Finite element analysis for vibration of a viscoelastic sandwich beam based on composite energy dissipation hypothesis

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (5) : 106-115.

HUANG Zhicheng1, LIU Liya1, WU Nanxing1,　WANG Xingguo1, CHU Fulei2

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Abstract

A new finite element (FE) model was established to study vibration and damping characteristics of a viscoelastic sandwich beam considering shear and compressive damping of viscoelastic layer. The constraint layer and base beam layer of a viscoelastic sandwich beam were regarded as an Euler-Bernoulli one during modeling. Its intermediate viscoelastic layer was assumed to be subjected to both longitudinal shear and transverse compression deformations for the purpose of dissipating vibrational energy. Vibration and damping characteristics of the beam with different boundary conditions and geometric parameters were studied using this FE model. Compared with the results of the precise analytical method and other commonly used numerical ones, it was shown that the proposed FE model has good accuracy and applicability; in predicting natural frequency and loss factor for sandwich beam structures, its accuracy is higher than those of several conventional numerical models. Finally, the correctness of this FE model was further verified with the test results.

Key words

Viscoelastic sandwich beam / Vibration analysis / complex dissipating energy / Finite element method

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HUANG Zhicheng1, LIU Liya1, WU Nanxing1,　WANG Xingguo1, CHU Fulei2. Finite element analysis for vibration of a viscoelastic sandwich beam based on composite energy dissipation hypothesis[J]. Journal of Vibration and Shock, 2019, 38(5): 106-115

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