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ASTM Selected Technical Papers
Composite Materials: Testing and Design (Ninth Volume)
By
SP Garbo
SP Garbo
1Sikorsky Aircraft Division,
United Technologies Corp.
,
Stratford, CT 06601
;
symposium chairman and editor
.
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ISBN-10:
0-8031-1287-4
ISBN:
978-0-8031-1287-2
No. of Pages:
598
Publisher:
ASTM International
Publication date:
1990

Local buckling of a delaminated group of plies can lead to high interlaminar stresses and delamination growth. The mechanics of instability-related delamination growth (IRDG) had been described previously for the through-width delamination. This paper uses the results of finite-element analyses to gain insight into the mechanics of IRDG for the embedded delamination subjected to either uniaxial or axisymmetric loads. This insight is used to explain the dramatic differences in strain energy release rates observed for the through-width delamination, the axisymmetrically loaded embedded delamination, and the uniaxially loaded embedded delamination.

1.
Konishi
,
D. Y.
and
Johnson
,
W. R.
, “
Fatigue Effects on Delaminations and Strength Degradation in Graphite/Epoxy Laminates
,”
Composite Materials: Testing and Design, Fifth Conference
, ASTM STP 674,
American Society for Testing and Materials
,
Philadelphia
,
1979
, pp. 597–619.
2.
Whitcomb
,
J. D.
, “
Finite-Element Analysis of Instability Related Delamination Growth
,”
Journal of Composite Materials
, Vol.
15
,
09
1981
, pp. 403–426.
3.
Shivakumar
,
K. N.
and
Whitcomb
,
J. D.
, “
Buckling of a Sublaminate in a Quasi-Isotropic Composite Laminate
,”
Journal of Composite Materials
, Vol.
19
,
01
1985
.
4.
Whitcomb
,
J. D.
, “
Parametric Analytical Study of Instability-Related Delamination Growth
,”
Composites Science and Technology
 0266-3538, Vol.
25
,
1986
, pp. 19–48.
5.
Chai
,
H.
,
Babcock
,
C. D.
, and
Knauss
,
W. G.
, “
One-Dimensional Modelling of Failure in Laminated Plates by Delamination Buckling
,”
International Journal of Solids Structures
 0020-7683, Vol.
17
, No.
11
,
1981
, pp. 1069–1083.
6.
Chai
,
H.
and
Babcock
,
C. D.
, “
Two-Dimensional Modelling of Compressive Failure in Delaminated Laminates
,”
Journal of Composite Materials
, Vol.
19
,
01
1985
, pp. 67–98.
7.
Whitcomb
,
J. D.
and
Shivakumar
,
K. N.
, “
Strain-Energy Release Rate Analysis of a Laminate with a Postbuckled Delamination
,” Fourth International Conference on Numerical Methods in Fracture Mechanics,
Pineridge Press
,
1987
, pp. 581–605:
also available on NASA TM 89091.
National Aeronautics and Space Administration
, Washington, D.C.
8.
Whitcomb
,
J. D.
, “
Three-Dimensional Analysis of a Postbuckled Embedded Delamination
,” NASA TP 2823,
National Aeronautics and Space Administration
,
Washington, D.C.
,
1988
.
9.
Bottega
,
W. J.
, “
The Mechanics of Delamination in Composite Materials
,” Ph D. thesis,
Yale University
, New Haven, CT,
05
1984
.
10.
Frederick
,
D.
and
Chang
,
T. S.
,
Continuum Mechanics
,
Scientific Publishers, Inc.
,
Cambridge
,
1972
, pp. 79–82.
11.
Zienkiewicz
,
O. C.
, “
Incremental Displacement in Non-linear Analysis
,”
International Journal for Numerical Methods in Engineering
 0029-5981, Vol.
3
,
1971
, pp. 587–592.
12.
Wang
,
S. S.
and
Choi
,
I.
, “
The Mechanics of Delamination in Fibre-Reinforced Composite Laminates: Part I-Stress Singularities and Solution Structure; Part II-Delamination Behavior and Fracture Mechanics Parameters
,” NASA CR 172269 and 172270,
National Aeronautics and Space Administration
, Washington, D.C.,
11
1983
.
13.
Rybicki
,
E. F.
and
Kanninen
,
M. F.
, “
A Finite-Element Calculation of Stress Intensity Factors by a Modified Crack Closure Integral
,”
Engineering Fracture Mechanics
 0013-7944, Vol.
9
,
1977
, pp. 931–938.
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