Numerical optimisation of mechanical ring reinforcement for bulk high-temperature superconductors

Barthlott, D; Huang, K Y; Durrell, J H; Cardwell, D A; Holzapfel, B; Ainslie, M D

Abstract:
The finite element method has been used extensively in recent years to solve various problems related to applied superconductivity and provides a useful tool for analysing and predicting experimental results. Based on a recently-developed modelling framework, implemented in the finite element software package COMSOL Multiphysics, investigations on the minimum ring reinforcement required to prevent mechanical failure in bulk high-temperature superconducting magnets have been carried out. Assuming homogeneous J$_{c}$(B,T) across the bulk sample irrespective of its dimensions, the maximum magnetic stresses experienced, and the minimum ring thickness required to prevent the hoop and radial stresses from exceeding the tensile strength of the bulk superconductor have been determined for varying values of the Young's modulus, radius, height and temperature of a representative single-grain Ag-containing Gd-Ba-Cu-O bulk sample. This comprehensive analysis details the influence each of these key parameters has on the magnetic stress and hence their impact on the necessary ring thickness to prevent mechanical failure in any given system, i.e., for any combination of material properties and sample dimensions.

 Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP) Publikationstyp Zeitschriftenaufsatz Publikationsmonat/-jahr 06.2020 Sprache Englisch Identifikator ISSN: 1742-6588, 1742-6596 KITopen-ID: 1000127248 Erschienen in Journal of Physics: Conference Series Verlag IOP Publishing Band 1559 Seiten 012031 Bemerkung zur Veröffentlichung 14th European Conference on Applied Superconductivity, EUCAS 2019, Glasgow, United Kingdom, 1 - 5 September 2019 Vorab online veröffentlicht am 20.06.2020 Nachgewiesen in Scopus
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