SYMPOSIA PAPER Published: 01 January 1995

A Comparison of and CTOD as Elastic-Plastic Fracture Characterizing Parameters


This paper presents results of experimental and numerical analysis studies to investigate the relationship between J and CTOD and assess whether they are, indeed, both suitable elastic-plastic fracture characterizing parameters. Detailed elastic-plastic finite element analyses were undertaken for SE(B) specimens with a/W ratios of 0.1, 0.2, 0.3 and 0.5. Analyses were performed for a range of material stress-strain curves and yield strength levels to determine the influence of work hardening and yield strength on the J-CTOD relationship.

It was found that: 1. The standard CTOD estimation procedure can give rise to significant errors in the predicted CTOD for high work hardening materials (σTSYS > 1.5) .2. For SE(B) specimens, the following J-CTOD correlation can be used to relate J to CTOD J=mTSσTSCTOD where mTS = 1.21 + 0.95 (a/W) − 0.5 (a/W)2. 3. J and CTOD do not always produce consistent trends when used to characterize the fracture toughness of different materials, i.e., the toughness ranking based on J is not necessarily the same as the ranking obtained using CTOD.

Author Information

Gordon, JR
Edison Welding Institute, Columbus, OH
Neale, BK
Nuclear Electric, CEGB, Berkeley Nuclear Laboratories, Berkeley, Gloucester, U.K.
Wang, Y-Y
Edison Welding Institute, Columbus, OH
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Developed by Committee: E08
Pages: 425–444
DOI: 10.1520/STP14645S
ISBN-EB: 978-0-8031-5305-9
ISBN-13: 978-0-8031-2013-6