Abstract
AbstractThe direct current potential drop method is used to determine the depth of surface cracks in laboratory crack growth experiments. In the present paper calibration tests are described which were done on tensile loaded flat plates containing centrally located surface cracks. The cracks were propagated by fatigue loads and the load shedding technique was used to obtain beach marks on the fracture surface which were needed to calibrate the potential drop readings. Since the resolution of the direct current potential drop method is very low in the case of surface cracks the experimental parameters were optimized such that the accuracy of the crack depth determination can be about ± 1 per cent of the specimen thickness.
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