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A series of round-robin predictions of fatigue crack life have been conducted since 1976 by ASTM Task Group E24.06.01 on Application of Fracture Data to Life Prediction. The primary objective of these round-robin exercises was to investigate (1) if the compact type (CT) specimen constant-amplitude fatigue-crack-growth-rate data could be used to predict the growth behavior and lives of part-through crack (PTC) specimens under constant amplitude loading, and (2) if center-crack-tension (CCT) specimen constant-amplitude fatigue-crack-growth-rate data could be used to predict the growth behavior and lives of CCT specimens subjected to variable amplitude and random spectrum loadings. Five sets of round-robin predictions were conducted on a total of 57 specimens that were made of three materials: 2219-T851 aluminum, 6Al-4V titanium, and 9Ni-4Co-0.2C steel. This paper summarizes the results of these round-robin analytical predictions and their correlations to test data.
fatigue (materials), cracking, fatigue life, compact type specimen, center crack tension specimen, part-through crack specimen, constant amplitude fatigue crack growth rate data, variable amplitude loading, random spectrum loading, 2219-T851 aluminum, 6Al-4V titanium, 9Ni-4Co-0.2C steel, round-robin analysis
Engineering specialist, The Aerospace Corporation, Los Angeles, CA