Parametric Influence on the Wall-Thickness Changes and the Bulk Strain Behavior of Hollow-Drawn Tubing

[+] Author and Article Information
J. E. Flinn

Department of Metallurgy, Washington State University, Pullman, Wash.

J. Basic Eng 91(4), 792-809 (Dec 01, 1969) (18 pages) doi:10.1115/1.3571223 History: Received June 30, 1969; Online November 03, 2011


The hollow-drawing behavior of tubing with γ0 values (ratio of initial wall thickness to outer radius) between 0 < γ0 < 1 was studied. The effect of various parameters on wall-thickness changes during hollow drawing through conical shaped dies was examined. The parameters which influenced the wall thickness changes were die-angle, alloy or metal, and γ0 . The reduction per pass or magnitude of draft had only a slight or negligible effect. An examination of the wall-thickness changes in terms of current theories is made. The bulk true strain behavior of hollow-drawn tubing is also evaluated for several metals. These strains are the elongation, hoop, and thickness, and they are examined between the limits of a rod and an infinitely thin-wall tube. These limits and the constancy of volume principle suggest that the strains can be represented by ε = C In r/r0 , where C is a coefficient peculiar to each strain.

Copyright © 1969 by ASME
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