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A crack opening stress equation for fatigue crack growthA general crack opening stress equation is presented which may be used to correlate crack growth rate data for various materials and thicknesses, under constant amplitude loading, once the proper constraint factor has been determined. The constraint factor, alpha, is a constraint on tensile yielding; the material yields when the stress is equal to the product of alpha and sigma. Delta-K (LEFM) is plotted against rate for 2024-T3 aluminum alloy specimens 2.3 mm thick at various stress ratios. Delta-K sub eff was plotted against rate for the same data with alpha = 1.8; the rates correlate well within a factor of two.
Document ID
19840050000
Document Type
Reprint (Version printed in journal)
Authors
Newman, J. C., Jr. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 12, 2013
Publication Date
April 1, 1984
Publication Information
Publication: International Journal of Fracture
Volume: 24
ISSN: 0376-9429
Subject Category
STRUCTURAL MECHANICS
Distribution Limits
Public
Copyright
Other