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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Evaluation of glass transition temperature of the repaired polymeric composites of aeronautical use

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Author(s):
Jane M. F. de Paiva [1] ; Sérgio Mayer ; Geraldo M. Cândido [3] ; Mirabel C. Rezende [4]
Total Authors: 4
Affiliation:
[1] Brasil. Ministério da Defesa. Comando-Geral de Tecnologia Aeroespacial (CTA). Instituto de Aeronáutica e Espaço (IAE) - Brasil
[3] Centro Técnico Aeroespacial
[4] Centro Técnico Aeroespacial
Total Affiliations: 4
Document type: Journal article
Source: POLIMEROS-CIENCIA E TECNOLOGIA; v. 16, n. 1, p. 79-87, 2006-03-00.
Field of knowledge: Engineering - Aerospace Engineering
Abstract

This work shows the evaluation of the glass transition temperature (Tg) by DMTA of three different families of repaired polymeric composites, manufactured with carbon fiber fabric/epoxy F584, glass fabric/epoxy F161 and aramide fabric/epoxy F161, respectively. The composites were laminated by conventional hand lay-up process used in aeronautical industry. Afterwards, simulated damages, scarf type, were made and overlapping layers of F155 epoxy resin prepregs repaired them. The DMTA curves show the effects of combination of different systems resins on the Tg values and, consequently, on the service temperature of the repaired laminate. The used repairing material (based on epoxy resin F155 and on epoxy adhesive film FM73) decreased the Tg of the repaired laminates in approximately 30 °C for the carbon and glass laminates. The conditioning of aramide laminate under elevated humidity and temperature provoked a more decrease of the Tg (reduction of approximately 40 °C). The Tg reduction for the repaired laminates is attributed to the adhesive film migration into the F155 resin system during the cure process and also to the resin plasticization by water diffusion during the hygrothermal conditioning. The Tg reduction leads to a decrease of the service temperature of the repaired polymeric composite. (AU)