(Received 20 March 2000; accepted 5 December 2000)
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Standard test methods of mixed-mode fracture toughness still do not exist, even though a decrease of fracture toughness with increasing Mode II (shear components) has been observed for a number of steels. A J-estimation scheme for mixed-mode loaded single-edge notched specimens is therefore developed in this paper. In accordance with the ASTM Standard E 1820-99, the evaluation of the plastic part of J is based on the measurement of the dissipated plastic energy weighted by a ηpl-factor. Two different approaches for the ηpl-factor are derived. Factors from both showed good correlation with finite element calculations for the specific case of a compact-tension-shear specimen (C(TS)), Finally, a simple clip gage setup for the measurement of the crack-opening displacements needed for the evaluation of the dissipated plastic energy is presented. The problem of the qualification of the mixed-mode crack initiation data is not specifically addressed, but some general comments on this topic are given at the end of the paper.
German Aerospace Center DLR, Institute of Materials Research, Cologne,
University of Parma, Parma,
Stock #: JTE12251J