A New 3D Velocity Field with a Variable Axial Component for Optimizing Forward Extrusion Pressure

A new velocity field with variable axial velocity has been proposed in this paper. By using this new formulation the velocity field and upper bound on extrusion pressure have been computed. Incorporating the B Spline curve into the upper bound formulation, 3D surfaces of velocity discontinuity at entry and exit have been assumed. Theoretical prediction of grid deformation pattern was also computed using the present theory. Experiments were carried out and extrusion pressure as well as grid deformation were obtained. The present theoretical results were in good agreement with experimental ones and compared to previous work improvements were observed.