Possibility of mechanical fracture of superconducting ring bulks due to thermal stress induced by local heat generation during pulsed-field magnetization
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Publication Date
2022Journal Title
Superconductor Science and Technology
ISSN
0953-2048
Publisher
IOP Publishing
Type
Article
This Version
AM
Metadata
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Shinden, M., Fujishiro, H., Takahashi, K., & Ainslie, M. (2022). Possibility of mechanical fracture of superconducting ring bulks due to thermal stress induced by local heat generation during pulsed-field magnetization. Superconductor Science and Technology https://doi.org/10.1088/1361-6668/ac5785
Abstract
<jats:title>Abstract</jats:title>
<jats:p>During quasi-static magnetization of bulk superconductors using field-cooled magnetization (FCM) from high fields at low temperatures, such bulks are sometimes broken, which is believed to be mainly due to an electromagnetic force—and subsequent stress—larger than the fracture strength. However, a ring bulk can break, even during pulsed field magnetization (PFM), from relatively lower pulsed fields and at relatively higher temperatures. Previous simulation results suggest that the ring bulk should not break due to the electromagnetic force during PFM. In this paper, taking experimental and numerical results into consideration, we propose the possibility of mechanical fracture of a ring bulk during PFM due to thermal stress induced by local heat generation, which has not been considered and investigated to date. Two numerical models with different sizes of heat-generating region were constructed for the ring bulk with a relatively large inner diameter (60 mm outer diameter, 36 mm inner diameter, 17 mm height). For Model-1, with a large heat region, the bulk fracture due to the thermal stress results from the tensile stress along the radial direction in the neighboring heat region. The risk of bulk fracture is enhanced at the inner or outer edges of the bulk surface, compared with that inside the bulk. For Model-2, with a small heat region inside the bulk, the bulk fracture due to the thermal stress results from the compressive stress along the radial direction in the neighboring heat region. These results strongly suggest the possibility of mechanical fracture of an actual ring bulk due to thermal stress induced by local heat generation. This idea is also applicable more generally to the fracture mechanism during FCM of superconducting bulks.</jats:p>
Sponsorship
JSPS KAKENHI Grant No. 19K05240;
Adaptable and Seamless Technology transfer Program through Target-driven R&D (A-STEP), Japan Science and Technology Agency (JST), Grant Nos. VP30218088419 and JPMJTM20AK;
EPSRC Early Career Fellowship EP/P020313/1
Funder references
Engineering and Physical Sciences Research Council (EP/P020313/1)
Embargo Lift Date
2023-03-04
Identifiers
External DOI: https://doi.org/10.1088/1361-6668/ac5785
This record's URL: https://www.repository.cam.ac.uk/handle/1810/334346
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International
Licence URL: https://creativecommons.org/licenses/by-nc-nd/4.0/
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