Structural and mechanical modeling of density and stiffness of hybrid composite reinforcement

Abstract

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.