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dc.contributor.authorMaity, K P-
dc.contributor.authorKar, P K-
dc.contributor.authorDas, N S-
dc.identifier.citationJournal of Materials Processing Technology, Vol 62, Iss 1-3, P 185-190en
dc.descriptionCopyright of this article belongs to Elsevier Science Ltd.en
dc.description.abstractAn upper-bound analysis is proposed for the extrusion of square sections from square billets through curved dies having prescribed profiles. Kinematically-admissible velocity fields for the purpose are derived using the dual-stream-function technique. Analytical results are presented for both frictionless and sticking friction conditions; for the latter situation the die geometry has been optimised with respect to appropriate parameters. It is shown that a cosine-shaped die with zero entry and exit angles yields the lowest extrusion pressure in the absence of friction, whilst the best upper-bound is provided by a straight tapered die under sticking-friction conditions. The internal work of deformation, however, is still found to be minimum for a straight die for frictionless extrusion.en
dc.format.extent438335 bytes-
dc.subjectSquare shapesen
dc.subjectSquare billetsen
dc.subjectUpper-bound analysisen
dc.titleA class of upper-bound solutions for the extrusion of square shapes from square billets through curved diesen
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