Local deformation and buckling of a cylindrical Al tube under magnetic impulsive pressure

In this paper, local deformation and buckling of a cylindrical Al tube unde r impulsive pressure is discussed. To give a local shock load, five kinds o f mandrels were inserted into the tube. The mandrel has an axial length of 50 mm and a V-shaped groove in the axial direction of the groove angle of 4 5, 90, 120, 150 and 180 degrees. The tube was freely deformed into the groo ve by applying external magnetic pressure produced by an electromagnetic fo rming device. The condenser capacity of the electromagnetic forming device had a constant value of 400 mu F and the discharging energy of the device, which was the origin of the shock load acting on the cylindrical tube, was controlled by the charging voltage of the condenser. The deformation proces s was recorded by a high-speed camera and the deformation behavior was anal yzed using the finite-element method. (C) 1999 Elsevier Science S.A. Ail ri ghts reserved.