Abstract
ABSTRACT The coupled axial-torsional vibrations of a composite beam in hygrothermal environments are studied. In the existing literature, most studies investigated the torsional/axial-bending vibrations of rotating composite beams. Few works considered the axial-torsional vibrations in hygrothermal environments. By considering this, the coupled axial-torsional vibration characteristics of composite thin-walled beams in hygrothermal environments are studied. Vibration characteristics are solved using the Rayleigh-Ritz method. The accuracy of the calculation results is verified using the finite element method. The following conclusions are obtained: (1) The frequencies decrease with the hygrothermal factors and mounting angle. (2) Compared to temperature, moisture has a smaller impact on frequencies. (3) The influence of rotating speed and mounting angle is minimal and can be ignored. (4) The influences of ply angle on frequencies are more significant than other parameters. (5) The axial inertia force decreases torsional frequencies when the ply angle is 15°~75°. (6) The influences of temperature, moisture, rotating speed, and mounting angle on the first two modes are very small and can be ignored.
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