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ASTM Selected Technical Papers
Delamination and Debonding of Materials
By
WS Johnson
WS Johnson
1
NASA Langley Research Center
,
Hampton, Virginia 23665
;
symposium chairman and editor
Search for other works by this author on:
ISBN-10:
0-8031-0414-6
ISBN:
978-0-8031-0414-3
No. of Pages:
513
Publisher:
ASTM International
Publication date:
1985

The critical strain energy release rates for interlaminar fracture of unidirectional graphite/epoxy, both from a sharp notch and as a function of crack extension, were determined experimentally for combined tensile/shear loadings. Based on well-founded compliance techniques, a substantial database was generated over the temperature range −50°C to 100°C for both dry and moisture-saturated states. The fracture energy of the unreinforced epoxy matrix material was also measured. Initiation energies for delamination increased as the proportion of shear loading increased and as the temperature was lowered but were insensitive to moisture content. The fracture resistance to crack extension increased under tensile dominated loadings with both temperature and moisture content but remained constant for high shear loadings. The applicability of various mixed-mode fracture criteria to both the present data and to available literature data is examined. The Wu fracture model was modified to take into account plane strain conditions appropriate to delamination. Crack growth resistance behavior is discussed in terms of the micromechanisms occurring close to the crack tip.

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,
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American Society for Testing and Materials
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6.
Wilkins
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A Comparison of the Delamination and Environmental Resistance of a Graphite-Epoxy and a Graphite-Bismaleimide
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General Dynamics
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7.
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9.
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14.
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American Society for Testing and Materials
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21.
Russell
,
A. J.
and
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, “
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Defence Research Establishment Pacific
, Victoria, B.C., Canada,
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.
22.
Brown
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W. F.
and
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,
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23.
Adams
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D. F.
and
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,
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24.
Wang
,
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,
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N. N.
, and
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,
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,
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25.
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27.
Lauraitis
,
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, “
Tensile Strength of Off-Axis Unidirectional Composites
,” T&AM Report 344,
Department of Theoretical and Applied Mechanics, University of Illinois
, Urbana,
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28.
Tennyson
,
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,
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29.
Tsai
,
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30.
Wu
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in
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, Vol.
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,
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31.
Sidey
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G. R.
and
Bradshaw
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in
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,
The Plastics Institute
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32.
Russell
,
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, “
Factors Affecting the Opening Mode Delamation of Graphite/Epoxy Laminates
,” DREP Materials Report 82-Q,
Defence Research Establishment Pacific
, Victoria, B.C., Canada,
1982
.
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