Abstract
Transient fatigue crack growth effects following perturbations in applied loading conditions have been studied using a low strength plain C-Mn steel. Reductions in both the alternating and maximum components of the fatigue loading spectrum have been systematically investigated and evaluated using a linear elastic fracture mechanics approach. Results are discussed in terms of the residual stress concept, and a model based on an effective stress intensity concept is propossed to rationalise growth rates within the retardation affected zone. Using constant amplitude fatigue threshold and crack growth data obtained under similar conditions, the model is shown to be in good agreement with experimental data.
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