Void Growth in Plastically Deformed Free-Cutting Brass

[+] Author and Article Information
M. J. Worswick

Defence Research Establishment, Suffield, Ralston, Alberta TOJ 2NO, Canada

R. J. Pick

University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada

J. Appl. Mech 58(3), 631-638 (Sep 01, 1991) (8 pages) doi:10.1115/1.2897242 History: Received June 15, 1989; Revised January 08, 1990; Online March 31, 2008


The void growth occurring during tensile testing of uniaxial and notched specimens of free-cutting brass has been determined experimentally. This material contains a globular lead phase which tears or bursts to nucleate voids during deformation. Using quantitative metallographic data from specimens whose deformation was interrupted prior to failure, histories of void volume fraction and void aspect ratio were determined. The measured stress-strain response from the tensile tests was shown to be close to predictions from a finite element model incorporating Gurson’s constitutive model for a porous plastic solid. Predicted void growth rates agreed well with experiment for uniaxial specimens but were less than the measured growth rates in notched, high triaxiality specimens.

Copyright © 1991 by The American Society of Mechanical Engineers
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