Abstract
A material-dependent critical value of the energy integral J is widely accepted as a criterion for crack growth initiation, although the energy release rate does not always coincide with J. Crack advance in elastic-plastic materials involves both crack separation and energy dissipation by yielding around the crack front. A plastic zone is formed upon loading with additional energy being dissipated during crack extension. The objective of the present paper is to evaluate the different components of the whole energy dissipation rate and to discuss their effect on stable crack advance in fracture toughness testing. Limits of J-controlled crack growth and geometry invariance of the crack growth resistance curves are analysed. Data points beyond crack tip blunting satisfying the validity limits should be fitted by nonlinear resistance curves J = (A + CΔa) 1 2 .
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