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Effective crack lengths by compliance measurement for ARALL-2 laminatesAs a means of determining a stress intensity factor solution, the compliance properties of an ARALL-2 laminated-sheet composite were investigated. Fatigue crack growth rate (FCGR) tests were conducted on middle crack tension (MT) specimens fabricated from a layup consisting of three sheets of 2024-T3 aluminum bonded together with unidirectional aramid fibers embedded in epoxy. Excellent fatigue crack growth properties are obtained by the presence of unbroken aramid fibers in the wake of the crack tip. These unbroken fibers act as a bridging mechanism to inhibit further crack growth. To quantify the effect of maximum fatigue load on compliance, a series of FCGR tests were performed. Effective crack lengths were determined to be at least 10 mm shorter than surface measured crack lengths for a 76-mm-wide specimen. The bridging zone was estimated to be at least 5 mm. Compliance and stress intensity factor as functions of effective crack length were determined.
Document ID
19920056416
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Wilson, Christopher D.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Wilson, Dale A.
(Tennessee Technological University Cookeville, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
Structural Mechanics
Accession Number
92A39040
Distribution Limits
Public
Copyright
Other

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