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ASTM Selected Technical Papers
Effects of Defects in Composite Materials
By
DJ Wilkins
DJ Wilkins
1
Engineering staff specialist
,
General Dynamics
,
Fort Worth, Texas
;
symposium chairman
.
Search for other works by this author on:
ISBN-10:
0-8031-0218-6
ISBN:
978-0-8031-0218-7
No. of Pages:
281
Publisher:
ASTM International
Publication date:
1984

The effect of delaminations on the stiffness-controlled behavior of laminated composites is investigated. Four panels of [±45,0,90]2s quasi-isotropic layup are fabricated from the T300/Narmco 5208 material system, three with prescribed delaminations of different rectangular shapes and orientations. Nondestructive buckling tests and vibration experiments are conducted on these panels with clamped-free and clamped-simple support boundary conditions to assess the stiffness-controlled behavior. Free-free vibration tests are also conducted to study the influence of delamiantions on higher modes. Finite-element analyses are performed to compare with the experimental results. The findings indicate that delaminations of the size considered can be tolerated for some service conditions without dire consequences.

1.
Sprigg
,
R. G.
, “
An Experimental Study to Determine the Reduction in Ultimate Bending Moment of a Composite Plate Due to an Internal Delamination
,” M. S. thesis,
Navy Postgraduate School
, Monterey, Calif.,
12
1977
.
2.
Ramkumar
,
R. L.
,
Kulkarni
,
S. V.
, and
Pipes
,
R. B.
in
Proceedings
,
34th Annual Technical Conference
,
The Society of Plastics Industry, Inc.
, Section 22-E,
1979
, pp. 1-5.
3.
Adams
,
R. C.
,
Walton
,
D.
,
Flitcroft
,
J. E.
, and
Short
,
D.
in
Composite Reliability
, ASTM STP 580,
American Society for Testing and Materials
,
1975
, pp. 159-175.
4.
Kulkarni
,
S. V.
and
Frederick
D.
,
Journal of Composite Materials
 0021-9983, Vol.
5
,
01
1971
, pp. 112-119.
5.
Horton
,
W. H.
,
Cundari
,
F. L.
, and
Johnson
,
R. W.
, “
Applicability of Southwell Plot to the Interpretation of Test Data Obtained from Stability Studies of Elastic Column and Plate Structures
,”
USAAVLABS Technical Report
69-32,
U.S. Army Aviation Laboratories
, Fort Eustis, Va.,
11
1971
.
6.
Bathe
,
K. J.
,
Wilson
,
E. L.
, and
Peterson
,
F. E.
, “
Structural Analysis Program for Static and Dynamic Response of Linear Systems
,” Report No. EERC 73-11,
University of California
, Berkeley, Calif.,
06
1973
(revised April 1974).
7.
Whetstone
,
W. D.
, “
EISI-EAL: Engineering Analysis Language
,”
Engineering Information Systems, Inc.
,
Saratoga, Calif.
,
01
1979
.
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