Issues in the Determination of Default POD for Hard‐Alpha Inclusions in Titanium Rotating Components for Aircraft Engines

Recent progress towards updating the Default POD estimates that are used in determining the initial exceedance curves for rotating titanium components intended for aircraft engine use is described. The approach, based on the Re technique used in the generation of the original default POD curves is first described. A modified preliminary POD estimate is then presented based on incorporating new data sets into the analysis. The result predicts a significant shift in the POD curves to larger flaw sizes. However, the data suggest that the Re technique needs modification. Included is an examination of the basic assumption that flaw response is directly proportional to flaw area and the degree to which this is supported by experimental data. Future work will be directed towards development and application of a modified analysis technique.