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.
Analysis of Central Bursting Defects in Extrusion and Wire Drawing
Department of Metallurgy and Materials Science, Lehigh University, Bethlehem, Pa.
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Avitzur, B. (February 1, 1968). "Analysis of Central Bursting Defects in Extrusion and Wire Drawing." ASME. J. Eng. Ind. February 1968; 90(1): 79–90. doi: https://doi.org/10.1115/1.3604608
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