Paper number 418
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INFLUENCE OF SOME STRUCTURAL PARAMETERS ON BOTH THEORETICAL AND EXPERIMENTAL COMPRESSIVE STRENGTH OF LAMINATES |
S. Drapier1, L. Daridon2, and J.-C. Grandidier3
1Mechanical and Materials Eng. Dept., Ecole Nat. Sup. des Mines de Saint-Étienne
158 Cours Fauriel, 42023 Saint-Étienne cedex02, France
2Laboratory for the Mechanics of Industrial Multi-Material
Université Louis Pasteur, rue du maréchal Lefèbvre, 67100 Strasbourg, France
3Laboratory of Mechanical Modelling and Applied Mathematics
SP2MI, Boulevard 3, Téléport 2, BP179, 86960 Futuroscope cedex, France
| Summary | It is now well established that the axial compressive strength of long-fibre composites is limited by the development of a local mechanism called microbuckling which depends strongly on the coupling of fibre initial geometric imperfection with the resin non-linear shear behaviour. Besides this local phenomenon, failure strains measured experimentally depend also on some structural parameters at the ply scale, effect of which is less well known. We have been investigating for several years the effect of these structural parameters, called structure effect, from both an experimental and a theoretical point of view. A model that is able to account for both local and structural parameters, with reasonable computation amounts, was proposed recently. Meanwhile, thanks to a thoroughfull examination of some existing experimental devices, new designs were proposed for both compression and bending-compression tests. Here, by cross-checking the results of these complementary studies is demonstrated the necessity of accounting for the structure effect to design composite structures against compression. |
Keywords | compressive strength, plastic microbuckling, structure effect, mesoscopic modelling, geometric imperfection, experimental device. |