The effects of coupling mechanisms on the dynamic analysis of composite shaft

Abstract

The composite shaft has been widely applied to many fields such as aerospace and automotive industries due to its excellent engineering properties. The accurate dynamic analysis of composite shaft, which is of great importance for the stable operation of high speed-rotating machine, however, is relatively complex due to the anisotropic properties of composite material. In this study, the dynamic behavior of composite shaft that considers the laminate coupling effect is investigated. At first, a simplified homogenized beam theory (SHBT) is modified so as to take account of the essential properties of composite material such as Poisson's effect and the bending-twisting coupling effect in addition to the transverse shear deformation, the gyroscopic effect and the rotational inertia. Then a homogeneous finite element-beam model with 10 degrees of freedom and without internal damping is introduced as the study object to compare the proposed method and equivalent modulus beam theory (EMBT), the modified EMBT, SHBT and ABAQUS. The results by the modified SHBT are consistent with those obtained by different theories. In conclusion, the proposed method can be effectively applied to the dynamic analysis of composite shaft.