Abstract

An unbalanced and asymmetric sandwich composite structure consisting of Titanium 6-4 and glass-reinforced plastic (GRP) skins with a phenolic honeycomb core is being considered for construction of a surface ship mast which will enclose critical shipboard equipment. Stability of the structure is one of the major concerns in the design process. This research focuses on analytical and experimental studies of an unbalanced composite sandwich beam subjected to a compressive axial load. The failure load (i.e., peak load) and failure mode of each skin material and the sandwich construction were measured at the laboratory. An analytical model was developed for predicting the failure load of the unbalanced and asymmetric sandwich composite configuration, including the transverse shear energy of the core material. The experimental data agreed very well with analytical prediction. Postbuckling failure, as well as residual strength after initial failure, were also studied.

Issue Section:
Research Papers
Topics:
Buckling, Titanium, Failure, Composite materials, Stress, Construction, Design, Failure mechanisms, Glass reinforced plastics, Honeycomb structures, Peak load, Sandwich construction, Shear (Mechanics), Ships, Skin, Structural stability
1.
Kim
R. Y.
, and
Crasto
A. S.
,
1992
, “
A Longitudinal Compression Test for Composites Using a Sandwich Specimen
,”
Journal of Composite Materials
, Vol.
26
, No.
13
, pp.
1915
–
1929
.
2.
Pearce, T. R. A., and Webber, J. P. H., 1972, “Buckling of Sandwich Panels With Laminated Face Plates,” Aeronautical Quarterly, May, pp. 148–160.
3.
Pearce, T. R. A., and Webber, J. P. H., 1973, “Experimental Buckling Loads of Sandwich Panels With Carbon Fibre Faceplates,” Aeronautical Quarterly, Nov., pp. 295–312.
4.
Somers
M.
,
Weller
T.
, and
Abramovich
H.
,
1992
, “
Buckling and Postbuckling Behavior of Delaminated Sandwich Beams
,”
Composite Structures
, Vol.
21
, pp.
211
–
232
.
5.
Suarez, J. A., Whiteside, J. B., and Hadcock, R. N., 1972, “The Influence of Local Failure Modes on the Compressive Strength of Boron/Epoxy Composites,” Composite Materials: Testing and Design, (Second Conference), ASTM STP 497, American Society for Testing and Materials, pp. 237–256.
6.
Timoshenko, S. P., and Gere, J. M., 1961, Theory of Elastic Stability, McGraw-Hill, New York, NY.
7.
Vinson
J. R.
,
1986
, “
Optimum Design of Composite Honeycomb Sandwich Panels Subjected to Uniaxial Compression
,”
AIAA Journal
, Vol.
24
, No.
10
, Oct., pp.
1690
–
1696
.
8.
Vinson, J. R., 1989, “Comparison of Optimized Sandwich Panels of Various Constructions Subjected to In-Plane Loads,” Proceedings of the First International Conference on Sandwich Constructions, Stockholm, Sweden, June, pp. 23–49.
9.
Vinson, J. R., and Sierakowski, R. L., 1986, The Behavior of Structures Composed of Composite Materials, Martinus Nijhoff Publishers, Dordrecht.
10.
Wang, C.-T., 1953, Applied Elasticity, McGraw-Hill, New York, NY.
11.
Webber, J. P. H., Kyriakides, S., and Lee, C. T., 1976, “On the Wrinkling of Honeycomb Sandwich Columns With Laminated Cross-ply Faces,” Aeronautical Quarterly, June, pp. 264–272.
12.
Whitney, J. M., 1987, Structural Analysis of Laminated Anisotropic Plates, Technomic Pub. Co., Inc., Lancaster, PA.
13.
Yeh
W.-N.
, and
Wu
Y. E.
,
1991
, “
Enhancement of Buckling Characteristics for Sandwich Structure With Fiber Reinforced Composite Skins and Core Made of Aluminum Honeycomb and Polyurethane Foam
,”
Theoretical and Applied Fracture Mechanics
, Vol.
15
, pp.
63
–
74
.
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