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Smart Structures and Systems Volume 26, Number 2, August 2020 , pages 157-174 DOI: https://doi.org/10.12989/sss.2020.26.2.157 |
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Guided wave field calculation in anisotropic layered structures using normal mode expansion method |
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Lingfang Li, Hanfei Mei, Mohammad Faisal Haider, Dimitris Rizos, Yong Xia and Victor Giurgiutiu
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| Abstract | ||
| The guided wave technique is commonly used in structural health monitoring as the guided waves can propagate far in the structures without much energy loss. The guided waves are conventionally generated by the surface-mounted piezoelectric wafer active sensor (PWAS). However, there is still lack of understanding of the wave propagation in layered structures, especially in structures made of anisotropic materials such as carbon fiber reinforced polymer (CFRP) composites. In this paper, the Rayleigh-Lamb wave strain tuning curves in a PWAS-mounted unidirectional CFRP plate are analytically derived using the normal mode expansion (NME) method. The excitation frequency spectrum is then multiplied by the tuning curves to calculate the frequency response spectrum. The corresponding time domain responses are obtained through the inverse Fourier transform. The theoretical calculations are validated through finite element analysis and an experimental study. The PWAS responses under the free, debonded and bonded CFRP conditions are investigated and compared. The results demonstrate that the amplitude and travelling time of wave packet can be used to evaluate the CFRP bonding conditions. The method can work on a baseline-free manner. | ||
| Key Words | ||
| guided waves; anisotropic; layered plate; piezoelectric wafer active sensor; normal mode expansion; debonding | ||
| Address | ||
| (1) Lingfang Li, Yong Xia: Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong; (2) Hanfei Mei, Victor Giurgiutiu: Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, USA; (3) Mohammad Faisal Haider: Department of Aeronautics and Astronautics, Stanford University, Stanford, CA 94305, USA; (4) Dimitris Rizos: Department of Civil Engineering, University of South Carolina, Columbia, SC 29208, USA. | ||