bulk variability, indirect tensile (Brazilian) tests were conducted on twelve 16-mm-diameter bulk superconductors from three production batches. The Weibull modulus for these was calculated to be 8.76, suggesting that, despite the large spread in strength with position within a bulk, the batch processing of bulk superconductors can consistently yield samples with comparable overall mechanical strengths. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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