Effect of moisture absorption on the mechanical behavior of carbon fiber/epoxy matrix composites

A carbon fiber/epoxy unidirectional laminated composite was exposed to a humid environment and the effect of moisture absorption on the mechanical properties and failure modes was investigated. The composites were exposed to three humidity conditions, namely, 25, 55, and 95 % at a constant temperatu...

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Veröffentlicht in:Journal of materials science 2013-03, Vol.48 (5), p.1873-1882
Hauptverfasser: Pérez-Pacheco, E., Cauich-Cupul, J. I., Valadez-González, A., Herrera-Franco, P. J.
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container_end_page 1882
container_issue 5
container_start_page 1873
container_title Journal of materials science
container_volume 48
creator Pérez-Pacheco, E.
Cauich-Cupul, J. I.
Valadez-González, A.
Herrera-Franco, P. J.
description A carbon fiber/epoxy unidirectional laminated composite was exposed to a humid environment and the effect of moisture absorption on the mechanical properties and failure modes was investigated. The composites were exposed to three humidity conditions, namely, 25, 55, and 95 % at a constant temperature of 25 °C. The carbon fiber–epoxy laminated composites for two different carbon fiber surface treatments were used. The results showed that the mechanical properties differ considerably for each fiber surface treatment. The application of a coupling agent enhanced the fiber-matrix adhesion and reduced dependence of the properties on humidity. The damage mechanism observed at micromechanical level was correlated to acoustic emission signals from both laminated composites. The untreated carbon fiber failure mode was attributed to fiber-matrix interfacial failure and for the silane-treated carbon fiber reinforced epoxy laminate attributed to matrix yielding followed by fiber failure with no signs of fiber-matrix interface failure for moisture contents up to 1.89 %.
doi_str_mv 10.1007/s10853-012-6947-4
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subjects Absorption
Acoustic emission
Acoustic emission testing
Carbon fiber reinforced plastics
Carbon fibers
Carbon-epoxy composites
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Composite materials industry
Coupling agents
Crystallography and Scattering Methods
Dependence
Epoxy matrix composites
Epoxy resins
Failure
Failure modes
Fiber reinforced polymers
Fiber-matrix adhesion
Fibers
Humidity
Laminated materials
Materials Science
Mechanical properties
Moisture
Moisture absorption
Polymer Sciences
Silane
Solid Mechanics
Surface chemistry
Surface treatment
title Effect of moisture absorption on the mechanical behavior of carbon fiber/epoxy matrix composites
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