Influence of stacking sequence on scattering characteristics of the fundamental anti-symmetric Lamb wave at through holes in composite laminates

This paper investigates the scattering characteristics of the fundamental anti-symmetric ( A 0 ) Lamb wave at through holes in composite laminates. Three-dimensional (3D) finite element (FE) simulations and experimental measurements are used to study the physical phenomenon. Unidirectional, bidirect...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2011-03, Vol.129 (3), p.1280-1287
Main Authors: Veidt, Martin, Ng, Ching-Tai
Format: Article
Language:English
Subjects:
Acoustics
Acoustics - instrumentation
Computer Simulation
Epoxy Compounds
Exact sciences and technology
Finite Element Analysis
Fundamental areas of phenomenology (including applications)
Models, Theoretical
Numerical Analysis, Computer-Assisted
Physics
Porosity
Reproducibility of Results
Scattering, Radiation
Structural acoustics and vibration
Time Factors
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Summary:This paper investigates the scattering characteristics of the fundamental anti-symmetric ( A 0 ) Lamb wave at through holes in composite laminates. Three-dimensional (3D) finite element (FE) simulations and experimental measurements are used to study the physical phenomenon. Unidirectional, bidirectional, and quasi-isotropic composite laminates are considered in the study. The influence of different hole diameter to wavelength aspect ratios and different stacking sequences on wave scattering characteristics are investigated. The results show that amplitudes and directivity distribution of the scattered Lamb wave depend on these parameters. In the case of quasi-isotropic composite laminates, the scattering directivity patterns are dominated by the fiber orientation of the outer layers and are quite different for composite laminates with the same number of laminae but different stacking sequence. The study provides improved physical insight into the scattering phenomena at through holes in composite laminates, which is essential to develop, validate, and optimize guided wave damage detection and characterization techniques.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.3533742