Coupling Effects and Resonant Characteristics of Rotating Composite Thin-Walled Beams in Hygrothermal Environments

This study focuses on coupled vibrations of rotating thin-walled composite beams subjected to hygrothermal effects. In the existing literature, many studies have been conducted on coupled bending-torsional vibration and resonance in hygrothermal environments. Few studies considered the coupled flapwise-edgewise and resonances of composite thin-walled beams. Considering this, the flapwise-edgewise coupling effects and resonant characteristics of rotating thin-walled composite beams in a hygrothermal environment are studied. The Rayleigh–Ritz method is used to solve the equations of the beam. Results indicate that flapwise-edgewise coupling factors are essential for the vibration analysis of rectangular thin-walled beams. The ply angle and setting angle strongly affect the internal and external resonances. Large ply angles can significantly reduce the chances of primary internal and external resonances occurring when the permitted rotational speed is lower.