Hybrid Carbon/Glass Fiber Reinforced Polymer; A Frontier Material for Aerospace Industry : A Review on Mechanical Properties Enhancement

Composite is the combination of two or more materials that differ in properties and composition to form unique properties. This paper reported in the literature on the field of deformation of hybrid composite under tensile, shear and flexural loading are presented in this chapter. This article review provides insight and state of the art for mechanics of composites that provides underlying theory for understanding the deformation and behaviour for the hybrid composite under various loading conditions. This paper also discusses mechanical behaviour of hybrid composites under static loading (Tensile, Shear, Flexural). It is essential to understand the principle that governs the mechanics of composites of laminate under loading which also applicable to hybrid composites C/GFRP.The high modulus fibre, such as Carbon fibre offers stiffness and load bearing capabilities, whereas the low modulus fibre, such as glass fibre makes the composite more durable and low in cost

Evaluation of influence of method for preparing on microporosity of sintered polytetrafluoroethylene-based compositions

The aim of the work is to assess the influence of the method for preparing on the porosity of sintered polytetrafluoroethylene blanks as well as PTFE mixtures with carbon fiber and additives of powdered graphite. The article provides a comparative analysis of the method for preparing influence on the microporosity of sintered blanks made of filled and unfilled polytetrafluoroethylene. Microporosity has been determined through the comparison of the actual and theoretical (for a non-porous material) density of blanks, calculated by the methods of structural mechanics of composites. The studies made it possible to establish that the porosity of the unfilled polytetrafluoroethylene blanks pressed at a pressure of 70…80 MPa stands at 1.3 to 5.9 %. An exception was a specimen obtained by sintering in a jig, which has reached apparent density 2200 kg/m3 equal to theoretical density. It has been established, that the porosity of blanks obtained from polytetrafluoroethylene filled with shredded carbon fiber and powdered graphite stood at 0.4 to 3.9 %. An exception was a specimen with a high mass content of filler (40 %), in which the porosity was 16 %. It has been ascertained that sintering in a constrained state helps to reduce the residual microporosity for both the filled and unfilled polytetrafluoroethylene. This shows the technical efficiency of sintering in a constrained state, despite the increased labor intensity of the manufacturing process and the sophistication of technical equipment.

Расчет нормальных температурных напряжений в компонентах асфальтобетона методами статистической механики композитов

Учет температурных напряжений важен при выполнении расчетов на прочность дорожного покрытия. В данной статье приводятся результаты исследования распределения нормальных температурных напряжений для компонент асфальтобетона. Показано логарифмически нормальное распределение нормальных температурных напряжений для включения и распределение Гаусса для нормальных температурных напряжений связующего. Исследование проведено с применением теоретических методов статистической механики композитов, аналитических методов решения статистической краевой задачи механики композитов, математического моделирования, методов программирования в математическом пакете MathCad. Ключевые слова: асфальтобетон, температурные напряжения, статистическая краевая задача механики композитов, математическое моделирование, пакет программ. Consideration of temperature stresses is important when performing calculations of road surface strength. The results of study of the distribution of temperature stresses components for asphalt concrete are given herein. Lognormal distribution of components of thermal stresses for inclusion and normal distribution of components for thermal stresses of thebinding agent are shown. The study was carried out using theoretical methods of mechanics of composites, analytical methods for solving the statistical boundary value problem of mechanics of composites, numerical and experimental modelling, programming methods in the mathematical package MathCad. Keywords: asphalt concrete, temperature stresses, statistical boundary value problem, mechanics of composites, numerical experiment, laboratory experiment.