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TitleEffects of different environmental conditions on the mechanical characteristics of a structural epoxy
Author(s)Silva, Patrícia Moreira
Fernandes, Pedro Miguel Gomes
Sena-Cruz, José
Xavier, José
Castro, Fernando
Soares, Delfim
Carneiro, Vítor Hugo Pimenta
KeywordsThermosetting resin
Chemical properties
Mechanical properties
Thermal analysis
B. Chemical properties
B. Mechanical properties
D. Thermal analysis
E. Thermosetting resin
Issue date2016
JournalComposites Part B: Engineering
Abstract(s)With the aim of characterising a commercially available epoxy adhesive used for fibre-reinforced polymers strengthening applications, when submitted to different environmental conditions, mainly thermal (TC), freeze-thaw (FT), and wet-dry (WD) cycles and immersion in pure (PW) and water with chlorides (CW) for periods of exposure that lasted up to 16 months, an experimental program was carried out. Several methodologies were used in its characterization, mainly the scanning electron microscope (SEM), dynamic mechanical analysis (DMA), standard tensile tests (STT) coupled with digital image correlation (DIC). In general the results revealed that the chemical composition was not affected by the environmental conditions. Nevertheless, it was verified through DMA and STT that the modulus of elasticity and tensile strength of the epoxy adhesive increased in the TC, while the specimens submitted to PW and CW faced a high degradation in terms of its mechanical properties. Eventually, the glass transition temperature (Tg) was not affected by the environmental conditions, apart from the specimens subjected to TC and FT, presenting a higher and lower Tg, respectively, when compared with the reference specimens.
AccessOpen access
Appears in Collections:ISISE - Artigos em Revistas Internacionais

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