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ASTM Selected Technical Papers
Composite Materials: Fatigue and Fracture (Third Volume)
By
TK O'Brien
TK O'Brien
1
U.S. Army Aerostructures Directorate (AVSCOM), NASA Langley Research Center
,
Hampton, Virginia
;
symposium chairman and editor
.
Search for other works by this author on:
ISBN-10:
0-8031-1419-2
ISBN:
978-0-8031-1419-7
No. of Pages:
838
Publisher:
ASTM International
Publication date:
1991

A study was conducted to analyze tapered composite laminates under tensile loading. A tapered construction made of S2/SP250 glass/epoxy laminate was used to achieve a thickness reduction using three consecutive dropped plies over a distance of 60 ply thicknesses. The principle of minimum complementary potential energy was used to determine interlaminar stresses. The interlaminar peel stress distribution shows a higher tensile intensity at the taper/thin portion juncture. The total strain energy release rate is determined using a simplified membrane model. Results are compared with a finite element simulation.

1.
Kemp
,
B. L.
and
Johnson
,
E. R.
, “
Response and Failure Analysis of a Graphite-Epoxy Laminate Containing Terminating Internal Plies
,”
Proceedings
, Twenty-Sixth AIAA/ASME/ASCE/AHS Structures, Structural Dynamics, and Materials (SDM) Conference, AIAA Paper No. 85-0608,
04
1985
, pp. 13–24.
2.
Curry
,
J. M.
,
Johnson
,
E. R.
, and
Starnes
,
J. H.
, Jr.
, “
Effect of Dropped Plies on the Strength of Graphite-Epoxy Laminates
,”
Proceedings
, Twenty-Ninth AIAA/ASME/ASCE/AHS Structures, Structural Dynamics and Materials (SDM) Conference,
Monterey, CA
, AIAA Paper No. 87-0874, 6–8 April 1987, pp. 737–747.
3.
Wu
,
C. M.
and
Webber
,
P. H.
, “
Analysis of Tapered (in Steps) Laminated Plates Under Uniform Inplane Load
,”
Composite Structures
, Vol
5
,
1986
, pp. 87–100.
4.
Fish
,
J. C.
and
Lee
,
S. W.
, “
Delamination of Tapered Composite Structures
,”
Engineering Fracture Mechanics
, Vol.
34
, No.
1
,
1989
, pp. 43–54.
5.
Salpekar
,
S. A.
,
Raju
,
I. S.
, and
O'Brien
,
T. K.
, “
Strain Energy Release Rate Analysis of Delamination in a Tapered Laminate Subjected to Tension Load
,” Third Technical Conference,
American Society for Composites
,
Seattle, WA
, 26–29 Sept. 1988, pp. 642–654.
6.
Rehfield
,
L. W.
,
Armanios
,
E. A.
, and
Weistein
,
F.
, “
Analytical Modeling of Interlaminar Fracture in Laminated Composites
,” Composites '86: Recent Advances in Japan and the United States,
Proceedings
, Third Japan-U.S. Conference on Composite Materials,
Kawata
K.
,
Umekawa
S.
,
Kobayashi
A.
, Eds.,
Japan Society for Composite Materials
,
Tokyo
,
1986
, pp. 331–340.
7.
Armanios
,
E. A.
and
Rehfield
,
L. W.
, “
Sublaminate Analysis of Interlaminar Fracture in Composites: Part I—Analytical Model
,”
Journal of Composites Technology & Research
 0884-6804, Vol.
11
, No.
4
, Winter
1989
, pp. 135–146.
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