Abstract
This paper proposes a procedure based on crack tip opening displacement (CTOD) to define the boundary of the small-scale yielding (SSY) regime. Numerical modelling was applied to notched samples with different notch radii, under both plane stress and plane strain conditions, with and without crack flank contact. Results indicate that an increase in notch radius promotes the validity of SSY. The increase in crack length promotes a progressive decrease of SSY's validaty, particularly in notched specimens. Most of the situations studied fall outside the SSY regime, which reinforces the importance of verifying the applicability of LEFM to fatigue crack growth rate calculations.
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