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Fracture mechanics parameters for small fatigue cracksThis paper presents a review of some common small-crack test specimens, the underlying causes of the small-crack effect, and the fracture-mechanics parameters that have been used to correlate or predict their growth behavior. This review concentrates on continuum mechanics concepts and on the nonlinear behavior of small cracks. The paper reviews some stress-intensity factor solutions for small-crack test specimens and develops some simple elastic-plastic J integral and cyclic J integral expressions that include the influence of crack-closure. These parameters were applied to small-crack growth data on two aluminum alloys, and a fatigue life prediction methodology is demonstrated. For these materials, the crack-closure transient from the plastic wake was found to be the major factor in causing the small-crack effect.
Document ID
19930048762
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Newman, J. C., Jr.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: Small-crack test methods (A93-32758 12-39)
Publisher: American Society for Testing and Materials
Subject Category
Structural Mechanics
Accession Number
93A32759
Distribution Limits
Public
Copyright
Other

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