Hydrogen-assisted fracture at notches

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Abstract
Although notched specimens have been much used in studies of hydrogen embrittlement, precracked–specimen testing has become more widespread in the last 15 years or so. However, recent work has revived interest in the use of notched specimens for fundamental studies. The background for, and recent results from, the use of notched specimens is described, and current problems in the interpretation of fracture behaviour are discussed. Of particular interest are the questions relating to the appropriateness of assuming a critical, local hydrogen concentration for fracture and to the degree of fracture control by stress, strain, or some combination. An encouraging development is the recent convergence in interests between micromechanism studies by materials scientists and work on the parameters of microfracture by the mechanics community. MST/74