Small Randomly Distributed Cracks in Corrosion Fatigue

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Abstract
Very small distributed cracks often can be observed on the surfaces subjected to corrosion fatigue. In some cases, the fracture process can be characterized by the interaction and connection of these small distributed cracks. An analysis of such a corrosion-fatigue fracture process is presented by combining the techniques of fracture mechanics, reliability analysis, and graphical display. Many small cracks are measured and their statistical distribution functions, with respect to their sizes and locations, are determined. Using these functions as input data and a condition of the connections of cracks, a statistical simulation of a corrosion fatigue process is performed and its fracture process is output on a two-dimensional graphical display of an x-y plotter. The graphical display facilitates the simulation. The distribution of corrosion fatigue lives can be derived for some cases. Abrupt acceleration of the fracture process by the connection of distributed cracks is demonstrated.

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