Techno Press
Techno Press

Structural Monitoring and Maintenance   Volume 2, Number 3, September 2015, pages 213-236
DOI: http://dx.doi.org/10.12989/smm.2015.2.3.213
 
Mode conversion and scattering analysis of guided waves at delaminations in laminated composite beams
Reza Soleimanpour and Ching-Tai Ng

 
Abstract     [Full Text]
    The paper presents an investigation into the mode conversion and scattering characteristics of guided waves at delaminations in laminated composite beams. A three-dimensional (3D) finite element (FE) model, which is experimentally verified using data measured by 3D scanning laser vibrometer, is used in the investigation. The study consists of two parts. The first part investigates the excitability of the fundamental anti-symmetric mode (A0) of guided wave in laminated composite beams. It is found that there are some unique phenomena, which do not exist for guided waves in plate structures, make the analysis become more complicated. The phenomena are observed in numerical study using 3D FE simulations. In the second part, several delaminated composite beams are studied numerically to investigate the mode conversion and scattering characteristics of the A0 guided wave at delaminations. Different sizes, locations and through-thickness locations of the delaminations are investigated in detail. The mode conversion and scattering phenomena of guided waves at the delaminations are studied by calculating reflection and transmission coefficients. The results show that the sizes, locations and through-thickness locations of the delaminations have significant effects on the scattering characteristics of guided waves at the delaminations. The results of this research would provide better understanding of guided waves propagation and scattering at the delaminations in the laminated composite beams, and improve the performance of guided wave damage detection methods.
 
Key Words
    laminated composite beam; finite element; delamination; guided waves; mode conversion; scattering; laser vibrometer
 
Address
Reza Soleimanpour and Ching-Tai Ng, School of Civil, Environmental and Mining Engineering, The University of Adelaide, SA 5005, Australia
 

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