The Buckling Analysis of the Armature (Cylindrical Shell) in Coilguns

Cao Hongjun, Chen Jianjun, Wang Deman
£¨Xidian University, Xi'an 710071£©

Abstract: In this paper, the elastic buckling problem of a 5-stage coilgun's armature loaded with complex electromagnetic forces is analyzed using FEM. The 8-nodded is oparametric shell element is used and the calculation model under the global cylindrical coordinate system is given. The calculation of electromagnetic forces,   the load distribution and the problem of locking are discussed in detail. A linear buckling analysis program for perfect cylindrical thin-shells is composed and the critical loads of a 5-stage gun's armature are obtained.
Keywords: coilgun, armature, buckling, FEM, cylindrical shell.