热环境下纤维增强复合材料圆柱壳非线性振动分析与验证

doi:10.7527/S1000-6893.2021.25642

Abstract

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:

V257
O313.4

LI Hui, LYU Haiyu, ZOU Zeyu, LUO Zhong, MA Hui, HAN Qingkai. Analysis and verification of nonlinear vibrations of fiber-reinforced composite cylindrical shells in thermal environment[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(9): 425642-425642.

References

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

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