31 March 1998 POD measurement using actual components
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Abstract
Advantages and limitations of different approaches to determine probability of detection are provided and a practical and economical approach based on using actual components with real flaws is described. Important factors that affect POD measurements are mentioned and POD results generated on engine components with service-induced fatigue cracks using different inspection techniques, both manual and automated, are presented. It is found that the majority of service induced cracks, in the engine parts investigated, are small corner cracks that are difficult to simulate and detect while laboratory-grown cracks tend to form as through cracks that are easier to detect. The most widely used liquid penetrant and magnetic particle inspections (LPI and MPI) are not very effective in detecting service cracks in the bolt holes of engine components as indicated by the POD- crack size relationships and the crack sizes detectable at 90 percent POD with 95 percent confidence level. Eddy current techniques, in particular automated eddy current, are more suitable and should be used in place of, or in addition to the traditional LPI and MPI for such applications.
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Abbas Fahr, Abbas Fahr, David S. Forsyth, David S. Forsyth, } "POD measurement using actual components", Proc. SPIE 3397, Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware II, (31 March 1998); doi: 10.1117/12.305053; https://doi.org/10.1117/12.305053
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