A structural-mechanical analysis of the influence of high-modulus fibers on the physical and mechanical properties of hybrid composite reinforcement has been performed. In the introduction, the need for a detailed physical and mechanical analysis of the properties of combined composite reinforcement is updated due to the insufficient study of many issues. Despite the progress made in the field of modeling structural composite reinforcement and the development of its production technology, many issues related to its strength are not well understood, which is the main constraint in the adoption of scientifically based standards for assigning mechanical characteristics, control and testing methods. The aim of the study is to develop methods and use them to carry out a structural-mechanical analysis of the influence of the type and content of high-modulus fibers on the density and elastic moduli of hybrid composite reinforcement. In the main part of the article, mathematical modeling of the possible mechanism of destruction of combined rods with different content of high-modulus reinforcing fibers and base fibers was carried out. At the first stage, a structural-mechanical analysis of the factors contributing to the increase in the moduli of longitudinal elasticity described by the “rule of mixtures” was carried out. In this case, the influence of the mass and volume content of high-modulus fibers on the density of the hybrid composite, as well as its moduli of longitudinal and transverse elasticity, was modeled. The results obtained make it possible to modernize the method of predictive assessment of the density and elasticity moduli of 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.
A structural and mechanical analysis of the effect of polymer binder technological shrinkage on the destruction mechanisms and strength at break of construction composite reinforcement has been carried out. Using the results of our own experimental studies, as well as published data of other researchers, the differences in the destruction mechanisms of fiberglass and carbon fiber reinforcement are shown. A calculated assessment of the polymer shrinkage effect in the anchor sleeve on the appearance of additional shrinkage stresses in the interface between the reinforcement bar and the test anchor sleeve has been made. The results obtained make it possible to modernize the methodology for predictive assessment of the strength of composite construction 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 preparation of engineering personnel for the construction profile.
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