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ASTM Selected Technical Papers
Composite Materials: Testing and Design (Third Conference)
By
CA Berg
CA Berg
coordinator
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FJ McGarry
FJ McGarry
coordinator
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SY Elliott
SY Elliott
1
Douglas Aircraft Company
,
Long Beach, Calif. 90846
;
symposium chairman
.
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ISBN-10:
0-8031-0308-5
ISBN:
978-0-8031-0308-5
No. of Pages:
683
Publisher:
ASTM International
Publication date:
1974

Torsional fatigue data are presented for boron/epoxy and graphite/epoxy composites. The failure criterion for the tests is shear modulus reduction. The modulus reduction is shown to be caused by cracks that occur in resin-rich portions of the composites. Resistance to torsional fatigue is found to increase as fiber distribution becomes more uniform and as interfiber distance is decreased.

1.
Novak
,
R. C.
, “
Investigation of Graphite Filament Reinforced Epoxies
,” NASC Contract N00019-67-0-0354, Final Report,
1968
.
2.
Owen
,
M. J.
and
Morris
,
S.
, “
An Assessment of the Potential of Carbon Fibre Reinforced Plastics as Fatigue Resistant Materials
,” 24th Annual Conference, SPI,
1970
.
3.
Holmes
,
R. D.
and
Wright
,
D. W.
, “
Creep and Fatigue Characteristics of Graphite/Epoxy Composites
,” ASME Paper 70-DE-32,
1970
.
4.
Advanced Composites, Products and Capabilities Summary
,”
Hercules, Inc.
,
1972
.
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