Effects of hygrothermal aging on the thermomechanical properties of a carbon fiber reinforced epoxy sheet molding compound: An experimental research

Carbon fiber sheet molding compounds (C‐SMCs) are discontinuous fiber reinforced composite materials. Among them, epoxy‐based C‐SMCs are becoming relevant materials due to their high thermomechanical performance and better formability than continuous fiber reinforced composites. The thermomechanical...

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Bibliographic Details
Published in:Journal of applied polymer science 2021-03, Vol.138 (11), p.n/a
Main Authors: Zulueta, Kepa, Burgoa, Aizeti, Martínez, Iñaki
Format: Article
Language:English
Subjects:
Aging
Carbon fiber reinforced plastics
Carbon fibers
Carbon-epoxy composites
Composite materials
composites
Continuous fiber composites
Diffusion coefficient
Dynamic mechanical analysis
Epoxy resins
Fiber composites
Fiber reinforced polymers
glass transition
hydrophilic polymers
Materials science
mechanical properties
Moisture content
Polymers
Relative humidity
Sheet molding compounds
Test chambers
Thermomechanical properties
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Summary:Carbon fiber sheet molding compounds (C‐SMCs) are discontinuous fiber reinforced composite materials. Among them, epoxy‐based C‐SMCs are becoming relevant materials due to their high thermomechanical performance and better formability than continuous fiber reinforced composites. The thermomechanical performance of epoxy resins and epoxy based continuous carbon fiber composites have shown to be influenced by hygrothermal aging. In this work, this influence is studied for an epoxy‐based C‐SMC. Epoxy‐based C‐SMC samples were hygrothermally aged by means of accelerated conditioning, exposing them to 65% relative humidity, and 80°C in a climatic chamber. The equilibrium moisture content, as well as the moisture diffusion coefficient has been determined. The thermomechanical properties of epoxy C‐SMC have been analyzed by dynamic mechanical analysis, tensile, 3‐point bending, and short beam tests in dry and aged samples. The results showed that epoxy C‐SMC is affected by hygrothermal aging in the cases of moisture intake and its effects on Tg value, but interestingly, the hygrothermal aging did not generate any degradation effects in the mechanical response of epoxy C‐SMC. Epoxy‐based carbon fiber sheet molding compound (C‐SMC) is affected by hygrothermal aging in the cases of moisture intake and its effects on Tg value, but interestingly, the hygrothermal aging did not generate any degradation effects in the mechanical response of epoxy C‐SMC.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.50009