COMPORATIVE ANALYSIS OF HIGH-MODULUS FIBERS FOR COMBINED COMPOSITE REINFORCEMENTS

Abstract

The intensive development of research in many scientific centers of the world in the field  of creating combined (hybrid) composite reinforcement is due to the fact that the high strength and corrosion resistance of fiberglass and basalt-plastic reinforcement does not currently allow it to be widely used in building structures due to a significantly lower modulus of elasticity in comparison with steel one. The introduction of high- modulus fiber into combined composite reinforcement requires a reasonable choice of a specific type of fiber, not only in terms of price and technological parameters, but also taking into account the possible mechanisms of the multi-stage fracture process during tensile test. A comprehensive method for the structural – mechanical analysis of the mechanisms of combined composite reinforcement destruction is proposed, taking into account the type of high- modulus fibers (brittle carbon type or ductile), degree of filling, elastic moduli and indicators of strength properties (tensile strength and yield stresses). The possibility is shown and the condition for reducing the strength of combined carbon fiber glass plastics in comparison with the original glass- reinforced plastics, along with an increase in the elastic modulus at the first stage of loading, are determined. On the example of carbon fiber from the worlds leading manufacturers, as well as carbon fiber produced by the Republic of Belarus, a calculated estimate of the theoretical strength of the combined composite was made, taking into account the characteristic stage of the tension diagram, due to the mismatch between the properties of glass (basalt) and high–modulus (carbon) fiber. The results obtained make it possible to modernize the method of predictive assessment of the composite building reinforcement and can be used by engineering and technical workers of manufacturers and consumers of such reinforcement, as well as in the educational process in the training of engineering personnel of the construction profile.