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ASTM Selected Technical Papers
Cracks and Fracture
By
JL Swedlow
JL Swedlow
1
Carnegie-Mellon University
,
Pittsburgh, Pa. 15213
;
symposium co-chairman
.
Search for other works by this author on:
ML Williams
ML Williams
2
University of Pittsburgh
,
Pittsburgh, Pa. 15261
:
symposium co-chairman
.
Search for other works by this author on:
ISBN-10:
0-8031-0318-2
ISBN:
978-0-8031-0318-4
No. of Pages:
593
Publisher:
ASTM International
Publication date:
1976

The fracture toughness and flexural strength of ATJ-S polycrystalline graphite and two chemical-vapor-deposited (CVD) carbon-carbon composites (CVD/felt and CVD/filament wound) are reported for temperatures between 20 and 2000°C. For both the ATJ-S and CVD/felt materials, the toughness and strength are found to rise linearly with increasing temperature. The properties of CVD/filament wound composite exhibit the greatest directional dependence of the materials examined. When the machined notch is oriented perpendicular to the reinforcing filaments, the CVD/filament wound specimens fail by delamination, precluding any fracture toughness determination.

Results of scanning and transmission electron microscopy of the fracture surfaces are also presented. In the case of the polycrystalline graphite, a preference for interfacial separation and, to a lesser extent, cleavage separation are observed.

1.
Stoller
,
H. M.
 et al
, “
Properties of Flight-Tested CVD/Felt, and CVD/FW Carbon Composites
,” Report SC-DC-71-4046,
Sandia Laboratories
, Albuquerque, N. Mex.
06
1971
.
2.
McAllister
,
L. E.
and
Taverna
,
A. R.
Development and Evaluation of Mod 3 Carbon/Carbon Composites
,”
Material Review for 1972
, Vol.
17
,
National SAM-PLE Symposium
,
Los Angeles, Calif.
,
04
1972
, p. III-A-Three-1-7.
3.
Grose
,
J. G.
, “
Structural Assessment of Carbon-Carbon Materials for the Carbon-Carbon Assessment Program
,” Report 1011-00-01,
Prototype Development Association
, Costa Mesa, Calif.,
01
1974
.
4.
Corum
,
J. M.
,
Journal of Nuclear Materials
 0022-3115, Vol.
22
,
1967
, pp. 41-54.
5.
Davidge
,
R. W.
and
Tappin
,
G.
,
Journal of Material Science
, Vol.
3
,
1968
, pp. 165-173.
6.
Stevens
,
R.
,
Carbon
 0008-6223, Vol.
9
,
1971
, pp. 573-578
7.
Vitovec
,
F. H.
,
Journal of Testing and Evaluation
 0090-3973, Vol.
1
, No.
3
,
05
1973
, pp. 250-254.
8.
Guess
,
T. R.
and
Hoover
,
W. R.
,
Journal of Composite Materials
 0021-9983, Vol.
7
,
1973
, pp. 2-20.
9.
Hoover
,
W. R.
and
Guess
,
T. R.
,
Journal of Composite Materials
 0021-9983, Vol.
7
,
1973
, pp. 334-345.
10.
Irwin
,
J. L.
, “
Development and Evaluation of Carbon-Carbon Reentry Heat Shields
,” SC-DR-70-108,
Sandia Laboratories
,
Albuquerque, N. Mex.
,
04
1972
.
11.
Frye
,
E. R.
and
Rayner
,
R. M.
,
Journal of Composite Materials
 0021-9983, Vol.
6
,
04
1972
, pp. 286-292.
12.
Mason
,
I. B.
and
Knibbs
,
R. H.
,
Carbon
 0008-6223, Vol.
5
,
1967
, pp. 493-506.
13.
Starrett
,
H. S.
and
Pears
,
C. D.
, “
Probable and Average Properties of ATJ-S (WS) Graphite
,” Technical Report AFML-TR-73-14,
Air Force Materials Laboratory
, Daton, Ohio, Vol.
1
,
1973
.
14.
Mrozowski
,
S.
, in
Proceedings
,
First and Second Conferences on Carbon
,
The Waverly Press
,
02
1956
, pp. 31-45.
15.
Roberts
,
F.
,
Mason
,
I. B.
,
Price
,
M. S.
, and
Bromley
,
J.
,
Progress in Nuclear Technology
, Vol.
4
, Series 4,
1961
, p. 105.
16.
Martens
,
V. E.
, et al
in
Proceedings
,
4th Conference on Carbon
,
Pergamom Press
,
1960
, pp. 511-529.
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