The extension of semielliptical surface cracks in plates under cyclic tension and cyclic bending loading has been investigated. The analytical results compared different assumptions, applying local and weighted averaged ΔK values and the effect of crack closure. The experimental results showed that the developing crack front can be described fairly accurately by semiellipses. Applying local ΔK values for the prediction underestimates the developing crack aspect ratio a/c. Applying the weighted averaged ΔK or a crack closure factor improves the prediction.
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