Influence factors on natural frequencies of composite materials
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RESEARCH ARTICLE
Bo WANG, Feng ZHAO, Zixu ZHAO, Kunpeng XU
Influence factors on natural frequencies of composite materials
© Higher Education Press 2020
Abstract Compared with traditional materials, composite materials have lower specific gravity, larger specific strength, larger specific modulus, and better designability structure and structural performance. However, the variability of structural properties hinders the control and prediction of the performance of composite materials. In this work, the Rayleigh–Ritz and orthogonal polynomial methods were used to derive the dynamic equations of composite materials and obtain the natural frequency expressions on the basis of the constitutive model of laminated composite materials. The correctness of the analytical model was verified by modal hammering and frequency sweep tests. On the basis of the established theoretical model, the influencing factors, including layers, thickness, and fiber angles, on the natural frequencies of laminated composites were analyzed. Furthermore, the coupling effects of layers, fiber angle, and lay-up sequence on the natural frequencies of composites were studied. Research results indicated that the proposed method could accurately and effectively analyze the influence of single and multiple factors on the natural frequencies of composite materials. Hence, this work provides a theoretical basis for preparing composite materials with different natural frequencies and meeting the requirements of different working conditions. Keywords composite material, hammering and frequency sweep test, structural parameter, natural frequency
Received December 10, 2019; accepted April 14, 2020
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Bo WANG, Feng ZHAO, Zixu ZHAO, Kunpeng XU ( ) School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China; Key Laboratory of Vibration and Control of Aero-Propulsion Systems (Ministry of Education), Northeastern University, Shenyang 110819, China E-mail: [email protected]
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Introduction
Fiber-reinforced composite materials are structural composite materials that are widely used in engineering. They are composed of fibers and matrix materials. Fibers perform the main function of materials, and the matrix bonds with fibers to form a whole composite material [1]. In actual engineering, fiber-reinforced composite materials are generally designed as multilayer materials with multiple angles and multiple layers so that the materials can fully exert the bearing effect of fibers in all directions. Differences in angle and layer structures directly affect the natural frequencies of composite materials [2,3]. Therefore, the effects of different structural factors on composite materials need to be studied and analyzed. In recent years, domestic and foreign scholars have studied the factors affecting the natural frequencies of composite materials by mainly using experimental methods and numerical simulation methods. Norman et al. [4] used the finite element software ANSYS to study the free vibration characteristics of laminated beams under di
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