The growth of small cracks in 4340 steelA semiempirical crack-growth model incorporating crack-closure effects has been used to predict crack growth rates and total fatigue life in notched specimens of 4340 steel having an initial defect typical of those previously noted in this steel upon subjection to both constant-amplitude and spectrum loadings. Model predictions for fatigue life are found to be in reasonable agreement with experiments and, in particular, the model was able to accurately predict total fatigue life for specimens subjected to the 'Felix/28' spectrum loading sequence on the sole basis of constant-amplitude test test results.
Document ID
19890042085
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Swain, M. H. (Planning Research Corp. Hampton, VA, United States)
Everett, R. A., Jr. (NASA Langley Research Center; U.S. Army, Aviation Research and Technology Activity, Hampton VA, United States)
Newman, J. C., Jr. (Planning Research Corp. Hampton, VA, United States)
Phillips, E. P. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1988
Subject Category
Metallic Materials
Meeting Information
Meeting: National Technical Specialists'' Meeting on Advanced Rotorcraft Structures