SYMPOSIA PAPER Published: 01 January 1988
STP23273S

A Comparison of J-Integral and CTOD as Fracture Toughness Parameters

Source

The J-integral and the crack-tip opening displacement (CTOD) are widely used throughout the world to measure the fracture toughness of structural materials. There are many similarities between these two parameters, as well as a number of important differences. Because of these differences, the CTOD parameter tends to be more conservative when applied to structures.

The J-integral and CTOD were compared qualitatively and analytically. This work differs from previous comparisons in that the present study compared engineering estimates of J and CTOD, which are not necessarily equal to the true values of J and CTOD. However, the fracture toughness of a material is nearly always characterized in terms of the engineering approximations of J or CTOD.

The main difference between J and CTOD as measures of toughness is that J is directly proportional to the area under the load-displacement curve whereas CTOD is proportional to the clip gage displacement. This means that the relationship between the two parameters depends on strain hardening and constraint.

Author Information

Anderson, TL
Texas A & M University, College Station, TX
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Details
Developed by Committee: E08
Pages: 741–753
DOI: 10.1520/STP23273S
ISBN-EB: 978-0-8031-5036-2
ISBN-13: 978-0-8031-0949-0