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Communication Dans Un Congrès Année : 2016

Temperature, mechanical stress and current density distributions in YBCO bulks during magnetization

Résumé

A theoritical coupled thermal, mechanical and electromagnetic model of a YBCO disk under Field Cooling and Zero-Field Cooling magnetizations was implemented and the trapped magnetic flux density was computed as a function of the applied magnetic field. Due to the symmetry of the problem, an axisymmetrical model using Finite Element Method and the A-formulation of the Maxwell’s equations were implemented. One of the complexity of modelling superconducting bulks is the actual determination of the currrent path within the bulk which strongly depends on the chosen model of the critical current density. Assuming an isotropic material, the pure knowledge of the temperature distribution resulting from local Joule dissipation allows to define in first approximation the limitation of the intensity of persistent currents. However, the induced current in conjunction with large applied magnetic fields may lead to large mechanical stresses in addition to the pre-existing thermal induced ones. These effects mechanical in nature may well play a role in the local dissipation especially under intense magnetic field and pulsed magnetization. In the present work, the influence of the combination of both phenomena is qualitatively studied to determine how they may influence the magnetic behaviour of YBCO bulks and their ability to capture large magnetic flux densities.
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Dates et versions

hal-01369687 , version 1 (21-09-2016)

Identifiants

  • HAL Id : hal-01369687 , version 1

Citer

Frédéric Trillaud, Kévin Berger, Bruno Douine, Jean Lévêque. Temperature, mechanical stress and current density distributions in YBCO bulks during magnetization. ASC 2016 - Applied Superconductivity Conference, Sep 2016, Denver, Colorado, United States. page 192/4MPo1D-07. ⟨hal-01369687⟩
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