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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
.
Search for other works by this author on:
ISBN-10:
0-8031-4490-3
ISBN:
978-0-8031-4490-3
No. of Pages:
540
Publisher:
ASTM International
Publication date:
1977

The resistance method has been applied to graphite/epoxy composites. The method is based on the assumption that the damage growth at the crack tip can be modeled as a self-similar crack extension through compliance matching. Experimental data for center-cracked tension specimens reveal a linear relationship between crack-growth resistance and initial crack length. For the [0/±45]s laminate, the effective increment of crack length at fracture and the corresponding crack-growth resistance essentially are independent of initial crack length. The average amount of this crack extension in the [0/±45]2s and [0/±45]s laminates is higher than the values obtained from a best fit of fracture strength data reported in the literature. However, the present method results in an improved prediction of fracture strength for the [0/90/ ±45]s laminate.

1.
Fracture Toughness Evaluation by R-Curve Methods
, ASTM STP 527,
American Society for Testing and Materials
,
1973
.
2.
Gaggar
,
S.
and
Broutman
,
L. J.
,
Journal of Composite Materials
 0021-9983, Vol.
9
,
1975
, pp. 216-227.
3.
Eftis
,
J.
,
Jones
,
D. L.
and
Liebowitz
,
H.
,
Fracture Mechanics of Aircraft Structures
,
Liebowitz
H.
, Ed., AGARD-AG-176,
North Atlantic Treaty Organization
,
1974
, pp. 32-73.
4.
Chang
,
F. H.
,
Couchman
,
J. C.
,
Eisenmann
,
J. R.
, and
Yee
,
B. G. W.
, in
Composite Reliability
, ASTM STP 580,
American Society for Testing and Materials
,
1975
, pp. 176-190.
5.
Brown
,
W. F.
and
Srawley
,
J. E.
,
Plane Strain Crack Toughness Testing of High Strength Metallic Materials
, ASTM STP 410,
American Society for Testing and Materials
,
1966
.
6.
Tsai
,
S. W.
and
Hahn
,
H. T.
in
Inelastic Behavior of Composite Materials
, AMD Vol.
13
,
American Society of Mechanical Engineers
,
1975
, pp. 73-96.
7.
Cruse
,
T. A.
and
Osias
,
J. R.
, “
Exploratory Development on Fracture Mechanics of Composite Materials
,” AFML-TR-74-111,
Air Force Materials Laboratory
,
04
1974
.
8.
Waddoups
,
M. E.
,
Eisenmann
,
J. R.
, and
Kaminski
,
B. E.
,
Journal of Composite Materials
 0021-9983, Vol.
5
,
1971
, pp. 446-454.
9.
Nuismer
,
R. J.
and
Whitney
,
J. M.
in
Fracture Mechanics of Composites
, ASTM STP 593,
American Society for Testing and Materials
,
1975
, pp. 117-142.
10.
Whitney
,
J. M.
and
Nuismer
,
R. J.
,
Journal of Composite Materials
 0021-9983, Vol.
8
,
1974
, pp. 253-265.
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