Analysis of Central Bursting Defects in Extrusion and Wire Drawing

[+] Author and Article Information
B. Avitzur

Department of Metallurgy and Materials Science, Lehigh University, Bethlehem, Pa.

J. Eng. Ind 90(1), 79-90 (Feb 01, 1968) (12 pages) doi:10.1115/1.3604608 History: Received October 21, 1966; Online August 25, 2011


The central burst defect, also called chevroning, in the extruded or drawn product is analyzed. A criterion for the unique conditions that promote this defect has been derived. Measures to prevent the occurrence of central burst are indicated. A major conclusion of the study is that, for a range of combinations of cone angle, reduction, and friction, central bursting is expected in any metal that can be called “Mises’ material.”1 Under such a combination (reduction, cone angle, and friction), even the most ductile material can burst centrally. The flow characteristics, described by Mises’ stress deviator-strain rate relations associated with Mises’ yield criterion, are the only metal properties needed to predict central bursting. No additional fracture criterion is associated with this failure.

Copyright © 1968 by ASME
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