Virtual Bookstore Citation Title FRACTOGRAPHIC ANALYSIS OF HIGH-CYCLE FATIGUE IN AIRCRAFT ENGINES Author(s) Shockey, Donald A.; Kobayashi, Takao; Saito, Naoki; Aubry, Jean-Marie; Grunbaum, Alberto Corporate Author(s) SRI INTERNATIONAL MENLO PARK CA Report Date 1/1/2000 Page Count 126 Abstract A seedling program was conducted to determine whether load information is stored in the fracture surface features of failed aircraft components and, if so, to explore methods for extracting this information. Fracture surfaces produced under systematically varied cyclic load conditions in laboratory specimens of titanium turbine blade alloy were provided to the program by an aircraft engine manufacturer. Three-dimensional topographs of the surfaces were obtained via confocal optics and microscopy and analyzed with Fourier and wavelet techniques. Both analysis techniques confirmed the existence of load information in the fracture surface topography. Moreover, correlation was found between Fourier results and fatigue load parameters. The topographic characterization and analysis method was then applied to an F-118 engine component that had cracked in service to determine whether the load history that caused the cracking could be extracted. Using the results from the laboratory specimens as a reference database, the method provided a quantitative estimate of an influential fatigue load parameter and indicated its variation with crack growth distance. Price: $9.95 Available as PDF for download.   Prices are plus sales tax when purchased within New York State and shipping charges, if applicable