Abstract
This paper presents a study of Lamb wave scattering and mode conversion at a delamination in quasi-isotropic (QI) composite laminates. The study employs the fundamental antisymmetric mode () Lamb wave as the incident wave and investigates the scattered Lamb wave and mode converted fundamental symmetric mode () Lamb wave () at the delamination. A three-dimensional (3D) explicit finite-element (FE) model is proposed to predict the Lamb wave propagation in the QI composite laminates, and scattered wave and mode converted wave at the delamination. An experimental study is also carried out to demonstrate that the 3D FE model is able to provide a reasonable prediction of the and Lamb wave propagation in the QI composite laminates. The results show that the amplitudes of the scattered and mode converted Lamb waves depend on the fiber orientation of the outer laminae, and the size and through-thickness location of the delamination. In summary, the results of this study can further advance the delamination detection techniques using Lamb wave and gain physical insights into the scattering and mode conversion of Lamb wave at the delamination.
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Published In
Journal of Aerospace Engineering
Volume 32 • Issue 5 • September 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Oct 10, 2018
Accepted: Mar 26, 2019
Published online: Jun 6, 2019
Published in print: Sep 1, 2019
Discussion open until: Nov 6, 2019
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