期刊
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
卷 18, 期 3, 页码 690-714出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/1475921718765955
关键词
Structural health monitoring; material damping; attenuation; guided wave propagation; composite plates; predictive modeling; piezoelectric wafer active sensors
资金
- National Aeronautics and Space Administration (NASA) [NNL15A A16 C]
- Air Force Office of Scientific Research (AFOSR) [FA9550-16-1-0401]
Guided wave attenuation in composites due to material damping is strong, anisotropic, and cannot be neglected. Material damping is a critical parameter in selection of a particular wave mode for long-range structural health monitoring in composites. In this article, a semi-analytical finite element approach is presented to model guided wave excitation and propagation in damped composite plates. The theoretical framework is formulated using finite element method to describe the material behavior in the thickness direction while assuming analytical expressions in the wave propagation direction along the plate. In the proposed method, the Kelvin-Voigt damping model using a complex frequency-dependent stiffness matrix is utilized to account for anisotropic damping effects of composites. Thus, the existing semi-analytical finite element approach is being extended to include material damping effect. Theoretical predictions are experimentally validated using scanning laser Doppler vibrometer measurements of guided wave propagation generated by a circular piezoelectric wafer active sensor transducer in a unidirectional carbon fiber reinforced polymer composite plate. The proposed method achieves good agreement with the experimental results.
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