Abstract
The behaviour of fatigue crack propagation in a high stress concentration area caused by a geometrical notch in the structure is studied. Low cycle fatigue tests in two kinds of materials and a total of six specimens of double-through cracks emanating from the edges of an elliptical hole were carried out. For reducing errors in the parameter calculation, a calculation formula for the stress intensity factor K of a finite width panel with double-through cracks emanating from the edges of a central elliptical hole is first established, and then, a large plastic zone correction method is introduced to take account of the elastic-plastic behaviour. Finite element analyses were carried out to confirm the accuracy of the formula and the method. Both the stress intensity factor K and the large plastic zone correction form of K are used as correlating parameters. The results show that the large plastic zone correction form of K developed by the present studies which successfully represents the J integral for the problem studied is a suitable parameter to explore the behaviour of fatigue crack propagation in a high stress concentration area.
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