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

Results of an experimental and analytical investigation of the compressive strength of unidirectional boron-epoxy composite material are presented. Observation of fiber coordinates in a boron-epoxy composite indicates that the fibers contain initial curvature. Combined axial compression and torsion tests were conducted on boron-epoxy tubes and it was shown that the shear modulus is a function of axial compressive stress. An analytical model which includes initial curvature in the fibers and permits an estimate of the effect of curvature on compressive strength is proposed. Two modes of failure which may result from the application of axial compressive stress are analyzed—delamination and shear instability. Based on tests and analysis, failure of boron-epoxy under axial compressive load is due to shear instability.

1.
Davis
,
John G.
, Jr.
, “
Compressive Strength of Lamina Reinforced and Fiber Reinforced Composite Materials
,” Ph.D. thesis,
Virginia Polytechnic Institute and State University
, Blacksburg, Va.,
05
1973
.
2.
Rosen
,
B. W.
, “
Mechanics of Composite Strengthening
,”
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,
American Society of Metals
,
Metals Park, Ohio
,
10
1964
.
3.
Swift
,
G. W.
, “
The Solution of N Simultaneous Second Order Coupled Differential Equations by the Finite Difference Method
,” Department of Engineering Mechanics, Virginia Polytechnic Institute Report No. VPI-E-71-3, Contract No. DAA-F07-70-C-0444,
02
1971
.
4.
Foye
,
R. L.
, “
Compressive Strength of Unidirectional Composites
,” AIAA Paper No. 66-143,
American Institute of Aeronautics and Astronautics
,
01
1966
.
5.
Suarez
,
J. A.
,
Whiteside
,
J. B.
, and
Hadcock
,
R. N.
in
Composite Materials: Testing and Design (Second Conference)
, ASTM STP 497,
American Society for Testing and Materials
,
1972
, pp. 237–256.
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