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Guided wave mode selection for inhomogeneous elastic waveguides using frequency domain finite element approach
Vamshi Krishna Chillara1, Baiyang Ren1, Cliff J Lissenden1
1Department of Engineering Science and Mechanics, The Pennsylvania State University, 16802 PA, United States.
Ultrasonics
|January 10, 2016
Summary
This study introduces the frequency domain finite element (FDFE) method for selecting guided wave modes in complex waveguides. The technique aids in identifying sensitive modes for composite defect inspection, offering parameter recommendations for accuracy.
Area of Science:
- Engineering
- Materials Science
- Applied Physics
Background:
- Guided wave testing is crucial for non-destructive evaluation of composite materials.
- Selecting appropriate wave modes is essential for effective defect detection.
- Inhomogeneous waveguides present challenges for traditional mode analysis.
Purpose of the Study:
- To demonstrate the application of the frequency domain finite element (FDFE) technique for guided wave mode selection.
- To analyze mode excitation in homogeneous plates and inhomogeneous waveguides.
- To showcase guided wave mode selection for inspecting disbonds in composites.
Main Methods:
- Utilized the frequency domain finite element (FDFE) technique.
- Studied Rayleigh-Lamb and Shear-Horizontal mode excitation in plates.
- Analyzed two cases of inhomogeneous waveguides using FDFE.
- Investigated the impact of spatial discretization and FFT domain length on accuracy.
Main Results:
- Successfully demonstrated guided wave mode selection for composite disbond inspection.
- Identified wave modes sensitive and insensitive to specific defects.
- Showcased the influence of discretization parameters on FDFE accuracy.
- Provided recommendations for optimal parameter selection.
Conclusions:
- The FDFE technique is effective for guided wave mode selection in complex structures.
- Mode selection is critical for sensitive and reliable defect detection in composites.
- Careful consideration of discretization parameters is necessary for accurate FDFE analysis.
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