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Abstract

Edgewise compression (buckling) tests were performed on unstitched and stitched sandwich specimens made of glass/epoxy face-sheets and polyurethane foam core. The buckling characteristics of the specimens with through-the-thickness stitches and the influence of strain rate on buckling were investigated. Ultimate load carrying capacity of the specimens was determined. Modes and causes of failure along with their relation to the buckling properties were identified. The effect of stitch row spacing on the instability preceding the crush failure was investigated using finite element analyses, which were found to explain the fracture and debonding phenomena accurately. The average sustained critical compression load increased with reduced stitch row spacing and the total buckling load decreased with decrease in strain rate, as revealed by the buckling experimental studies.

Keywords

buckling debonding stitches damage FEA

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References

1. Torre, L. , Kenny, J.M. and Mamalis, A.G. (1997). Energy Adsorbing Behaviour of Composites Sandwich Panels for Civil Transportation , In: Proceedings of the 20th Jubilee International SAMPE Europe Conference, p. 457 , 1997 April 13-15, Paris.

2. Hwu, C. and Hu, J.S. (1992). Buckling and Postbuckling of Delaminated Composites Sandwich Beams , AIAA Journal, 30(7): 1901-1909 .

3. Kim, W.C. and Dharan, C.K.H. (1992). Facesheet Debonding Criteria for Composite Sandwich Panels under In-Plane Compression , Engineering Fracture Mechanics, 42(4): 642-652 .

4. Thomson, R.S. , Shah Khan, M.Z. and Mouritz, A.P. (1998). Shear Properties of a Sandwich Composites Containing Defects , Composite Structures, 42: 107-118 .

5. Farley, G.L. (1987). Crash Energy Absorbing Sub-floor Beam Structures , Journal of the American Helicopter Society, 32(4): 28-32 .

6. Raju, K.S. and Tomblin, J.S. (1999). Energy Absorption Characteristics of Stitched Composite Sandwich Panels , Journal of Composites Materials, 33(8): 712-728 .

7. Chen, H.P. (1993). Transverse Shear Effects on Buckling and Post Buckling of Laminated and Delaminated Plats , AIAA Journal, 31(1): 163-169 .

8. Rao, K.M. (1985). Buckling Analysis of Anisotropic Sandwich Plates Faced with Fiber-reinforced Plastics , AIAA J, 23(8): 1247-1253 .

9. Yin, W.L. , Sallam, S.N. and Simitses, G.J. (1998). Ultimate Axial Load Capacity of a Delaminated Beam-Plate , AIAA Journal, 24(1): 123-128 .

10.

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

11.

11. L. John , III Avery and and Sankar, Bhavani V. (2000). Compressive Failure of Sandwich Beams with Debonded Face-sheets , Journal of Composites Materials, 34(14): 1176-1199 .

12.

12. Konishi, D.Y. (1983). Delamination Growth in Composite Structures under Inplane Compressive Loading, AGARD-CP-355, April 12-14, pp. 22-31, London, UK .

13.

13. Gillespie, J.W. and Carlsson, L.A. (1991). Buckling and Growth of Delamination in Thermoset and Thermoplastic Composites , Journal of Engineering Materials and Technology, 113: 93-98 .

14.

14. Gillespie, J.W. and Pipes, R.B. (1984). Compressive Strength of Composite Laminates with Interlaminar Defects , Composites Structures, 2: 49-69 .

15.

15. Kassapoglou, C. , Fantle, S.C. and Chou, J.C. (1995). Wrinkling of Composites Sandwich Structures under Compression , Journal of Composites Technology and Research, JCTRER, 17(4): 308-316 .

16.

16. Bao, G. , Jiang, W. and Roberts, J.C. (1997). Analytic and Finite Element Solutions for Bending and Buckling of Orthotropic Rectangular Plates , Int. Journal Solids Struct., 34(14): 1797-1821 .

Buckling Response of Stitched Polyurethane Foam Composite Sandwich Structures

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