A compression shear mixed finite element model for vibration and damping analysis of viscoelastic sandwich structures

摘要

A finite element model is developed to investigate the vibration and damping of elastic-viscoelastic-elastic sandwich beams. Two energy dissipation mechanisms, namely the shear and compression damping, are combined in the finite element model. Numerical examples are provided to verify the finite element model. The vibration and damping characteristics of the viscoelastic sandwich beams are investigated in detail. The numerical results show that the present finite element model has a good accuracy in predicting the natural frequencies and loss factors of viscoelastic sandwich beam structures. Moreover, it shows good applicability for both the thin and relatively thick sandwich beams. Its comprehensive performance is much better than the traditional shear and compression damping models. The effect of the viscoelastic material and geometrical parameters on the natural frequencies and loss factors of elastic-viscoelastic-elastic sandwich beam is studied as well. The results obtained have some significance in engineering application.