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A slice synthesis methodology is used to construct a modified strip-yield model for the part-through semi-elliptical surface flaw, enabling prediction of plasticity-induced closure along the crack front and subsequent fatigue crack growth. Predictions of flaw shape evolution under cyclic loading are compared with experimental data for steel specimens under constant-amplitude cyclic bending. Model predictions are shown to correlate well with experimental data. The influence of stress level and mean stress on surface flaw shape evolution is evaluated.
fatigue, crack propagation, surface flaw, part-through flaw, crack closure, plasticity-induced closure
Assistant professor, Mississippi State University, Mississippi State, MS