The VUB method, proposed by Yeh and Yang , is an abbreviation of the term "Variational Upper-Bound" method, and it is the method which solves the upper-bound solution by use of the technique of variational calculus. In this investigation, the plane strain tube extrusion problem is analyzed by using the VUB method and it is also experimentally developed for the purpose of verifying the validity of theoretical analyses. Primary attention is paid to the deformation behavior of the extruded specimens made of 6061-O aluminum alloy. The result shows that the VUB method can offer a better solution than the conventional upper-bound (UB) method since the Natural Boundary Conditions (NBCs), which are derived in this investigation, can be used to reasonably account for the effect of friction upon the interfaces of tools and the workpiece.
|Number of pages||16|
|Journal||Journal of Materials Processing and Manufacturing Science|
|State||Published - 1997|