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Guided wave skew velocity correction in anisotropic laminates
Ultrasonics
|May 30, 2023
Summary
Damage detection in anisotropic structures using guided ultrasonic waves is improved by correcting for wave skewing effects. This study quanties velocity changes in carbon fiber laminates, enhancing accuracy for structural health monitoring.
Area of Science:
- Materials Science
- Mechanical Engineering
- Non-Destructive Testing
Background:
- Anisotropic materials, like carbon fiber laminates, exhibit directional wave propagation.
- Guided ultrasonic waves are sensitive to material properties and damage.
- Wave skewing effects in anisotropic media complicate velocity measurements and damage localization.
Purpose of the Study:
- To investigate the phase and group velocities of the A0 guided wave mode in unidirectional carbon fiber reinforced laminates.
- To experimentally and computationally analyze the impact of wave skewing on velocity measurements.
- To develop and illustrate a correction method for wave skewing effects to improve damage detection accuracy.
Main Methods:
- Experimental modal analysis using guided ultrasonic waves.
- Finite element analysis (FEA) of wave propagation.
- Development and application of a velocity correction method for wave skewing.
Main Results:
- Phase and group velocities of the A0 mode were measured and simulated in carbon fiber laminates.
- Significant velocity offsets due to wave skewing were quantified for point and line sources.
- The proposed correction method achieved good agreement with theoretical predictions.
Conclusions:
- Wave skewing significantly affects guided wave velocity measurements in anisotropic composites.
- A correction method for wave skewing improves the accuracy of velocity calculations.
- Accurate velocity characterization is crucial for reliable damage detection in composite structures.
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