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dc.contributor.authorShinden, M
dc.contributor.authorFujishiro, H
dc.contributor.authorTakahashi, K
dc.contributor.authorAinslie, Mark
dc.description.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>
dc.description.sponsorshipJSPS 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
dc.publisherIOP Publishing
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.titlePossibility of mechanical fracture of superconducting ring bulks due to thermal stress induced by local heat generation during pulsed-field magnetization
dc.publisher.departmentDepartment of Engineering
prism.publicationNameSuperconductor Science and Technology
dc.contributor.orcidFujishiro, H [0000-0003-1483-835X]
dc.contributor.orcidTakahashi, K [0000-0002-8278-2688]
dc.contributor.orcidAinslie, Mark [0000-0003-0466-3680]
rioxxterms.typeJournal Article/Review
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/P020313/1)
cam.orpheus.successWed Mar 23 10:26:36 GMT 2022 - Embargo updated
pubs.licence-display-nameApollo Repository Deposit Licence Agreement

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Attribution-NonCommercial-NoDerivatives 4.0 International
Except where otherwise noted, this item's licence is described as Attribution-NonCommercial-NoDerivatives 4.0 International