15 T背场磁体Tail结构设计和力学分析

Design and mechanical analysis for tail structure of 15 T background magnet

Tail结构是背场磁体出线头的连接固定部件,起到传导载荷和增强连接强度的作用。运用有限元的方法,计算背场磁体装置运行时的电磁载荷,开展多工况下超导磁体关键部件Tail结构的力学分析。结果表明,Tail结构最大应力集中点出现在不锈钢腿2与线圈倒数第二匝导体焊接处,最大等效应力为641.01 MPa,应力线性化后的应力幅值小于设计许用值,复合材料绝缘隔断的最大法向应力和剪切应力分别为226 MPa和77 MPa,均低于许用值。所设计的Tail结构具有足够的强度来承受运行过程中的载荷,证明了结构设计的合理性。

Tail structure is the connection mechanical structure for the terminals of the background coil, which enhances the connecting strength and the bearing capability for the terminals. Based on finite element method, the electromagnetic load of the background magnet was calculated and the mechanical analysis for the tail structure under varied operation conditions was carried out. The analysis results show that the peak stress appears at the weld of the leg 2 and the last-but-one conductor, at operating condition is 641.01 Mpa, the peak stress after stress linearization is lower than allowable limits, the peak normal stress and peak shear stress of insulation strap are 226 Mpa and 77 Mpa, which also lower than allowable limits. The tail structure has enough strength to bear the load during operation, which can prove the rationality of the structure design.