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ASTM Selected Technical Papers
Eleventh Volume: Composite Materials—Testing and Design
By
ET Camponeschi, Jr Jr
ET Camponeschi, Jr Jr
editor
1
Naval Surface Warfare Center
Carderock Division
Annapolis, MD 21402 Symposium chairman and editor
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ISBN-10:
0-8031-1879-1
ISBN:
978-0-8031-1879-9
No. of Pages:
356
Publisher:
ASTM International
Publication date:
1993

Interlaminar fracture (delamination) is the dominant failure mechanism in most advanced composite materials. The resistance of a material system to delamination failure is generally quantified in terms of the interlaminar fracture toughness, Gc. The recently developed Mixed-Mode Bending (MMB) test is unique in that it facilitates measurement of the fracture toughness Gc under any combination of mixed-mode loading from pure Mode I to pure Mode II. This makes it a very attractive technique for developing interlaminar fracture failure criteria. This paper reports on an application of the MMB test to fatigue loading for the generation of Gc versus-curves and identification of the threshold value, Gth. Fatigue results from unidirectional IM7/5260 graphite/bismaleimide and IM7/8320 graphite/thermoplastic specimens are presented for a GI/GII ratio of 0.25. Static test results are also presented for both materials with the mode mix varying from pure Mode I to pure Mode II. The static results indicate different mixed mode failure laws for the two materials. All tests were conducted using displacement controlled loading under room temperature, dry conditions.

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,
R. H.
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,” NASA CR-187573,
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; also
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,
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,
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.
2.
Whitney
,
J. M.
,
Browning
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, and
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, “
A Double Cantilever Beam Test for Characterizing Mode I Delamination of Composite Materials
,”
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3.
Barrett
,
J. D.
and
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Mode II Stress Intensity Factors for Cracked Wood Beams
,”
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4.
Ramkumar
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and
Whitcomb
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,”
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, ASTM STP 876,
Johnson
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, Ed.,
American Society for Testing and Materials
,
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,
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5.
O'Brien
,
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Mixed-Mode Strain Energy Release Rate Effects on Edge Delamination of Composites
,”
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, ASTM STP 836,
Wilkins
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, Ed.,
American Society for Testing and Materials
,
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,
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6.
Whitney
,
J. M.
and
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A Modified Free-Edge Delamination Specimen
,”
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, ASTM STP 876,
Johnson
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, Ed.,
American Society for Testing and Materials
,
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,
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, pp. 298–314.
7.
Arcan
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M.
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8.
Bradley
,
W. L.
and
Cohen
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, “
Matrix Deformation and Fracture in Graphite Reinforced Epoxies
,”
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, ASTM STP 876,
Johnson
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, Ed.,
American Society for Testing and Materials
,
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,
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, pp. 389–410.
9.
Hashemi
,
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,
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,
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, and
Williams
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,“
Interlaminar Fracture of Composite Materials
,”
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, Vol.
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,
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,
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,
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10.
Reeder
,
J. R.
and
Crews
,
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 Jr.
, “
Mixed-Mode Bending Method for Delamination Testing
,”
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11.
Reeder
,
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and
Crews
,
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 Jr.
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Non-linear Analysis and Re-design of the Mixed Mode Bending Delamination Test
,”
Proceedings of ICCM-VIII
,
Hawaii
,
07
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; also NASA TM-102777.
12.
Carlsson
,
L. A.
and
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,
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,
Experimental Characterization of Advanced Composite Materials
, Ch. 13,
Prentice Hall
,
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, pp. 157–192;
also, “
A Protocol for Interlaminar Fracture Testing
” prepared by ASTM Task Group D30.06.04.
13.
Jurf
,
R. A.
and
Pipes
,
R. B.
, “
Interlaminar Fracture of Composite Materials
,”
Journal of Composite Materials
, Vol.
16
,
1982
, pp. 386–394.
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