Abstract
The upper-bound technique has been used to investigate the relative importance of the various parameters in the floating-plug tube-drawing process. A kinematically admissible velocity field is assumed for the deformation process, and the solution takes into account the position of the plug in the deformation zone, redundant work, friction, and strain hardening. The proposed mode of deformation is substantiated by experimental evidence and by comparison of theoretical and experimental values af the drawing stress.