Elastic-Plastic Fracture Toughness: A Comparison of J-Integral and Crack Opening Displacement Characterizations

[+] Author and Article Information
C. A. Griffis

Strength of Metals Branch, Engineering Materials Div., Naval Research Lab., Washington, D. C.

J. Pressure Vessel Technol 97(4), 278-283 (Nov 01, 1975) (6 pages) doi:10.1115/1.3454308 History: Received March 31, 1975; Online October 25, 2010


The geometry dependence of the J-integral and crack opening displacement at fracture initiation, Ji and (COD)i , is examined for HY-80 steel using precracked bend specimens having thicknesses ranging from 1.6 to 53mm. The amount of crack growth at selected points on the load-deflection diagram was delineated using an unload-heat tint procedure. Resistance curves of J and COD versus crack extension were constructed to determine critical values of these parameters at incipient crack movement. Results are interpreted in terms of previously proposed minimum size requirements for valid Ji measurement. The adequacy of the Rice-Srawley J-integral formula for the bend specimen and the utility of J and COD values at maximum load are also considered.

Copyright © 1975 by ASME
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