Mechanical Properties of Superconducting Materials

Hannachi, E.; Slimani, Y.

doi:10.1007/978-981-19-1211-5_4

Cited by 1 publication

(1 citation statement)

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“…The strains are considered in the linear elastic range for the current study. This is a reasonable assumption for the failsafe design of high-field superconductor magnets; firstly because the mechanical deformation should be in the range of the reversible elastic range so that tapes are not degraded [44] and secondly as the REBCO material is highly brittle [45] in nature. The FE code is developed in MATLAB and coupled to the already developed MEMEP model [39,43].…”

Section: Introductionmentioning

confidence: 99%

Modelling the mechanics of 32 T REBCO superconductor magnet using numerical simulation

Srivastava,

Pardo

2024

Supercond. Sci. Technol.

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High temperature REBCO superconducting tapes are very promising for high-fieldmagnets. With high magnetic field application there are high electro-mechanical forces, and thusconcern for mechanical damage. Due to the presence of large screening currents and compositestructure of the tape, the mechanical design of these magnets are not straight forward. In addition,many contemporary designs use insulated winding. In this work we develop a novel two-dimensionalaxisymmetric finite element tool programmed in MATLAB that assumes the displacement field withinlinear elastic range. The stack of pancakes and a large number of REBCO tape turns are approximatedas an an-isotropic bulk hollow cylinder. Our results agree with uni-axial stress experiments inliterature, validating the bulk approximation. Here, we study the following configuration. Thecurrent is first ramp up to below the critical current and we calculate the screening currents and theforces that they cause using the MEMEP model. This electromagnetic model can now take insulatedmagnets into account. As a case study 32 T REBCO superconductor magnet is simulated numerically.We have done complete mechanical analysis of the magnet by including the axial and shear mechanicalquantities for each pancake unlike previous work where only radial and circumferential quantities arefocused. Effect on mechanical quantities without screening current is also calculated and compared.It is shown that including screening current induced field strongly affect the mechanical quantities,specially the shear stress. The latter might be the critical quantity for certain magnet configurations.Additionally, in order to overcome high stresses, a stiff over banding of different material is consideredand numerically modelled which significantly reduces the mechanical stresses. The FE based modeldeveloped is efficient to calculate the mechanical behaviour of any general superconductor magnetand its devices.

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