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Structural optimization and experimental analysis of composite material panels for naval use. (English) Zbl 1275.74022
Summary: The purpose of the work is the realization of a composite material with long glass fibers having better characteristic than a fiber random composite, to permit the reduction of weight and costs to shipyards for pleasure craft. Structural optimization is performed by ANSYS for the choice of the layers disposition to obtain the maximum stiffness with minimum material employment, saving weight. The study is centered on the research of the better configurations of ply packing in relation of pure shear stress for four different plies. Unidirectional plies, both symmetric orthotropic and symmetric non-orthotropic ones, are realized successively by the vacuum bag technique. Experimental tests of traction, bending, inter-laminar shear and pure shear are executed to characterize three different types of material. Experimental results are compared to those obtained numerically to validate the procedures; the comparison with analytical results permits to attribute an adequate value to shape factor of the fibers. In all the cases, the optimization allows to construct much more resistant plies than random ones, with a lower thickness.

MSC:
74P05 Compliance or weight optimization in solid mechanics
74E30 Composite and mixture properties
74E35 Random structure in solid mechanics
74-05 Experimental work for problems pertaining to mechanics of deformable solids
Software:
ANSYS
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References:
[1] Lombardo D, Marannano G, Virzì Mariotti G Cirello A. (2004) Characterisation of fibre glass panels for naval use. In: ICEM12, 12th international conference on experimental mechanics, Politecnico di Bari, Italy, 29 August–2 September 2004
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[3] UNI EN 2562 (1998) Prova di flessione parallela alla direzione delle fibre. Unavia
[4] UNI EN 2563 (1997) Determinazione della resistenza apparente al taglio interlaminare. Unavia
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