Abstract
We performed the analytic, numerical, and experimental analyses of stresses in front of a sharp notch with an aim to establish a proper fracture criterion for the prediction of the onset of crack propagation from the notch. We reconsidered the Williams approach to the analysis of the general structure of the stress field. The finite-element method was used to deduce a formula for the stress concentration factor for a given geometry of the specimen. The method of caustics was used to obtain new relations for the stress concentration factors in front of the notch. We also carried out experimental investigations by the method of caustics and used the experimental data to postulate a fracture criterion.
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