Data of carbon fiber reinforced plastics curing under complex temperature programs

This work is devoted to the study of CFRP hardening processes. Anisotropy assessment of ultimate strength in static bending is presented. Particularly interesting work is in the fact that the study of carbon fiber-reinforced plastic obtained by hardening in a complex temperature regime. The method of dielectric spectroscopy was used to study the curing of the composite. It was found that, due to a temperature gradient of 8 ° C, the gel point of colder prepreg layers occurs at 4.2 minutes. A method for estimating the gelation time by dielectric spectroscopy is proposed. It was found that the point of gel formation coincides with the minimum extremum on the graph of the derivative of the tangent of the dielectric loss angle versus time. In the graph of the tangent of the dielectric loss angle versus time A technique for modifying carbon fiber reinforced plastic is presented, which contributes to the achievement of uniform gelation throughout the entire thickness of the prepreg. The effect is achieved by introducing a curing catalyst in specified concentrations into various layers of the prepreg. The ultimate strength in static bending of modified CFRP increases by 1.2 times.The anisotropy of the static bending strength in the modified sample is reduced by 11.9%.