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Stress-Ratio Effect on Mode II Propagation of Interlaminar Fatigue Cracks in Graphite/Epoxy Composites / K. Tanaka, H. Tanaka

Conference Author
Composite Materials: Fatigue and Fracture (Sixth Volume) (6th : 1995 : Denver, Colorado)
Physical Description
1 online resource (17 pages) : illustrations, figures, tables
Additional Creators
Tanaka, H, Tanaka, K., American Society for Testing and Materials, and ASTM International
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Summary
The effect of the stress ratio on the propagation behavior of Mode II interlaminar fatigue cracks was studied with unidirectional graphite/epoxy laminates, Toray T800H/#3631. End-notched flexure (ENF) specimens were used for fatigue tests under the stress ratios of R = 0.2, 0.5, and 0.6; and end-loaded split (ELS) specimens were used for tests under R = -1.0, -0.5, and 0.2. For each stress ratio, the crack propagation rate was given by a power function of the stress intensity range, ?KII, in the region of rates above 10-9 m/cycle. Below this region, there exists the threshold for fatigue crack propagation. The threshold condition is given by a constant value of the stress intensity range, ?KIIth = 1.8 MPa?m. The crack propagation rate is determined by ?KII near the threshold, while by the maximum stress intensity factor, KIImax at high rates. A fracture mechanics equation is proposed for predicting the propagation rate of Mode II fatigue cracks under various stress ratios. The effect of the stress ratio on the micromechanisms of Mode II fatigue crack propagation was discussed on the basis of the microscopic observations of fracture surfaces and near-crack-tip regions.
Dates of Publication and/or Sequential Designation
Volume 1997, Issue 1285 (January 1997)
Subject(s)
Other Subject(s)
ISBN
9780803153530 (e-ISBN)
9780803124110
0803124112
Digital File Characteristics
text file PDF
Bibliography Note
Includes bibliographical references 18.
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Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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Also available in PDF edition.
Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1997. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
Technical Details
Mode of access: World Wide Web.
Source of Acquisition
ASTM International PDF Purchase price USD25.
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