Exploitation Of Elastic-viscoelastic Composite Structure Element

In recent years, elastic-viscoelastic composite structures are widely utilized in the reduction of structural vibrations. When using existing FE software to calculate elastic-viscoelastic composite structures, the value of each material property is constant. But the frequency-dependent mechanical properties of viscoelastic materials lead to the results that modal frequencies and material properties are not in accord with experimental results. Therefore, in this work, two super elements are developed for the composite structures. One is girder finite element; the other is plank finite element.First, in this paper, it measures the former three frequencies and the loss factors through amplitude-frequency curves. Then according to the cascade property of the elastic-viscoelastic structures, and the viscoelastic material is the interlayer, it deduces the elastic matrix, mass matrix and viscoelastic matrix of the two new integral finite elements separately. In order to prove the reliability of the two elements, it calculates the natural frequency and loss factor of the experimental cantilever using different number of the two integral finite elements and compared with the experimental results.At the same time, considering that the structure may be partially constrained-layer treated, and reviewing the two new elements'harmony with other elements, it uses integral finite elements and other elements together to calculate the natural frequency and loss factor of different structure. The results show that this strategy is very feasible.