Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 425, Issue 1-2, Pages 70-77Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2006.03.031
Keywords
three-dimensional (3D) braided; composite materials; interface; hygrothermal effects
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Epoxy resin-based composites reinforced with three-dimensional braided carbon fabric composites (C-3D/EP) were prepared by a vacuum assisted resin transfer molding (VARTM) process. In this study, the moisture absorption behavior of the C-3D/EP composites with different interface conditions was investigated. The role of interface condition was evaluated by comparing weight gain, diffusion parameters, and reductions of mechanical properties of the two 3D composites with different interface conditions, as well as by SEM observation. The weight change and diffusion parameters were determined by immersion tests and the mechanical properties degradation was investigated by examining flexural and shear properties during hygrothermal aging. It was found that moisture absorption behavior and losses of mechanical properties were interface dependent. The composites of higher interface strength showed lower moisture absorption rate (k) and diffusion coefficient (D) values at 37 degrees C and 80 degrees C, and a lower equilibrium moisture content (M-infinity) at 37 degrees C, but a higher M-infinity at 80 degrees C. A mechanism was proposed to elucidate interface dependence of hygrothermal aging. In addition, a comparison to the unidirectional composites was made to assess the influence of fiber structure. (c) 2006 Elsevier B.V. All rights reserved.
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