Abstract
Fatigue tests in which the development of crack shape was studied with the a.c. field measurement technique have been conducted on semi-elliptical cracks growing in flat plate specimens under tension and bending stresses. The a.c. field measurement technique, which was used to measure the cracks, exploits the fact that high frequency alternating current tends to flow in a thin skin along the metal surface and the crack depths can be interpreted from the changes in the voltage distribution produced by the presence of a crack. In order to interpret the measured voltages so as to provide accurate estimates of the crack length and depth, a theoretical analysis of the a.c. field around a semi-elliptical crack is required. This analysis was used to interpret the measured voltages in terms of the changes in the crack shape. Finally the interpreted data on the changes in crack shape were then used to test the accuracy of various stress intensity factor solutions.
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