SYMPOSIA PAPER Published: 01 January 1989

A Comparison of Crack-Tip Opening Displacement Ductile Instability Analyses


This paper presents the results of a large test program undertaken to study ductile fracture in aluminum weldments. The main body of the experimental program consisted of a series of wide-plate tests on 10-mm-thick parent material and welded aluminum alloy center-cracked panels. In addition to the wide-plate tests, tension, and single-specimen unloading compliance, R-curve tests were conducted on specimens extracted from the various parent materials and weld metals.

The wide-plate tests were analyzed using a crack-tip opening displacement (CTOD) strip yield model, a CTOD reference stress model, and the CTOD equivalent of the J estimation scheme published by the Electric Power Research Institute. It was found that all three models provided reasonably accurate predictions of maximum far-field stress if a representative CTOD R-curve was incorporated in the analysis.

Author Information

Gordon, JR
Edison Welding Institute, Columbus, OH
Garwood, SJ
The Welding Institute, Abington Hall, Abington, United Kingdom
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Developed by Committee: E08
Pages: 410–430
DOI: 10.1520/STP18835S
ISBN-EB: 978-0-8031-5081-2
ISBN-13: 978-0-8031-1250-6