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ASTM Selected Technical Papers
Metal Matrix Composites: Testing, Analysis, and Failure Modes
By
WS Johnson
WS Johnson
1
NASA Langley Research Center
,
Hampton, VA
;
symposium chairman and editor
.
Search for other works by this author on:
ISBN-10:
0-8031-1270-X
ISBN:
978-0-8031-1270-4
No. of Pages:
295
Publisher:
ASTM International
Publication date:
1989

Damage initiation and accumulation has been monitored through acoustic emission (AE) in several center-notched unidirectional metal matrix composites (MMC) and multidirectional boron/aluminum (B/A1) laminates subjected to uniaxial quasi-static tensile loading. Emphasis has been placed on establishing the correlation between the actual damage initiation and growth and AE results. The correspondence between failure processes in the different material systems and the event intensities was investigated, and the results on the event amplitudes are reported. Effect of heat treatment on the failure process and on the associated emission in unidirectional and quasi-isotropic B/Al laminates has also been studied. Notch-tip damage growth was monitored in real-time through optical observations, and effective notch-tip damage extension was determined by applying the compliance matching procedure. Fracture surface morphology was examined via the scanning electron microscope. It is shown that the failure processes in the different material systems can be correlated with the AE event amplitudes. The results indicate that an excellent correlation can be established between the rate of damage growth and the AE results. Thus, it is concluded that AE technique can monitor damage formation and accumulation in MMC in real-time.

1.
Proceedings of the First International Symposium on Acoustic Emission From Reinforced Composites
.
The Society of the Plastics Industry, Inc.
,
San Francisco, CA
, 19–21 July, 1983.
2.
Proceedings of the Second International Symposium on Acoustic Emission From Reinforced Composites
,
The Society of the Plastics Industry, Inc.
,
Montreal, Canada
, 21–25 July, 1986.
3.
Awerbuch
,
J.
and
Ghaffari
,
S.
, “
Monitoring Progression of Matrix Splitting During Fatigue Loading Through Acoustic Emission in Notched Graphite/Epoxy Composite
,”
Journal of Reinforced Plastics and Composites
,
05
1988
, pp. 245–264.
4.
Eckles
,
E. F.
and
Awerbuch
,
J.
, “
Monitoring Acoustic Emission in Cross-Ply Graphite/Epoxy Laminates During Fatigue Loading
,”
Journal of Reinforced Plastics and Composites
,
05
1988
, pp. 265–283.
5.
Awerbuch
,
J.
and
Ghaffari
,
S.
, “
Tracking Progression of Matrix Splitting During Static Loading Through Acoustic Emission in Notched Unidirectional Graphite/Epoxy Composites
,”
Progress in Acoustic Emission III
,
The Japanese Society of NDI
,
1986
, pp. 575–585.
6.
Awerbuch
,
J.
and
Ghaffari
,
S.
, “
Effect of Friction Emission on Monitoring Damage in Composite Laminates Through Acoustic Emission
,”
Progress in Acoustic Emission III
,
The Japanese Society of NDI
,
1986
, pp. 638–652.
7.
Madhukar
,
M. S.
, and
Awerbuch
,
J.
, “
Monitoring Damage Progression in Center Notched Boron/ Aluminum Laminates Through Acoustic Emission
,”
Composite Materials: Testing and Design (Seventh Conference)
, STP 893,
Whitney
J. M.
, Ed.,
American Society for Testing and Materials
,
Philadelphia
,
1986
, pp. 337–367.
8.
Johnson
,
W. S.
,
Bigelow
,
C. A.
, and
Bahei-El-Din
,
Y. A.
, “
Experimental and Analytical Investigation of the Fracture Processes of Boron/Aluminum Laminates Containing Notches
,” NASA Technical Paper 2187,
1983
.
9.
Awerbuch
,
J.
and
Hahn
,
H. T.
, “
K-Calibration of Unidirectional Metal-Matrix Composites
,”
Journal of Composite Materials
,
07
1978
, pp. 222–237.
10.
Bakuckas
,
J. G.
and
Awerbuch
,
J.
, “
Crack-Tip Damage Progression and Acoustic Emission in Unidirectional Silicon Carbide/Titanium 6Al-4V Composites
,”
Proceedings of the Thirteenth International Symposium for Testing and Failure Analysis
, ISTFA/87,
Los Angeles, CA
, 9–13 Nov. 1987, pp. 33–42.
11.
Awerbuch
,
J.
, “
On the Identification of Failure Mechanisms in Composite Laminates Through Acoustic Emission
,”
Acoustic Emission, Deutsche Gesellschaft fur Metallkunde E.V. (DGM)
,
Informationgesellschaft
,
1988
, pp. 47–58.
12.
Madhukar
,
M. S.
, “
Fracture Behavior of Boron/Aluminum Laminates at Room and Elevated Temperatures
,” Ph.D. thesis,
Drexel University
, Philadelphia, PA,
10
1985
.
13.
Awerbuch
,
J.
,
Madhukar
,
M. S.
, and
Bakuckas
,
J. G.
, “
Fracture Toughness Characterization of Filamentary Metal-Matrix Composites Materials Systems: Experimental Study
,” Technical Report, MEM CML-8801,
Drexel University
, Philadelphia, PA,
02
1988
.
14.
Fareed
,
A. S.
,
Koczak
,
M. J.
, and
Awerbuch
,
J.
, “
Microstructural and Fractographic Analysis of SiC/Ti-6Al-4V Filamentary Composites
,” Technical Report, MEMCML-8706,
Drexel University
, Philadelphia, PA,
07
1987
.
15.
Bakuckas
,
J. G.
,
Lau
,
C. W.
, and
Awerbuch
,
J.
, “
Damage Analysis of Notched Unidirectional Metal Matrix Composites
,”
Proceedings of the Thirteenth International Symposium for Testing andFailure Analysis. ISTFA/87
,
Los Angeles, CA
, 9–13 Nov. 1987, pp. 43–53.
16.
Fukuzawa
,
Y.
,
Nakamura
,
T.
,
Ozaki
,
K.
, and
Furuya
,
T.
, “
The Behavior of AE Second Peak on the 2024 Aluminum Alloy
,”
Progress in Acoustic Emission II
,
The Japanese Society of NDI
,
1984
, pp. 1–7.
17.
Roman
,
I.
,
Ono
,
K.
, and
Johnson
,
C. H.
, “
Acoustic Emission Behavior of an Advanced Aluminum Alloy
,”
Proceedings of the Second International Conference on Acoustic Emission
,
Lake Tahoe, NV
, 28 Oct.–1 Nov. 1985, pp. 111–115.
18.
Goree
,
J. G.
and
Jones
,
W. F.
, “
Fracture Behavior of Unidirectional Boron/Aluminum Composite Laminates
,” NASA CR-3753,
1983
.
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