Influence factors on natural frequencies of composite materials

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

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Acknowledgements

This work was supported by the Fundamental Research Funds for the Central Universities of China (Grant No. N180304021), the National Science Foundation for Postdoctoral Scientists of China (Grant No. 2019M651125), and the National Natural Science Foundation of China (Grant No. U1708257).

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2020 Higher Education Press