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ASTM Selected Technical Papers
Composite Materials: Fatigue and Fracture, Fourth Volume
By
W Stinchcomb
W Stinchcomb
1
Virginia Polytechnic Institute and State University and the U.S. Air Force Academy
;
symposium chairman and editor
Search for other works by this author on:
N Ashbaugh
N Ashbaugh
2
University of Dayton, Research Institute
,
Dayton, OH
;
symposium chairman and editor
Search for other works by this author on:
ISBN-10:
0-8031-1498-2
ISBN:
978-0-8031-1498-2
No. of Pages:
6608
Publisher:
ASTM International
Publication date:
1993

This paper details the analytical and experimental work required to predict delamination onset and growth in a curved cross-plied composite laminate subjected to static and fatigue loads. The composite used was AS4/3501-6, graphite/epoxy. Analytically, a closed-form stress analysis and 2-D and 3-D finite element analyses were conducted to determine the stress distribution in an undamaged curved laminate. The finite element analysis was also used to determine values of strain energy release rate at a delamination emanating from a matrix crack in a 90° ply. Experimentally, transverse tensile strength and fatigue life were determined from flat 90° coupons. The interlaminar tensile strength and fatigue life were determined from unidirectional curved laminates. Also, Mode I fatigue and fracture toughness data were determined from double cantilever beam specimens. Crossplied curved laminates were tested statically and in fatigue to give a comparison to the analytical predictions. A comparison of the fracture mechanics life prediction technique and the strength-based prediction technique is given. Generally, both prediction techniques gave good comparisons with the experimental results.

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,”
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,
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,
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,”
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,
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,
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,
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, “
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,” this publication. Also published as NASA TM 104076,
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American Society for Testing and Materials
,
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,
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American Society for Testing and Materials
,
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,
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10.
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and
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11.
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Characterizing Mode I Fatigue Delamination of Composite Materials
,”
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,
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,
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12.
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and
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,”
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,
Paisley, Scotland
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A Virtual Crack-Closure Technique for Calculating Stress Intensity Factors for Cracked Three Dimensional Bodies
,”
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, Vol.
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15.
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,
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and
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, “
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,”
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,
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16.
Chang
,
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17.
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,
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,”
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,
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18.
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,
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19.
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,
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,
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, pp. 3–11.
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