Application of dynamic mechanical analysis for the study of the interfacial region in carbon fiber/epoxy composite materials

Abstract

The application of dynamic mechanical analysis (DMA) for quantifying interfacial interactions in composites is briefly reviewed. Carbon fiber/epoxy composites with fiber volume fractions of 12, 17, 38 and 61 vol% were subjected to flexural deformation on a Dupont DMA 983 instrument. The dependencies of dynamic mechanical properties of the composites on experimental parameters such as oscillation mode, amplitude, frequency, and temperature were investigated. As opposed to the storage modulus, the loss modulus is found to be sensitive to all parameters. In a fixed multiple frequency mode, the loss modulus of the composites increases with oscillation amplitude and decreases with frequency and the number of tests. The information produced in the resonant mode is more reproducible. An additional damping at the interfaces, apart from those of the constituents, suggests a poor interface adhesion in these composites. A linear relationship between the excess damping at the interfaces and the fiber volume fraction shows a similar interface quality for these composites having different fiber volume fractions. The detection of interfacial properities was found to be more sensitive in the flexural deformation mode than in the torsional mode. At temperatures higher than the glass transition temperature of the matrix, the effective volume fraction of the matrix is reduced. Such a reduction can be interpreted from the mismatch of thermal expansion of the matrix and the fibers.

Chemical Modification of Oil Palm Mesocarp Fiber by Methacrylate Silane: Effects on Morphology, Mechanical, and Dynamic Mechanical Properties of Biodegradable Hybrid Composites

“…Silane-treated OPMF composites showed lower damping than unmodified OPMF composites. As the damping at the interface increases, the interfacial adhesion between fibers and matrix becomes weaker (Dong and Gauvin 1993). Tan δ results indicated that silane-treated OPMF formed good interfacial adhesion with the matrix in hybrid composites, as composites with strong interfacial bonding tend to dissipate less energy compared with composites with poor interfacial bonding.…”

Low-cost, environmentally friendly route for producing CFRP laminates with microfibrillated cellulose interphase

“…It is worth pointing out that the tan δ curves in Figure 6b provide not only the T g values of both the evaluated composite laminates, but also express their damping ability, which can be inferred from the magnitude of the tan δ peak [32]. Several studies have shown that the magnitude of tan δ in continuous fiber-reinforced polymer matrix composites is inversely proportional to the fiber/matrix mergence [33,34]. It can, therefore, be concluded from T g values and peak heights of the tan δ curves depicted in Figure 6b that a stronger bond between the CF and epoxy matrix phases was achieved by incorporating the MFC hierarchical substructure directly onto the originally unsized-CF framework before the RIFT process.…”

Mechanical and dielectric properties of epoxy/dicyclopentadiene bisphenol cyanate ester/glass fabric composites

“…Among many research works, parameter B which corrects the volume fraction of reinforcement because of the formation of a layer of immobilized interphase resulting from strong interactions at the interface is the particularly worth mentioning one conducted by Dong and Gauvin [22]. Therefore, we chose the parameter B to evaluate the interfacial adhesion between the fibers and matrix.…”