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ASTM Selected Technical Papers
Composite Reliability
By
EM Wu
EM Wu
1
Washington University
,
St. Louis, Mo. 63130
;
symposium chairman
.
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ISBN-10:
0-8031-0309-3
ISBN:
978-0-8031-0309-2
No. of Pages:
646
Publisher:
ASTM International
Publication date:
1975

The fiber performance and potential as a reinforcement for fiber composites of a special PAN-based graphite fiber were evaluated by testing the fiber's tensile properties in an epoxy matrix. Representative strand samples were taken from 30 spools (∼4 kg) of single-end, 1500-filament fiber to make over 5000 fiber-epoxy strand specimens using the filament-winding process. Characteristics studied were fiber uniformity, strength and modulus distributions at room and liquid nitrogen temperatures, stress-strain behavior, the effect of strain rate on fiber strength, and acoustic emission during tensile loading to failure. The fiber was found to have a 3570-MPa (517 ksi) failure stress, a 1.7 percent failure strain, a 206-GPa (30 × 106 psi) modulus, and a density of 1.77 Mg/m3 at 23 °C (73 °F). Liquid nitrogen temperature and various strain rates had no significant effect on fiber tensile properties.

1.
Chiao
,
T. T.
,
Moore
,
R. L.
, and
Walkup
,
C. M.
,
SAMPE Quarterly, Society of Aerospace Materials and Process Engineering
, Vol.
4
, No.
4
,
1973
, p. 7.
2.
Chiao
,
T. T.
and
Moore
,
R. L.
, “
A Room-Temperature-Curable Epoxy For Advanced Fiber Composites
,”
Proceedings
, Society of the Plastics Industry Reinforced Plastics/Composites Institute, 29th Annual Technical and Management Conference,
Washington D.C.
, 5–8 Feb. 1974.
3.
Chiao
,
T. T.
and
Moore
,
R. L.
,
Journal of Composite Materials
 0021-9983, Vol.
4
,
1970
, p. 118.
4.
Gloor
,
W. H.
, “
Estimation of True Fiber Modulus from Instron Data
,” AFML Report TM-MAN-68-15,
Air Force Materials Laboratory
, Dayton, Ohio,
1968
.
5.
Chiao
,
T. T.
and
Moore
,
R. L.
,
Journal of Composite Materials
 0021-9983, Vol.
6
,
1972
, p. 547.
6.
Chiao
,
T. T.
and
Moore
,
R. L.
,
Journal of Composite Materials
 0021-9983, Vol.
5
,
1971
, p. 124.
7.
Hamstad
,
M. A.
and
Chiao
,
T. T.
,
Journal of Composite Materials
 0021-9983, Vol.
7
,
1973
, p. 321.
8.
Chiao
,
T. T.
,
Wells
,
J. E.
,
Moore
,
R. L.
, and
Hamstad
,
M. A.
, “
Stress-Rupture Behavior of Strands of An Organic Fiber/Epoxy Matrix
,”
Proceedings
, ASTM 3rd Symposium on Composite Materials, Testing and Design,
Williamsburg, Va.
, 21–22 March 1973.
9.
Chiao
,
T. T.
,
Lepper
,
J. K.
,
Hetherington
,
N. W.
, and
Moore
,
R. L.
,
Journal of Composite Materials
 0021-9983, Vol.
6
,
1972
, p. 358.
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