Analysis of three-dimensional thermal vibration coupling characteristics of composite shaft under axial load

The Carrera unified formulation (CUF) is employed to simplify the complete three-dimensional dynamic model based on the three-dimensional elasticity theory into a hierarchical one-dimensional dynamic model that maintains three-dimensional solution accuracy. The displacement function is formulated using Taylor polynomials and the improved Fourier series method (IFSM). Subsequently, the study solves the thermal vibration characteristics of the composite shaft under axial load through the application of energy functional and Hamilton's principle. The accuracy and stability of the present method are verified by comparing the present results with simulation. This study investigates the influence of thermal effects, structural parameters, and axial load on the vibrational characteristics of the composite shaft. The analysis results indicate that temperature, structural parameters, and axial load all significantly affect the fundamental properties of the composite shaft. As temperature and length-radius ratio increase, the natural frequency of the composite shaft gradually decreases. Regarding axial load, axial tension exhibits a positive correlation with the structure's natural frequency, whereas axial pressure shows a negative correlation. These findings hold significant engineering implications for utilizing composite shaft in the marine engineering sector.