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3. Tissue plasminogen activator-treated patients with acute ischemic stroke in the pioneer public service of Rio de Janeiro: a comparative profile with the NINDS study

Author

Missaka, H, primary, Almeida, JE, additional, Figueiredo, PC, additional, Nogueira, CL, additional, Julião, VR, additional, Alencar, JLL, additional, Lannes, RS, additional, Fernandes, SL, additional, Caetani, G, additional, Abrantes, J, additional, Bevilacqua, TD, additional, Antonucci, V, additional, Pinto, PHCF, additional, and Divan-Filho, S, additional

Published
2011
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20. Impact Behavior of Polyester GFRP for Naval Applications: Influence of the Clamping Device and Fluid–Material Interaction

Author

Vincenza Antonucci, Antonio Langella, Valentina Lopresto, Ilaria Papa, M.R. Ricciardi, Ricciardi, M. R., Papa, I., Antonucci, V., Lopresto, V., and Langella, A.

Subjects
resin transfer molding, 010302 applied physics, fluid–material interaction, Materials science, Transfer molding, Mechanical Engineering, Glass fiber, Composite number, 02 engineering and technology, Fibre-reinforced plastic, Composite laminates, 021001 nanoscience & nanotechnology, 01 natural sciences, Clamping, low-velocity impact, Mechanics of Materials, GFRP, 0103 physical sciences, Volume fraction, General Materials Science, Wetting, Composite material, 0210 nano-technology
Abstract

The low-velocity impact behavior of polyester glass fiber composite laminates has been investigated under different clamping conditions, by wetting the specimens surface with fluids having different densities. Unidirectional composite laminates, based on polymer resin and fibers of naval interest, with different thicknesses have been manufactured by resin transfer molding process in order to have a high control of the final properties and a high fiber volume fraction. Impact tests in air have been, first, performed up to penetration on all manufactured composites having four different thicknesses to get information on the material impact behavior. The effect of the clamping conditions and the interaction of the laminates with two fluids different in density, i.e., water and paraffin oil, have been investigated, then, only on the thickest laminates that showed a lower tendency to impact damage. In particular, the impact tests have been performed by impacting the front surface of the sample and by wetting the back surface of the composite samples under unclamped and clamped conditions, replicating the boundary constraints suggested by ASTM D7136 Standard for the conventional impact tests. Experimental results showed a lower initial rigidity, higher absorbed energy and deflection for specimens exposed to liquids with respect to those exposed to air, confirming the need of taking into account the fluid interaction in the case of marine composite applications.

Published
2019

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