On the Extrusion in Superplastic Conditions

[+] Author and Article Information
A. Alto

Istituto di Tecnologie, Universita di Bari, Bari, Italy

G. Giorleo

Istituto di Ingegneria, Universita di Salerno, Salerno, Italy

J. Eng. Ind 97(3), 1131-1135 (Aug 01, 1975) (5 pages) doi:10.1115/1.3438666 History: Received July 26, 1974; Online July 15, 2010


In this paper the range within which the slab method is accurate enough to calculate the extrusion pressure in superplastic condition has been determined. A realistic velocity field, supported by experimental evidence, has been adopted. A strain rate field has been evaluated and an appropriate constitutive equation has been introduced. The slab method and the upper bound approach, here developed, have then been used to study the superplastic extrusion through a conical die. A comparison of the two solutions thus obtained has been carried out. It has been found that in any case the curves obtained using the slab method run higher than those obtained using the upper-bound approach. The analysis developed may be used to determine the range within the slab method is accurate enough for engineering purposes.

Copyright © 1975 by ASME
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