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TECHNICAL PAPERS

Verification of a Cohesive Zone Model for Ductile Fracture

[+] Author and Article Information
Huang Yuan, Guoyu Lin, Alfred Cornec

Institute of Materials Research, GKSS Research Centre Geesthacht, Max-Planck-Straße, D-21502 Geesthacht, Germany

J. Eng. Mater. Technol 118(2), 192-200 (Apr 01, 1996) (9 pages) doi:10.1115/1.2804886 History: Received December 24, 1994; Revised July 10, 1995; Online November 27, 2007

Abstract

In the present paper, ductile crack growth in an aluminium alloy is numerically simulated using a cohesive zone model under both plane stress and plane strain conditions for two different fracture types, shear and normal modes. The cohesive law for ductile fracture consists of two parts—a specific material’s separation traction and energy. Both are assumed to be constant during ductile fracture (stable crack growth). In order to verify the assumed cohesive law to be suitable for ductile fracture processes, experimental records are used as control curves for the numerical simulations. For a constant separation traction, determined experimentally from tension test data, the corresponding cohesive energy was determined by finite element calculations. It is confirmed that the cohesive zone model can be used to characterize a single ductile fracture mode and is roughly independent of stable crack extention. Both the cohesive traction and the cohesive fracture energy should be material specific parameters. The extension of the cohesive zone is restricted to a very small region near the crack tip and is in the order of the physical fracture process. Based on the present observations, the cohesive zone model is a promising criterion to characterize ductile fracture.

Copyright © 1996 by The American Society of Mechanical Engineers
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