Sociedad Española de Integridad Estructural
Grupo Español de Fractura

Sociedad Española de Integridad Estructural
Grupo Español de Fractura

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MECHANICAL BEHAVIOUR OF SANDWICH COMPOSITES WITH DIFFERENT CHARGED FOAM LAYERS

C. Capela  J.A.M. Ferreira  F.V. Antunes  J.D. Costa     

Anales de la Mecánica de la Fractura, nº 27 . 2010 . Pág. -
Ver (.pdf): 21

Resumen: Hollow glass microspheres are widely used as core material in sandwich construction, particularly in sea water structures, in consequence of their beneficial properties namely: no corrosion effects, design freedom and low density. Microspheres are commercially provided in many different densities, strength and diameter sizes. In the present study a batch of hollow microspheres Verre ScotchitTM-K20 manufactured by 3M was selected along with epoxy 520 resin and hardener 523 to produce the core foams. Two skins were used: net epoxy resin and carbon laminate composite with 2mm thickness, manufactured using twelve woven, balanced, bi-directional, layers of carbon fibres and epoxy resin matrix. Panels sandwich were manufactured using homogeneous and multilayer core foams with the purpose of improving specific flexural stiffness modulus. It was concluded that the panels with carbon reinforced skins exhibit much higher values of strength and stiffness than non-reinforced, multilayered panels with different loads of microspheres (higher percentage of microsphere in the center and lower in the outer) have also higher resistance and stiffness than the panels with homogeneous microsphere percentage core. A tendency to the increase of both properties was observed when the displacement rate increases from 0.5 mm/min to 10 mm/min for all architectures.

LocalizaciónPorto

CDRsp, Centre for Rapid and Sustainable Product Development, Polytechnic Institute of Leiria, Morro do Lena - Alto Vieiro, 2400-901 Leiria, Portugal.
CEMUC, Mechanical Engineering Department, University of Coimbra, Rua Luís Reis Santos, Pinhal de Marrocos, 3030-788, Coimbra, Portugal.
CEMUC, Mechanical Engineering Department, University of Coimbra, Rua Luís Reis Santos, Pinhal de Marrocos, 3030-788, Coimbra, Portugal.
CEMUC, Mechanical Engineering Department, University of Coimbra, Rua Luís Reis Santos, Pinhal de Marrocos, 3030-788, Coimbra, Portugal.



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