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Type: Journal article
Title: Analytical and finite element prediction of Lamb wave scattering at delaminations in quasi-isotropic composite laminates
Author: Ng, C.T.
Veidt, M.
Rose, L.
Wang, C.
Citation: Journal of Sound and Vibration, 2012; 331(22):4870-4883
Publisher: Academic Press Ltd Elsevier Science Ltd
Issue Date: 2012
ISSN: 0022-460X
Statement of
C.T. Ng, M. Veidt, L.R.F. Rose, C.H. Wang
Abstract: This paper presents a theoretical and finite element (FE) investigation of the scattering characteristics of the fundamental anti-symmetric (A0) Lamb wave at delaminations in a quasi-isotropic (QI) composite laminate. Analytical models based on the Mindlin plate theory and Born approximation are presented to predict the A0 Lamb wave scattering at a delamination, which is modelled as an inhomogeneity, in an equivalent isotropic model of the QI composite laminate. The results are compared with FE predictions, in which the delamination is modelled as a volume split. The equivalent isotropic model and QI composite laminate are used to investigate the feasibility of the common theoretical approach of modelling the delamination as the inhomogeneity. A good correlation is observed between the theoretical solutions and FE results in the forward scattering amplitudes, but there exists a larger discrepancy in the backward scattering amplitudes. The FE results also show that the fibre direction of the outer laminae has a pronounced influence on the forward and backward scattering amplitudes, which is not predicted by the analytical models.
Rights: Copyright © 2012 Elsevier Ltd. All rights reserved.
RMID: 0020121699
DOI: 10.1016/j.jsv.2012.06.002
Appears in Collections:Civil and Environmental Engineering publications

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