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Defect reconstruction in a two-dimensional semi-analytical waveguide model via derivative-based optimization.

J Bulling1, B Jurgelucks2, J Prager1

  • 1Bundesanstalt für Materialforschung und -pruefung, Unter den Eichen 87, 12205 Berlin, Germany.

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Summary
This summary is machine-generated.

This study reconstructs defects in 2D waveguides using ultrasonic inspection and derivative-based optimization. The method accurately identifies cracks, delamination, and corrosion, even with noisy data.

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Area of Science:

  • Engineering
  • Materials Science
  • Computational Mechanics

Background:

  • Non-destructive ultrasonic inspection is crucial for material integrity assessment.
  • Accurate defect reconstruction in waveguide models is challenging.

Purpose of the Study:

  • To develop and validate an indirect measurement approach for defect reconstruction in 2D waveguide models.
  • To assess the efficiency and robustness of the proposed method for various defect types.

Main Methods:

  • Simulating mechanical wave propagation using the scaled boundary finite element method (SBFEM).
  • Employing an iteratively regularized Gauss-Newton method with algorithmic differentiation for optimization.
  • Fitting simulated reflected wave data to experimental data for defect parameterization.

Main Results:

  • Successfully reconstructed three types of defects: cracks, delamination, and corrosion.
  • Demonstrated efficient and robust defect parameterization even in the presence of noise.
  • Validated the accuracy and efficiency of the derivative-based optimization approach.

Conclusions:

  • The indirect measurement approach is effective for non-destructive ultrasonic inspection of waveguide defects.
  • The combination of SBFEM and derivative-based optimization provides accurate and robust defect reconstruction.
  • The method shows promise for real-world applications in material health monitoring.