Growth patterns of surface fatigue cracks under cyclic bending—a quantitative analysis

Abstract Growth patterns of surface cracks in plates subjected to cyclic bending are examined experimentally and theoretically. Different methods of prediction of the aspect ratio variability of these surface cracks are compared with experimental data. The objective is to identify the most accurate method. The comparison is based on a quantitative criterion as well as on statistical examination of the level of agreement with the data. Fifty cracks are analysed. The total number of data points is 523 taken from 15 references. The solutions evaluated include theoretical as well as empirical formulae. The comparison shows that it is possible to predict the aspect ratio variability with standard deviation in the order of 0.090.

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