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Study of long term behavior in hybrid composites processed by RTM

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Author(s):
Dielly Cavalcanti da Silva Monte Vidal
Total Authors: 1
Document type: Master's Dissertation
Press: Guaratinguetá. 2017-06-08.
Institution: Universidade Estadual Paulista (Unesp). Faculdade de Engenharia. Guaratinguetá
Defense date:
Advisor: Maria Odila Hilário Cioffi; Sérgio Roberto Montoro
Abstract

Composites are attractive materials for the aircraft industry due to have high mechanical strength to a significantly underweight, which make possible the cost reduction keeping, at the same time physical properties. The use of different reinforcements it is possible and, then, the composite is characterized as hybrid, which have benefit to combine advantages of different fibers, reducing, simultaneously, their less desirable characteristics. Among the RTM, it has been of great interest due to the ease of manufacture in a relatively low cost compared to other traditional methods such as autoclaving. However, because it is a process in which a closed rigid mold is used, many residual stresses could be occurred in the matrix. Furthermore, regarding hybrid composites, during the cure process changes in properties related to the relaxation phenomenon of the polymeric chains could occur, which has a great influence on the physical properties of the advanced composite. Therefore, it is essential to have information about the relaxation phenomena, which is provided by dynamic mechanical analysis. The objective of this work was to understand the effect of two different reinforcements in the relaxation phenomena of epoxy matrix through viscoelastic properties. These properties were obtained by dynamic mechanical analysis of the hybrid composite reinforced with carbon fiber glass epoxy matrix, which was processed by RTM and compared to those produced with carbon fiber and glass fiber. By DMA analysis was possible to observe the relaxation phenomena to all composites and the positive hybrid effect was determined, furthermore the higher fiber/reinforce interfacial adhesion for these composites. (AU)

FAPESP's process: 15/10906-2 - Characterization of hybrid advanced composite: RTM processing
Grantee:Dielly Cavalcanti da Silva Monte Vidal
Support Opportunities: Scholarships in Brazil - Master