RESEARCH PAPERS: Production Engineering Papers

Criterion for the Prevention of Core Fracture During Extrusion of Bimetal Rods

[+] Author and Article Information
B. Avitzur, R. Wu, S. Talbert, Y. T. Chou

Lehigh University, Institute for Metal Forming, Department of Metallurgy and Materials Engineering, Bethlehem, Pa. 18015

J. Eng. Ind 104(3), 293-304 (Aug 01, 1982) (12 pages) doi:10.1115/1.3185833 History: Received April 05, 1982; Online July 30, 2009


Based on the upper-bound theorem in limit analysis, a theoretical model for core fracture in bimetal rods during extrusion has been developed and a fracture criterion established. The variables affecting core fracture are: reduction in area (r%) , die geometry, friction (m) , relative size of the core and relative strength of the core. Within the wide range of possible combinations of these process variables, only a small range permits extrusion without fracture. With suitable modifications the present analysis can be extended to develop criteria for sleeve fracture during extrusion and for both core and sleeve fracture during drawing.

Copyright © 1982 by ASME
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