Speaker：Academician Jan D. Achenbach,Northwestern University
Time: Monday,2:00-3:15 p.m.,11th June
The reliability of a jet engine compressor rotor blade containing a fatigue crack has been assessed based on eddy current inspection (ECI) of both the actual rotor blade and bolt-hole specimens containing cracks of known lengths. The detection threshold and the probability of detection curve have been determined. A dynamic Bayesian network (DBN) model was used to quantify uncertainties. The model encompasses a realistic ECI response model, so that it is possible to consider all relevant inspection data types. Factors which contribute the most to the variation of crack length have been determined by sensitivity analysis, and have been calibrated using the field inspection data. Part of the inspection data was used to validate the calibrated model. Based on the control level for the reliability index bctrl = 3, and the reliability indices calculated from the calibrated model, the recommended interval for the first inspection has been determined as 1600h.