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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (9): 425642.doi: 10.7527/S1000-6893.2021.25642

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

Analysis and verification of nonlinear vibrations of fiber-reinforced composite cylindrical shells in thermal environment

LI Hui1,2, LYU Haiyu1,2, ZOU Zeyu1,2, LUO Zhong1,2, MA Hui1,2, HAN Qingkai1,2   

  1. 1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China;
    2. Analysis and verification of nonlinear vibrations of fiber-reinforced composite cylindrical shells in thermal environment
  • Received:2021-04-08 Revised:2021-04-26 Online:2022-09-15 Published:2021-05-21
  • Supported by:
    National Natural Science Foundation of China (52175079); The Science Foundation of the National Key Laboratory of Science and Technology on Advanced Composites in Special Environments (6142905192512); The Fundamental Research Funds for the Central Universities of China (N2103026); The China Postdoctoral Science Foundation (2020M680990); The Major Projects of Aero-Engines and Gas Turbines (J2019-I-0008-0008)

Abstract: Theoretical analysis and experimental verification of the nonlinear vibration characteristics of the fiber reinforced composite cylindrical shell in the thermal environment are conducted in this paper. Firstly, based on the strain energy density function method, complex modulus principle and polynomial fitting technique, explicit expressions of the nonlinear tensile moduli, shear moduli and loss factors of this type of composite material are proposed with consideration of amplitude and temperature dependence. Then, on the basis of the Love's shell theory, energy method and von-Kármán nonlinear strain-displacement relationship, an analytical model of the structure is established, and differential equations for vibration of the structure in the uniform thermal environment are derived, so as to solve the nonlinear resonant frequencies, damping ratios, and resonant responses of the structure. Finally, specimens of the CF120 carbon/epoxy composite cylindrical shell were tested based on a self-built thermal vibration experimental system, verifying the correctness of the model proposed as well as its analysis results.

Key words: nonlinear vibration, fiber-reinforced composite, cylindrical shell, thermal environment, parameters identification

CLC Number: