The Determination of the J-Integral on Precracked Charpy Specimens by Instrumented Impact Testing and Slow-Bend Testing

[+] Author and Article Information
P. Nguyen-Duy, G. Phelippeau, R. Simoneau, G. Begin

Institut de Recherche de l’Hydro-Quebec (IREQ), Varennes, Quebec

J. Eng. Mater. Technol 100(3), 253-257 (Jul 01, 1978) (5 pages) doi:10.1115/1.3443487 History: Received February 21, 1978; Revised March 21, 1978; Online August 17, 2010


The fracture criterion JIC is determined on SA-516-70 steel using precracked CVN specimens. The addition of an appropriate side-groove results in a better plane-strain condition at the crack tip and removes a major part of the absorbed energy due to lateral deformation. The value of JIC static is calculated from a single three-point-bend experiment. The displacement of the cracked front is followed by the measurement of the electrical resistance. We have shown that a single specimen is sufficient for determining JIC . Experiments on an instrumented Charpy machine were used for the calculation of the value of JICD . We assumed, for elasto-plastic behavior, that the maximum point of the load-displacement curve corresponds to the instability threshold of the crack. The values of JIC and JICD obtained by these two methods are compared and discussed.

Copyright © 1978 by ASME
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