Abstract
A large amount of experimental data indicates that a typical butterfly-shaped failure interface will appear in the recovered armature. In order to reveal the mechanisms and their influence on transition, an electromagnetic-thermal-mechanical coupling analysis is carried out on the C type armature and the rectangular section rails. The contact properties subjected to both pretightening force and Lorentz force, transient temperature field, and variation of Lorentz body force density on the interface of armature and rails are discussed by using the 3-D finite method. The results show that the nonuniform distribution of current density, heat flux, and Lorentz force density, which is caused by the pulse current, is the main cause of the butterfly-shaped failure interface.
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