Mechanical and dynamic mechanical analysis of hybrid composites molded by resin transfer molding

Abstract

This work aims to evaluate the performance of glass/sisal hybrid composites focusing on mechanical (flexural and impact) and dynamic mechanical analyses (DMTA). Hybrid composites with different fiber loadings and different volume ratios between glass and sisal were studied. The effect of the fiber length has also been investigated. The densities of the composites were compared with the theoretical values, showing agreement with the rule of mixtures. The results obtained in the flexural and impact analysis revealed that, in general, the properties were always higher for higher overall reinforcement content. By DMTA, an increase in the storage and loss modulus was found, as well as a shift to higher values for higher glass loading and overall fiber volume. It was also noticed an increase in the efficiency of the filler and the calculated activation energy for the relaxation process in the glass transition region. The fiber length did not significantly change the results observed in all analyses carried out in this work. The calculated adhesion factor increased for higher glass loadings, meaning the equation may not be applied for the system studied and there are other factors, besides adhesion influencing energy dissipation of the composites.

Mechanical, dynamic mechanical and morphological properties of composites based on recycled polystyrene filled with wood flour wastes

“…The addition of wood flour caused an increasing on the storage modulus of rPS matrix, as can be seen in Figure 4 (a). This may be associated with the increase in the stiffness of the matrix due the reinforcement effect caused by the wood flour (Mohanty et al 2006, Ornaghi Jr. et al 2010. The storage modulus for treated composites is higher than the untreated composites.…”

Viscoelastic properties of carboxyl-terminated (butadiene-co-acrylonitrile)-based composite rocket propellant containing tris (2,3-epoxypropyl) isocyanurate as bonding agent

“…Modulus in the glassy state is determined primarily by the strength of the intermolecular forces and the way the polymer chains is packed [25]. The increase in storage modulus values with increasing TEIC content suggests that a tougher, more rigid network is obtained at higher TEIC concentrations.…”

Examination of the Thermo-mechanical Properties of E-Glass/Carbon Composites

“…It measures the modulus and damping properties of materials [10][11][12]. Fibre-reinforced composites are exposed to di erent types of dynamic stresses during handling, which demonstrates the importance of analysing the viscoelastic properties of composite materials [13]. Di erential scanning calorimetry (DSC) is a thermal analysis method that measures heat ow rate as a function of time and temperature [14].…”