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Commonly used analysis methods for predicting “uniaxial” crack initiation and propagation lives in notched structural components are summarized. Experimental trends in the crack initiation and propagation behavior of notched laboratory specimens are presented and discussed in terms of the influence of such factors as notch stress concentration and stress gradient, nature of the loading, residual stress, etc. Conditions for which fatigue life tends to be governed by crack growth considerations are identified. A criterion for nonpropagating cracks is examined. Examples showing how design factors influence the selection of crack initiation or propagation approaches are given. Potential advantages of a better understanding of small crack behavior at notches are noted.
fatigue of metals, notches, crack initiation, crack propagation, residual stress, mean stress, nonpropagating cracks, fracture mechanics, small cracks, fatigue design, life prediction, stress concentration, stress gradient
Assistant Professor, Stanford University, Stanford, Calif.
Associate Professor, University of Illinois, Urbana, Ill.