Three-dimensional Finite Element Buckling Analysis of Debonded Sandwich Panels

Abstract

A three-dimensional (3D) finite element analysis has been conducted to examine the local buckling behavior of foam-cored composite sandwich panels containing a face-core debond. The influences of core stiffness and debond size and shape are examined. The core stiffness was found to have a profound influence on the local buckling load, especially for low modulus cores and smaller debonds. Panels with square debonds buckled at lower loads than those with circular debonds of the same dimension, and buckling loads for both circular and square debonds decreased with increased debond size. The results of the analysis were compared to local buckling loads determined experimentally. Reasonable agreement was found between the predicted and experimentally measured local buckling loads for both circular and square debonds.

Keywords

sandwich panels FE buckling debond local instability

Get full access to this article

View all access options for this article.

References

Zenkert, D. (1997). An Introduction to Sandwich Construction, EMAS, London .

Vinson, J. R. (1999). The Behavior of Sandwich Structures of Isotropic and Composite Materials, Technomic, Lancaster .

Allen, H. G. (1969). Analysis and Design of Structural Sandwich Panels, Pergamon Press, Oxford .

Guedra-Degeorges, D. , Thevenet, P. and Maison, S. (1997). Damage Tolerance of Aeronautical Sandwich Structures , In: Proceedings of the EUROMECH 360 Colloquium, Saint Etienne, May 13-15, pp. 29-36 .

Vadakke, V. and Carlsson, L. A. (2004). Experimental Investigation of Compression Failure of Sandwich Specimens with Face/Core Debond , Composites, Part B, 35(6-8): 583-590 .

Hoyns, D. E. and Loup, D. C. (2003). In-Plane Compression Response of Impact-Damaged Sandwich Panels , In: Proceedings of the Sixth International Conference on Sandwich Structures (ICSS-6), Fort Lauderdale, Florida, March 31-April 2, CRC Press, Boca Raton, pp. 181-189 .

Shipsha, A. , Hallstrom, S. and Zenkert, D. (2003). Failure Mechanisms and Modeling of Impact Damage in Sandwich Beams - A 2D Approach: Part II - Analysis and Modeling , Journal of Sandwich Structures and Materials, 5(1): 33-52 .

Chai, H. , Babcock, C. D. and Knauss, W. G. (1981). One Dimensional Modeling of Failure in Laminated Plates by Delamination Buckling , Int. J. Solids & Struct., 17(11): 1069-1083 .

Chai, H. and Babcock, C. D. (1985). Two Dimensional Modeling of Compressive Failure in Delaminated Laminates , J. Compos. Mater., 19(Jan): 67-98 .

10.

Flanagan, G. F. (1988). Two-Dimensional Delamination Growth in Composite Laminates Under Compression Loading, ASTM STP 972, pp. 180-192.

11.

Vizzini, A. J. and Lagace, P. A. (1987). The Buckling of a Delaminated Sublaminate on an Elastic Foundation , J. Compos. Mater., 21: 1106-1117 .

12.

Nilsson, K. F. , Thesken, J. C. , Sindelar, P. , Giannakopoulos, A. E. and Storakers, B. (1983). A Theoretical and Experimental Investigation of Buckling Induced Delamination Growth , J. Mech. Phys. Solids, 41(4): 749-782 .

13.

Whitcomb, J. D. (1981). Finite Element Analysis of Instability Related Delamination Growth , J. Compos. Mater., 15: 403-426 .

14.

Sleight, D. W. and Wang, J. T. (1995). Buckling Analysis of Debonded Sandwich Panel Under Compression, NASA Technical Memorandum 4701, December.

15.

Niu, K. and Talreja, R. (1999). Buckling of a Thin Face Layer on Winkler Foundation with Debonds , Journal of Sandwich Structures and Materials, 1(4): 259-277 .

16.

Aviles, F. and Carlsson, L. A. (2005). Elastic Foundation Analysis of Local Face Buckling in Debonded Sandwich Columns , Mechanics of Materials, 37(10): 1026-1034 .

17.

Veedu, V. P. and Carlsson, L. A. (2005). Finite Element Buckling Analysis of Sandwich Columns Containing a Face/Core Debond , Composite Structures, 69(2): 143-148 .

18.

Berggreen, C. (2004). Damage Tolerance of Debonded Sandwich Structures, PhD Thesis, Technical University of Denmark, Copenhagen.

19.

Kassapoglou, C. , Jonas, P. J. and Abbott, R. (1988). Compressive Strength of Composite Sandwich Panels After Impact Damage: An Experimental and Analytical Study, Journal of Composite Technology and Research, 10(2): 65-73 .

20.

Shipsha, A. (2003). Edgewise Compression of Sandwich Panels with Impact Damage , In: Proceedings of the Sixth International Conference on Sandwich Structures (ICSS-6), Fort Lauderdale, Florida, March 31-April 2, CRC Press, Boca Raton, pp. 154-162 .

21.

ANSYS 6.1 Users Manual (2004). Swanson Analysis Systems, Houston, PA .

22.

Cook, R. D. (1995). Finite Element Modeling for Stress Analysis, John Wiley & Sons, NY .

23.

Aviles, F. and Carlsson, L. A. (2006). Experimental Study of Debonded Sandwich Panels Under Compression Loading , Journal of Sandwich Structures and Materials, 8(1): 7-31 .

24.

Chou, P. C. , Corleone, J. and Hsu, C. M. (1972). Elastic Constants of Layered Media , J. Compos. Mater., 6: 80-93 .

25.

Bogetti, T. A. , Hoppel, C. P. R. , Harik, V. M. , Newill, J. F. and Burns, B. P. (2004). Predicting the Nonlinear Response and Progressive Failure of Composite Laminates , Composites Science and Technology, 64(3-4): 329-342 .

26.

DIAB Divinycell, Technical Specification, Divinycell International, Laholm.