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Experimental validation of an inverse method for defect reconstruction in a two-dimensional waveguide model.
J Bulling1, B Jurgelucks2, J Prager1
1Bundesanstalt für Materialforschung und -pruefung, Unter den Eichen 87, 12205 Berlin, Germany.
The Journal of the Acoustical Society of America
|June 12, 2024
Summary
This study introduces a gradient-based algorithm for reconstructing notch defects in steel plates using guided ultrasonic waves. The method accurately determines notch geometry, crucial for non-destructive testing and structural health monitoring.
Area of Science:
- Materials Science
- Mechanical Engineering
- Non-Destructive Testing
Background:
- Defect reconstruction is critical for structural health monitoring (SHM) and non-destructive testing (NDT).
- Guided ultrasonic waves offer a promising technique for inspecting large structures.
- Accurate characterization of defects like notches is essential for assessing structural integrity.
Purpose of the Study:
- To develop and validate an algorithm for reconstructing the geometry of notches in steel plates.
- To compare experimental measurements with simulation data for defect characterization.
- To advance NDT techniques for improved structural health monitoring.
Main Methods:
- A gradient-based reconstruction algorithm utilizing algorithmic differentiation for gradient calculation.
- A simulation model employing the semi-analytical scaled boundary finite element method (SBFEM) for plate cross-section analysis.
- Experimental validation using a scanning laser Doppler vibrometer to record surface velocity fields.
Main Results:
- The algorithm successfully reconstructed the geometrical parameters of parameterized notches.
- Accurate defect geometry reconstruction was demonstrated using two steel plates with notches of varying depths.
- The study confirmed the efficacy of combining SBFEM simulations with experimental data for defect analysis.
Conclusions:
- The presented algorithm enables accurate geometric reconstruction of notches in steel plates.
- This technique significantly contributes to advancements in non-destructive testing and structural health monitoring.
- The findings support the use of guided ultrasonic waves for precise defect characterization in critical structures.
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