Cure kinetics determining of parts made of polymer composite materials based on epoxy binders


Аuthors

Yangyang Chen 1*, Pyi Phyo Maung 1, 2

1. Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia
2. Bauman Moscow State Technical University, MSTU, 5, bldg. 1, 2-nd Baumanskaya str., Moscow, 105005, Russia

*e-mail: yangyangchen@mail.ru

Abstract

The article presents the results of theoretical and experimental studies of cure kinetics of the glass-fiber and carbon fiber-reinforced plastics fabricated on the basis of the epoxy binder.The authors suggest application of the values of temperature gradients over the thickness as an op-timality criterion of the heating rate. Samples of glass-fiber and carbon fiber-reinforced plas-ticsfabricated on the basis of the epoxy binder were employed as objectsofresearch. Theoretical computations, using ESI PAM-RTM program, were performed to determine temperature fields on the surface and inside a sample. The heat release value, being determined experimentally for different cure rates, was used as the initial data for modelling. It was established, that with one and the same cure mode, the temperature gradients values for the glass-fiber samples were higher, than for those similar of carbon fiber-reinforced plastics.

Today composite products are widely used in various fields, especially in mechanical engi-neering, aircraft manufacturing, space rocket production, due to their advantages such as high specific strength, high specific modulus, corrosion resistance, able to design and so on. Compo-site materials need to be cured from raw materials to forming. One of the most important tasks in the manufacture of composite products is to improve their quality. The curing process affects the quality of products. This article investigated the kinetics of the curing process of Glass fiber reinforced plastic (GFRP) and carbon fiber reinforced plastic (CFRP). The research object is GFRP and CFRP based on epoxy resins. The heat release curve of the resin under different heating rate was obtained through experimental research and the curing kinetic parameters of the resin were obtained according to the curve. Based on the experimental curing kinetic para-meters and the relevant curing kinetic model, the curing process of the GFRP and CFRP was theoretically simulated by using the ESI PAM-RTM program. Finally, the temperature field, curing degree field and heat dissipation rate of GFRP and CFRP under the same curing model were obtained. In order to analyze the temperature field, the temperature gradient over the thickness of parts was used. It is concluded that the temperature gradient in the GFRP is higher than that in the CFRP under the same curing mode.

Keywords:

composite material, curing kinetics, temperature gradient.

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