Master of Science
Materials Science and Engineering
The upper bound approach is used to analyze combined backward-forward extrusion. The deformation region is divided into five zones separated by planer and cylindrical surfaces of velocity discontinuities. The internal power of deformaiton and shear and friction losses, are computed individually and summed. The pseudo-independent process parameter is the backward rate of flow with respect to which the total power of deformation is optimized. The optimal backward rate of flow is assumed to be the actual one.
Mori, Masahiro, "Analysis of combined backward-forward extrusion" (1973). Theses and Dissertations. 4133.