Combinatory model of curing process in epoxy composite

Investigation of epoxy matrix viscosity in the initial stage of its formation

“…In other words, from the macroscopic point of view the solutions can be regarded as heterogeneous systems with two different medium fractions. This approach is widely used to analyze the viscosity of disperse systems taking into account the interaction of particles [12] and is successfully applied in [11] to approximate the dependence of the epoxy composition viscosity on the polymerization time. This gives grounds for using the obtained experimental data (Fig.…”

“…To assess the effect of the polymerization process at the initial stage of epoxide compound formation we use a simplified version of the model of kinetics of the process proposed in [11]. Curing of the epoxy composition occurs inhomogeneously so at any time there are reacted macromolecules with chemical bonds and also there are initial macromolecules, which did not yet react.…”

“…To account the viscosity variations the Chong formula was used in the form [11]; were determined by the least squares method with the use of experimental data (see Fig. 3.).…”

The effect of different curing conditions on hardness, thickness, and residual stress of carbon fiber reinforced epoxy composites

“…1,2 The applications of CFRP composites include: retrofitting and rehabilitation (repairing) of concrete components, retrofitting and rehabilitation of steel components, internal reinforcement for concrete, aerospace applications such as space satellites and space supporting structures, automotive and other transportation industries such as airplanes wings, bodies, and turbine blades, oil and gas pipes, blast protection of structures, and waterfront structures such as marine decks. 1–7…”

“…1,2 The applications of CFRP composites include: retrofitting and rehabilitation (repairing) of concrete components, retrofitting and rehabilitation of steel components, internal reinforcement for concrete, aerospace applications such as space satellites and space supporting structures, automotive and other transportation industries such as airplanes wings, bodies, and turbine blades, oil and gas pipes, blast protection of structures, and waterfront structures such as marine decks. [1][2][3][4][5][6][7] It is well known that epoxy resin is the most used matrix in the processing of CFRP composites owing to its superior fatigue, bonding strength, and toughness when compared to other resin systems such as polyester and vinyl ester resins. These superior properties can be attributed to the aromatic groups (benzene rings) that are present in the epoxy resin, making it stronger and more thermo-stable than other resins.…”