Abstract
The cyclic lifetime of components can be divided into crack initiation, short crack growth until a through-thickness crack has built up, followed by long crack growth until final failure. For lifetime calculations of technical alloys based on fracture mechanics the calculation normally is limited to the propagation of long cracks. Unfortunately, long crack propagation covers only a minor part of the total lifetime. The propagation of short cracks extends over more than half of the service life and is therefore the focus of a lot of studies.For all calculations and researches an accurate crack length measurement is necessary, especially for short crack growth. With a high-resolution DC potential drop measurement, a crack can be detected very early, but it is not possible to display the real shape and location of the initial crack. Hence, this would be necessary for a full-featured detection of short crack propagation.Attaching multiple DC potential probes near the crack initiation site an analysis of the location and shape of the short cracks is possible. This paper shows the possibilities of short crack detection with two potential probes mounted near the notch on SEN specimens.
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