VESTNIK of Samara University. Aerospace and Mechanical EngineeringVESTNIK of Samara University. Aerospace and Mechanical Engineering2542-04532541-7533Samara National Research University609410.18287/2541-7533-2018-17-1-100-117UnknownСhoice of materials for producing dimensionally stable load-carrying structuresBitkinV. E.<p><span lang="EN-US">First Deputy General Director, General Designer for Measuring Systems</span></p>gksi@sktb-plastik.ruZhidkovaO. G.<p><span lang="EN-US">Deputy General Designer for Scientific Research</span></p>opriokr-prg@sktb-plastik.ruKomarovV. A.<p><span lang="EN-US">Doctor of Science (Engineering), Professor</span></p>vkomarov@ssau.ruLLC Special Development and Technology Bureau PlastikSamara National Research University250420181711001172504201825042018Copyright © 2018, VESTNIK of Samara University. Aerospace and Mechanical Engineering2018<p>The article deals with the problems of choosing materials for producing dimensionally stable load-carrying structures of space optical electronic complexes. Physical and mechanical properties of successfully applied and promising composite materials obtained by theoretical and experimental research are presented. A comparative analysis of properties of carbon-filled plastics is given according to the percentage of filler content in a composite matrix and the elastic modulus of carbon fiber. Experimental data related to the properties of carbon-filled plastics based on various fibers are presented. The dependence of the temperature coefficient of linear expansion (TCLE) of various carbon-filled plastics with unidirectional and quasi-isotropic structures is studied theoretically and experimentally. The stability of TCLE is shown to be approximately equal to110<sup>-6</sup> ˚C<sup>-1</sup> in the area with 50-60% volume filler content. The TCLEs and elastic moduli of carbon-filled plastics and optical glasses of telescope elements are compared. The task of developing a composite material with a TCLE value characteristic of titanium alloys is discussed. Recommendations for applying the analyzed composite materials in the development of dimensionally stable space structures are given.</p>Композитыконструкцииразмеростабильностьуглеродные волокнаэпоксидное связующееуглепластикипроектированиеComposite materialsstructuresdimensional stabilitycarbon fiberepoxy bindercarbon-filled plasticsdesign[1. Testoedov N.A., Dvirniy G.V., Permyakov M.Yu. Temperature deformation value definition of size stable reflectors. Vestnik Sibirskogo gosudarstvennogo aerokosmicheskogo universiteta imeni akademika M.F. Reshetneva. 2011. No. 2 (35). P. 67-71. (In Russ).][2. Popov N.N, Filonov A.S., Dontsov G.A. Vursol A.V., Rodimkina E.Yu., Matveev D.S. Structural materials of optical modules for Earth’s remote sensing. 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