Sk. Sahoo et al., A numerical application of the upper-bound technique for round-to-hexagon extrusion through linearly converging dies, J MATER PR, 91(1-3), 1999, pp. 105-110
The growing interest in the modelling of metal forming processes in recent
years has brought about the development of different analytical and/or nume
rical techniques. The SERR technique is eminently;suitable for analyzing ex
trusion of sections having re-entrant corners. However, in its present form
, it can not be used to analyse forming processes where the deformation zon
e has curved boundaries, since the elementary regions will no longer remain
rigid. The present study is an endeavor to remodel this technique so that
it can handle round billets. The circular cross-section of the round billet
is approximated by a regular polygon of equal area and the number of sides
of the polygon is increased progressively until convergence of the extrusi
on pressure is achieved. As a test, the extrusion of hexagon-section bars f
rom round billets through linearly converging dies is analyzed. (C) 1999 El
sevier Science S.A. All rights reserved.