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所属单位：航空学院
发表刊物：INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
关键字：Wave propagation Anisotropic viscoelasticity Dispersion curves Mode shapes Branch switch Analytical solution
摘要：We investigate wave propagation in generally anisotropic viscoelastic plates. The generally anisotropic material system has 21 independent complex coefficients in its stiffness matrix when viscoelasticity is taken into account. The dispersion equation is obtained in the form of determinant vanishing in the complex domain based on the straightforward derivation. An accurate root-searching in the dispersion equation for arbitrary ranges of frequencies and complex wavenumbers, however, is very difficult, if not impossible. In this paper, a novel algorithm is introduced to calculate the 3D dispersion curves. An approximate solution in the low attenuation range via the semi-analytical finite element (SAFE) method is also used to compare and validate the introduced algorithm. Using this algorithm, various peculiar wave features are then investigated in details. These include the attenuation jump and branches exchange in viscoelastic model caused by conversion of wave mode shapes, and the veering of dispersion branches in the corresponding elastic medium. The general anisotropic (viscoelastic/elastic) models are further compared with the isotropic ones to identify the similarity and difference on wave features between them. The proposed accurate algorithm along with the observed features should be particularly useful in non-destructive evaluations via waves in viscoelastic/elastic plates and structures. (C) 2018 Elsevier Ltd. All rights reserved.
ISSN号：0020-7683
是否译文：否
发表时间：2018-10-01
合写作者：朱峰,钱征华,Pan, Ernian
通讯作者：钱征华,Pan, Ernian,王彬