CUED Publications database

Spatial Distribution of Flexural Strength in Y-Ba-Cu-O Bulk Superconductors

Huang, KY and Zhou, D and Srpcic, J and Shi, Y and Namburi, DK and Dennis, A and Ainslie, MD and Boll, M and Bause, R and Filipenko, M and Durrell, JH and Cardwell, DA (2018) Spatial Distribution of Flexural Strength in Y-Ba-Cu-O Bulk Superconductors. IEEE Transactions on Applied Superconductivity, 28. ISSN 1051-8223

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Abstract

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.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Div C > Engineering Design
Depositing User: Unnamed user with email sms67@cam.ac.uk
Date Deposited: 19 Mar 2018 20:06
Last Modified: 09 Sep 2021 02:26
DOI: 10.1109/TASC.2018.2814055