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RESEARCH PAPERS

Approximate Models for Ductile Metals Containing Nonspherical Voids—Case of Axisymmetric Oblate Ellipsoidal Cavities

[+] Author and Article Information
Mihai Gologanu, Jean-Baptiste Leblond

Laboratoire de Modélisation en Mécanique, Université Paris VI, Tour 66, 4 place Jussieu, 75252 Paris Cedex 05, France

Josette Devaux

FRAMASOFT + CSI, 10 rue Juliette Récamier, 69456 Lyon Cedex 06, France

J. Eng. Mater. Technol 116(3), 290-297 (Jul 01, 1994) (8 pages) doi:10.1115/1.2904290 History: Received August 03, 1993; Revised January 29, 1994; Online April 29, 2008

Abstract

The aim of this paper is to extend the classical Gurson (1977) analysis of a hollow rigid ideal-plastic sphere loaded axisymmetrically to an ellipsoidal volume containing a confocal oblate ellipsoidal cavity. An “expansion” velocity field satisfying conditions of homogeneous boundary strain rate is used to derive a two-field estimate of the overall yield criterion. The latter is shown to be reducible, with a few approximations, to a Gurson-like criterion depending on the “shape parameter” of the cavity. The accuracy of this estimate is assessed through comparison with some results derived from a numerical minimization procedure. An approximate evolution equation for the shape parameter is also presented; comparison with some finite element simulations suggests a slight modification of the theoretical formula leading to considerably enhanced agreement.

Copyright © 1994 by The American Society of Mechanical Engineers
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