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ASTM Selected Technical Papers
Composite Materials: Testing and Design: Twelfth Volume
By
RB Deo
RB Deo
1
Northrop Corporation
,
Hawthorne, CA 90250
;
symposium cochairman and coeditor
.
Search for other works by this author on:
CR Saff
CR Saff
2
McDouglas Douglas Corporation
,
St. Louis, MO 63165
;
symposium cochairman and coeditor
.
Search for other works by this author on:
ISBN-10:
0-8031-2404-X
ISBN:
978-0-8031-2404-2
No. of Pages:
429
Publisher:
ASTM International
Publication date:
1996

A shear deformation theory is used to analyze the edge crack torsion (ECT) specimen for Mode III interlaminar fracture testing. The theory is based on an assumed displacement field and the principle of virtue work. Mode II interference due to bending-twist coupling in general symmetric laminates is identified. The effects of free-edge delamination on the torsional stiffness and total strain energy release rate of a family of symmetric laminates containing 0, 90, and ±45 layers are studied. Favorable layups for the Mode III interlaminar fracture toughness characterization are recommended. Effective procedures for the determination of minimum torsional stiffness to initiate Mode III delaminations are established.

1.
O'Brien
,
T. K.
and
Martin
,
R. H.
, “
Round Robin Testing for Mode I Interlaminar Fracture Toughness of Composite Materials
,”
Composite Technology & Research
, Vol.
15
, No.
4
, Winter
1993
, pp. 269–281.
2.
Lee
,
S. M.
, “
An Edge Crack Torsion Method for Mode III Delamination Fracture Testing
,”
Composite Technology & Research
, Vol.
15
, No.
3
, Fall
1993
, pp. 193–201.
3.
Li
,
J.
and
Wang
,
Y.
, “
Analysis of a Symmetric Laminate with Mid-Plane Free Edge Delamination Under Torsion: Theory and Application to the Edge Crack Torsion (ECT) Specimen for Mode III Toughness Characterization
,”
Engineering Fracture Mechanics
, Vol.
49
, No.
2
,
1994
, pp. 179–194.
4.
Li
,
J.
and
O'Brien
,
T. K.
, “
Simplified Data Reduction Methods for the ECT Test for Mode III Interlaminar Fracture Toughness
,”
Journal of Composites Technology and Research
, Vol.
18
, No.
1
,
04
1996
, pp. 96–101.
5.
Lekhnitskii
,
S. G.
,
Theory of Elasticity of an Anisotropic Body
,
Holden-Day, Inc.
,
San Francisco
,
1963
, pp. 103–108.
6.
Vinson
,
J. R.
and
Sierakowski
,
R. L.
,
The Behavior of Structures Composed of Composite Materials
,
Martinus Nijhoff Publishers
,
Dordrecht, The Netherlands
,
1986
, pp. 46–47.
7.
Li
,
J.
and
Armanios
,
E. A.
, “
Analysis of Unidirectional and Cross-Ply Laminates Under Torsion Loading
,”
Fracture Mechanics: Twenty-Second Symposium (Volume II)
, ASTM STP 1131,
Atluri
S. N.
,
Newman
,
J. C.
 Jr.
,
Raju
I. S.
, and
Epstein
J. S.
, Eds.,
American Society for Testing and Materials
,
Philadelphia
,
1992
, pp. 421–435.
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