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Abstract
Fatigue crack propagation experiments on AA7475-T761 have been undertaken using a DC potential drop measurement for determining the crack length. The signal of the potential drop measurement was smoothed using a LOESS filter algorithm. This method enhances the detection limit for small fatigue cracks and allows to define a lower limit for the beginning of the crack propagation. The investigation of short fatigue cracks is difficult, because of the geometry of the short cracks emanating from both corners of the notch in form of quarter elliptical cracks. The crack propagation in the notch root is accelerated by a higher stress concentration compared to the crack propagation on the specimen flanks. The crack propagation in the notch root is impeded by the slower crack propagation on the specimen surface. Therefore, a 2-dimensional model for the description of the propagation of small fatigue cracks at notches has to be developed.
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