Abstract: In this paper, two new
theories are proposed for upsetting a cylinder between common
flat platens according to the ratio of height to diameter H/D of
upsetting body, that is, tension stress theory of a rigid
plastic mechanical model for H/D ≥ 1 and shear stress theory of
a hydrostatic stress mechanical model for H/D ≤1. The new
theories may properly describe the approximate distribution law
of the internal stresses, which have been testified by
experiments. The theories correct the wrong viewpoint and
incomplete statement on upsetting in plastic mechanics. They are
of value to theory and engineering use.
Key words:
Cylinder Upsetting Mechanics
* This project is supported by National Natural Science Foundation of
China and Education Departmental Pre-study Foundation of Ministry of
Machinery & Electronics Industry of China. Manuscript
received on October 19, 1991; revised manuscript June 5, 1992
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