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Study on the fully coupled electromagnetic–thermal–mechanical quench and delamination damage evolution of the NI HTS coil under local thermal disturbance
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DOI：10.1088/1361-6668/ae514f.png)
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Abstract
En 中文
In the application of high-field magnets, the quench behavior of no-insulation (NI) REBCO high-temperature superconducting coils can easily induce mechanical damage, which has become a key bottleneck restricting their development. In this paper, based on the improved T–A formulation with Neumann boundary conditions, a coupled electromagnetic–force–thermal multi-physical field model is established to systematically study the quenching characteristics of superconducting coils and their induced delamination failure behavior under the local thermal disturbances. A radial strain rate-based failure criterion is then proposed to investigate the correlation between the radial strain rate and the failure characteristics. A cohesive force model cohesive zone model is introduced to simulate the interface damage evolution of NI coils under localized thermal disturbances. The results show that the NI structure significantly improves the quench propagation velocity and enhances the thermal stability through the metal layer shunting effect. Concurrently, the strain rate field has a sensitive response to the temperature change and mechanical state during the quench process. The positive and negative values of the strain rate can clearly distinguish the quench recovery and persistence state, and the mutation peak can accurately locate the quench front and the stress concentration area, which are highly consistent with the high temperature gradient distribution. High working currents significantly increase the peak value of thermal strain rate and aggravate the thermal mechanical load. In addition, the location of thermal disturbance has a key influence on the damage mode. This study reveals the key role of strain rate in assessing the degree of quench and predicting mechanical failure, and provides a theoretical basis for the design and management of quench protection for NI coils with coupled multi-physical fields.
Keywords:
quench behavior
no-insulation REBCO coil
electromagnetic-thermal-mechanical coupling
delamination failure
strain rate criterion
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