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RESEARCH PAPERS

JIc Determination Using the Proposed Standard C-Shaped Specimen

[+] Author and Article Information
C. H. LaForce, J. Morrison

Defence Research Establishment Valcartier, Courcelette, Quebec, Canada

J. Eng. Mater. Technol 100(3), 248-252 (Jul 01, 1978) (5 pages) doi:10.1115/1.3443486 History: Received January 03, 1978; Revised February 15, 1978; Online August 17, 2010

Abstract

The proposed standard C-shaped Specimen for KIc determinations according to ASTM E399 is readily adaptable to load line deflection measurement, and thus to J-integral assessment, using procedures currently being developed for other geometries. Tests have been conducted on quenched and tempered steels to provide comparisons of JIc and KIc using both C-shaped and compact tension specimens. The effect of specimen thickness on the crack growth resistance curve and JIc has also been examined and analyzed in relation to the allowed thickness range for the proposed test method. The Merkle and Corten corrections for the C-shaped Specimen have been calculated and compared to those for other specimen geometries. J estimates based on total displacement measurements have been found to be acceptable even at short relative crack depths.

Copyright © 1978 by ASME
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