Multiphysics Stress Analysis of a 1.5 T Superconducting MRI Magnet

Thekkethil, Sankar Ram; Rastogi, Vipul; Kar, Soumen

doi:10.1007/s10948-023-06502-x

Cited by 1 publication

(2 citation statements)

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“…The element death means that the stiffness matrix of the element is deactivated by multiplying by a small factor instead of deleting all coil assembly elements from the model, and then the associated loads and mass parameters of the dead elements are set to zero. While the element birth means reactivating all the elements by deleting the small factor [21,22]. (2) Thermal stress after cooling down from 300 K to 4.2 K. The whole coil model was applied with thermal gradient of 295.8 K, and the temperature distribution throughout the cooling process was regarded as uniform.…”

Section: Load Sources Of Superconducting Magnetmentioning

confidence: 99%

“…In every design step, the geometric model, material properties, boundary conditions and adaptive mesh are set in sequence, and then the partial differential equations are solved [20]. The element birth and death method is widely used in the calculation of winding process in a magnet [21,22]. By using an FEA program, the thermal and structural calculations are prone to be carried out along with the element birth and death method [23].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Analysis and Testing of Conduction-Cooled Superconducting Magnet for Levitation Force Measurement Application

et al. 2023

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High-temperature superconductors have great potential for various engineering applications such as a flywheel energy storage system. The levitation force of bulk YBCO superconductors can be drastically increased by increasing the strength of the external field. Therefore, a 6T conduction-cooled superconducting magnet has been developed for levitation force measurement application. Firstly, to protect the magnet from mechanical damage, reliable stress analysis inside the coil is paramount before the magnet is built and tested. Therefore, a 1/4 two-dimensional (2D) axisymmetric model of the magnet was established, and the mechanical stress in the whole process of winding, cooling down and energizing of the magnet was calculated. Then, the charging, discharging, and preliminary levitation force performance tests were performed to validate the operating stability of the magnet. According to the simulation results, the peak stresses of all coil models are within the allowable value and the winding maintains excellent mechanical stability in the superconducting magnet. The test results show that the superconducting magnet can be charged to its desired current of 150 A without quenching and maintain stable operation during the charging and discharging process. What is more, the superconducting magnet can meet the requirements for the levitation force measurement of both low magnetic field and high magnetic field.

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Section: Load Sources Of Superconducting Magnetmentioning

confidence: 99%