Abstract
The paper outlines a new, and very simple, J- integral estimation scheme which is based on the representation of J DP , the plastic component of the deformation J- integral J D , as a linear combination of the plastic energy and complementary plastic energy integrals, and the use of eta factors. A characteristic of the scheme is that it is exact at the two extremes: small-scale yielding and extensive deformation at limit load conditions. Determination of the eta factors requires only a knowledge of the limit load solution and the crack tip stress intensity. The paper shows how the new scheme relates to existing schemes: the GE-EPRI scheme and the CEGB-R6 scheme.
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