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| Totally five finite element (FE) models are presented, they are used to analyze the stress and strain within the first MICE coupling coils during the pretension winding process. The FE models are built based on the principle of nested thin wall cylinder, and advanced FE technologies such as the "birth and death" and the contact. By comparing the computation results of the first three models, the deformation at the bobbin flanges for the first MICE coupling coil does not be predicted by the original FE model. Moreover, the limitation of the "birth and death" technology is revealed when it is applied to stress analysis for the pretension winding process. Because of its limitation, by mean of "birth and death" technology can only draw an approximate result. In order for the numerical simulation is as closely as possible to the real winding process, it is necessary to minimize the radial displacement. As the result, a new FE model is established, where roles of the coil bobbin support and coil fabrication process is taken into account. The process includes winding coil, welding cover plate, and removing bobbin support. In addition, the bobbin support is modified to satisfy the application condition for the "birth and death" element. By exploring the improved method, the computation results predict the actual stess and strain status of the finished superconducting coil more accurately. |
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| Keywords:Superconducting coil; stress analysis; FE model; pretension. |
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