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ASTM Selected Technical Papers
Composite Materials: Testing and Design (Fourth Conference)
By
JG Davis, Jr Jr
JG Davis, Jr Jr
1
National Aeronautics and Space Administration-Langley Research Center
,
Hampton, Va. 23665
;
conference chairman
.
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ISBN-10:
0-8031-4490-3
ISBN:
978-0-8031-4490-3
No. of Pages:
540
Publisher:
ASTM International
Publication date:
1977

The results of an experimental investigation on the fracture behavior of unidirectional and multidirectional laminated graphite/epoxy composites is reported. Critical tensile fracture stresses for constant head rate uniaxial specimens containing single-edge notches, double-edge notches, and centrally located circular holes are presented. Results are reported for loads and notches at various angles to the fiber direction(s). Evidence of notch sensitivity and stable crack growth is presented. Self-similar crack growth is shown to occur for only a limited set of circumstances.

Critical stresses are compared to the theories of Waddoups et al and Whitney et al. These comparisons are presented using isotropic and orthotropic stress concentration factors together with a finite width correction factor. The results tend to show that use of only isotropic correction factors allow good correlation between theory and experiment.

1.
Sih
,
G. C.
, “
Handbook of Stress Intensity Factors
,”
Institute of Fracture and Solid Mechanics, Lehigh University
,
Bethlehem, Pa.
,
1973
.
2.
Sih
,
G. C.
and
Paris
,
P. C.
in
Fracture Toughness Testing and Its Applications
, ASTM STP 381,
American Society for Testing and Materials
,
04
1965
, pp. 30-81.
3.
Waddoups
,
M. E.
,
Eisenmann
,
J. R.
, and
Kaminski
,
B. E.
,
Journal of Composite Materials
 0021-9983, Vol.
5
,
10
1971
, p. 446.
4.
Cruse
,
T. A.
,
Journal of Composite Materials
 0021-9983, Vol.
7
,
04
1973
, p. 218.
5.
Nuismer
,
R. J.
and
Whitney
,
J. M.
,
Journal of Composite Materials
 0021-9983, Vol.
8
,
07
1974
, pp. 253-265.
6.
Whitney
,
J. M.
and
Nuismer
,
R. J.
in
Fracture Mechanics of Composites
, ASTM STP 593,
American Society for Testing and Materials
,
1975
, pp. 117-142.
7.
Wu
,
E. M.
,
Journal of Composite Materials
 0021-9983, Vol.
6
,
10
1972
, p. 472.
8.
Wu
,
E. M.
,
Composite Materials
,
Broutman
L. J.
and
Krock
R. H.
, Eds., Vol.
5
,
Fracture and Fatigue
,
Broutman
L. J.
, Ed.,
Academic Press
,
New York
,
1974
.
9.
Sih
,
G. C.
and
Chen
,
E. P.
,
Journal of Composite Materials
 0021-9983, Vol.
7
,
04
1973
, p. 230.
10.
Sih
,
G. C.
and
Chen
,
E. P.
, “
Fracture Analysis of Unidirectional and Angle Ply Composites
,” Technical Report NADC-TR-73-1,
Lehigh University
, Bethlehem, Pa.,
01
1973
.
11.
Kulkarni
,
S. V.
and
Rosen
,
B. W.
, “
Design Data for Composite Structure Safelife Prediction: Analysis Evaluation
,” Technical Report TFR/2221,
Materials Science Corporation
,
08
1973
.
12.
Durchlaub
,
E. C.
and
Freeman
,
R. B.
, “
Design Data for Composite Structure Safelife Prediction
,”
Boeing Vertol Co. Report
, D210-10671-2, Vol.
II
, AFML-TR-73-225,
08
1973
.
13.
Kanninen
,
M. R.
,
Rybicki
,
E. G.
and
Griffith
,
W. F.
, this publication, pp. 53-69.
14.
Paris
,
P. C.
and
Sih
,
G. C.
in
Fracture Toughness Testing and Its Application
, ASTM STP 381,
American Society for Testing and Materials
,
04
1955
, pp. 30-83.
15.
Griffith
,
A. A.
, “
The Phenomena of Rupture and Flow of Solids
,”
Philosophical Transactions of the Royal Society
, Vol.
221A
,
1920
.
16.
Williams
,
D. P.
and
Ramani
,
S.
, private communication, June, 1975.
17.
Konish
,
H. J.
and
Cruse
,
T. A.
in
Composite Reliability
, ASTM STP 580,
American Society for Testing and Materials
,
1975
, pp. 490-503.
18.
Brinson
,
H. F.
and
Yeow
,
Y. T.
, “
An Investigation of the Failure and Fracture Behavior of Graphite/Epoxy Laminates
,” Technical Report VPI-E-75-23,
Virginia Polytechnic Institute and State University
, Blacksburg, Va.,
09
1975
.
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