Abstract
The reliabilities of various methods for the determination of J R curves from single-specimen test data have been investigated by employing two types of specimens (CT and CCT) made of three materials—aluminium alloy LY12CZ, steel 30CrMnSiA and steel 45A. The instantaneous crack lengths were measured directly by an eddy-current automatic tracking apparatus, and compared with the values calculated by different methods. Merits and shortcomings of the above-mentioned methods, as well as factors affecting their applicabilities, have been analyzed on the basis of these comparisons. The J R curves for the three tested materials have been obtained thereby.
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