SYMPOSIA PAPER Published: 01 January 1993

Level-3 Crack-Tip Opening Displacement (CTOD) Assessment of Welded Wide Plates in Bending—Effect of Overmatching Weld Metal


Butt-welded wide plates with semi-elliptical surface cracks along the fusion line were tested in four-point bending. The material was normalized low-carbon microalloyed steel that conformed to offshore specifications. The testing temperature was in the range of -40° to 0°C. The test results were analyzed by the crack-tip opening displacement (CTOD) Level-3 method that compared different assumptions for the reference strain in order to assess the effect of overmatching weld metal. The original Level-3 plane stress model and a proposed plane strain model with a modified definition of effective primary stress were compared. Consistent results were obtained by the latter method. A detailed finite-element method (FEM) model was validated, and results from comprehensive analyses of welded and nonwelded models are presented.

Author Information

Berge, S
The Norwegian Institute of Technology, Trondheim, Norway
Eide, OI
SINTEF, Trondheim, Norway
Fujikubo, M
Hiroshima University, Hiroshima, Japan
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Developed by Committee: E08
Pages: 284–309
DOI: 10.1520/STP24274S
ISBN-EB: 978-0-8031-5241-0
ISBN-13: 978-0-8031-1867-6