Dynamic characteristics of composite drive shaft in complex environment based on Carrera unified formulation

This article uses Carrera unified formulation (CUF) to analyze the dynamics characteristics of composite shaft with consideration of thermal effects, axial loads, and rotational speeds. The shaft radial displacement is described by Taylor expansion terms, and the axial displacement is described by improved Fourier series. Hamilton's principle is used to obtain the control equations. The calculation results indicate that: The increase of temperature can reduce composite shaft natural frequency, and the influence is not obvious when the layer angle is small; The effect of axial load on composite shaft natural frequency is roughly linear, but the influence varies under different boundaries, length-radius ratio, layer orders; Due to the gyroscopic effect, the natural frequency of the composite shaft exhibits two states under the action of rotation speed: forward and backward mode; In forward mode, the influence of temperature and axial load on the composite shaft still follows the previous conclusion; In the backward mode, when the rotational speed exceeds the critical speed, the influence of temperature and axial load on the composite shaft shows the opposite conclusion. These findings are of great significance for the practical application of composite shaft in engineering.