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Title:Plane-strain upper-bound analysis of unsymmetrical single-hole and and multi-hole extrusion processes
Author(s):Ulysse, Patrick; Johnson, Robert E.
Subject(s):Plane-strain Upper-bound Analysis
Single Hole Extrusion
Multi-hole Extrusion Processes
Abstract:A plane-strain upper-bound analysis of the eccentric single-hole extrusion and unsymmetrical multi-hole extrusion is presented by using analytical and semi-analytical expressions. Expressions for the following dependent process parameters have been developed: the extrusion pressure, exit angle and velocity of the emerging product. The given relations may be applied to an extrusion die with any number of aligned orifices. The analytical or numerical optimization of the upper-bound expression for the power, allowed a study of the dead zone angles of the assumed pattern of deformation. The results are given as a function of the independent process parameters, such as, the eccentricity of the holes, distance between the holes, shear factor coefficient, fractional reduction and the ram position. To verify the accuracy of the results, quantitative and qualitative comparisons are made with published works from the literature.
Issue Date:1995-05
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 810
Genre:Technical Report
Sponsor:Aluminum Company of American 95/05
Rights Information:Copyright 1995 Board of Trustees of the University of Illinois
Date Available in IDEALS:2021-11-04

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  • Technical Reports - Theoretical and Applied Mechanics (TAM)
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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