Journal
COMPOSITE STRUCTURES
Volume 315, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2023.117009
Keywords
Braided composites; Nonlinear vibration; Aeroelastic effect; Dynamic response; Fatigue life
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In this paper, a novel aerodynamic-acoustic coupling model is proposed to investigate the influence of aeroelastic effects on the thermo-acoustic response of a three-dimensional, four-directional braided composite panel. The fatigue life under combined aerodynamic load and acoustic load is discussed by using a rainflow cycle counting method. The results show that aeroelastic not only transforms the movement form but also affects the fatigue life of the panel.
In this paper, a novel aerodynamic-acoustic coupling model to investigate the influence of aeroelastic effects on the thermo-acoustic response of three-dimensional, four-directional braided composite panel is proposed, and the fatigue life under the combined aerodynamic load and acoustic load is discussed by using a rainflow cycle counting method. Assuming that the fibers are transversely isotropic and the matrix is isotropic, the fiber inclination model was used to predict the effective stiffness matrices of the composite panels. The piston theory and Gaussian random acoustic excitation were used to simulate the aerodynamic load and acoustic load, the thermal load is assumed to be a uniform distribution in steady state, and the material properties are assumed to be independent of temperature. Based on the von-Karman strain-displacement relation, the governing equations of the panel were formulated, and the response solutions of the four sides simply supported panel were obtained using Galerkin method and Runge-Kutta method. The aeroelastic effect on the thermos-acoustic response of the braided composite panel was investigated in time and frequency domains, and the life of different load conditions was predicted. The results show that the aeroelastic not only transforms the movement form, but also affects fatigue life of the panel.
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