This paper validates and applies a modelling procedure for analysing the non-linear behaviour of structures made of foams or sandwich materials with foam cores, subjected to mechanical loading. Modelling considers the non-linear behaviour of foam cores and permits the investigation of the fracture processes induced in the foam cores, in the skin layers or at the interfaces between the foam cores and the skins. Results deduced from the modelling procedure are compared with the experimental results obtained first in the case of indentation tests performed on foams and sandwich materials with foam cores and next in the case of foam sandwich materials subjected to three-point bending tests.
1. Davies, P., Choqueuse, D. and Pichon, A. (1994). Influence of the foam core on composite sandwich static and impact response. In: Schulte, P.J. and Wittich, H. (eds.), In: Proceedings of European Conference on Composites Testing and Standardisation. Hamburg, Germany, Hamburg. pp. 513-522. 13-15 September.
2.
2. Roach, A.M., Evans, K.E. and Jones, N. (1998). The penetration energy of sandwich panel elements under static and dynamic loading. Part I. Composite Structures, 42: 119-134.
3.
3. Roach, A.M., Jones, N. and Evans, K.E. (1998). The penetration energy of sandwich panel elements under static and dynamic loading. Part II. Composite Structures, 42: 135-152.
4.
4. Found, M.S., Holden, G.J. and Swamy, R.N. (1997). Static indentation and impact behaviour of GRP pultruded sections. Composite Structures, 39(3-4): 223-228.
5.
5. Timoshenko, S.P. and Goodier, J.N. (1970). Theory of Elasticity. New York: Mc Graw Hill.
6.
6. Greszczuk, L.B. (1975). Response of isotropic and composite materials to particle impact. Foreign Object Impact Damage to Composites. ASTM STP 568. pp. 183-211.
7.
7. Sun, C.T. (1977). An analytical method for evaluation of impact damage energy of laminated composites. Composite Materials: Testing and Design (4th conference). ASTM STP 617. pp. 427-440.
8.
8. Yang, S.H. and Sun, C.T. (1982). Indentation law for composite laminates. Composite Materials: Testing and Design (6th conference). ASTM STP 787. pp. 425-449.
9.
9. Weissman-Berman, D., Petrie, G.L. and Wang, M.-M. (1988). Flexural response of Foam-Cored Sandwich Panels. New York: The Society of Naval Architects and Marine Engineers.
10.
10. Meyer-Piening, H.-R. (1989). Remarks on higher order sandwich stress and deflection analysis. In: K.-A. and Reichard, R.P. (eds.), Sandwich Construction 1. In: Proceedings of 1st International Conference on Sandwich Construction. Stockolm, Sweden. Olsson. pp. 107-127. 19-21 June.
11.
11. Thomsen, O.T. (1989). Analysis of local bending effects in sandwich panels subjected to concentrated loads. In: Olsson, K.-A. and Weissman-Berman, D. (eds.), Sandwich Construction 2. In: Proceedings of 2nd International Conference on Sandwich Construction. University of Florida, Gainesville, Florida, USA. pp. 107-127. 9-12 March.
12.
12. Thomsen, O.T. (1992). Photoelatic investigation of local bending effects in sandwich beams. Report N 41. Institute of Mechanical Engineering, Aalborg University, Danemark.
13.
13. Thomsen, O.T. (1993). Analysis of local bending effects in sandwich plates with orthotropic face layers subjected to localized loads. Composite Structures, 25: 511-520.
14.
14. Thomsen, O.T. (1995). Theoretical and experimental investigation of local bending effects in sandwich plates. Composite Structures, 30: 85-101.
15.
15. Thomsen, O.T., Rits, W., Eaton, D.C.G. and Brown, S. (1996). Ply drop-off effects in CFRP/honeycomb sandwich panels - theory. Composites Science and Technology, 56: 407-422.
17. Berthelot, J.-M. (1999). Composite Materials. Mechanical Behaviour and Structural Analysis. New York: Springer.
18.
18. Frostig, Y. and Baruch, M. (1990). Bending of sandwich beams with transversely flexible core. AIAA Journal, 28(11): 523-531.
19.
19. Frostig, Y., Baruch, M., Vilnai, O. and Sheinman, I. (1991). Bending of non-symmetric sandwich beams with transversely flexible core-bending behaviour. Journal of Engineering Mechanics, 117(5): 1931-1952.
20.
20. Frostig, Y. (1992). Behaviour of delaminated sandwich beams with transversely flexible core high order theory. Composite Structures, 20: 1-16.
21.
21. Frostig, Y., Baruch, M., Vilnai, O. and Sheinman, I. (1992). High-order theory for sandwich beams bending with transversely flexible core. Journal of Engineering Mechanics, 118(5): 1026-1043.
22.
22. Frostig, Y. and Baruch, M. (1993). High-order buckling analysis of sandwich beams with transversely flexible core. Journal of Engineering Mechanics, 119(3): 476-495.
23.
23. Frostig, Y. (1993). On stress concentration in the bending of sandwich beams with transversely flexible core. Composite Structures, 24: 161-169.
24.
24. Frostig, Y. (1993). High-order behaviour of sandwich beams with transversely flexible core and transverse diaphragms. Journal of Engineering Mechanics, 119(5): 955-972.
25.
25. Frostig, Y. and Shenhar, I. (1995). High-order bending of sandwich beams with transversely flexible core and unsymmetrical laminated composite skins. Composite Engineering, 5(4): 405-414.
26.
26. Thomsen, O.T. and Fostig, Y. (1997). Localized bending effects in sandwich panels: photoelastic investigation versus high-order sandwich theory results. Composite Structures, 119(3): 476-495.
27.
27. Frostig, Y. and Baruch, M. (1996). Localized load effects in high-order bending of sandwich panels with transversely flexible core. Journal of Engineering Mechanics, 122(11): 1069-1076.
28.
28. Berthelot, J.-M. and Lolive, É.Non-linear behaviour of foam cores and sandwich materials, Part 1: Materials and modelling. Journal of Sandwich Structures and Materials, 4(3): 219-247.
29.
29. Legendre, B. and Lamy, B. (1995). Spécificité du comportement au poinç onnement de matériaux sandwiches. In: Proceedings of 9émes Journées Nationales sur les Composites. pp. 773-783.
30.
30. Lolive, É (2000). Analyse du comportement non linéaire de poutres en materiaux sandwiches avec â me en mousse. PhD thesis, Université du Maine, Le Mans, France. 26 September.
31.
31. Picart, P., Lolive, É and Berthelot, J.-M. (2001). Characterization of composite materials using a polarizing speckle interferometer. Optical Engineering, 40(1): 81-89.
