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Damage identification in multi-step waveguides using Lamb waves and scattering coefficients

Ghadami, A ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1007/s00419-018-1355-0
  3. Publisher: Springer Verlag , 2018
  4. Abstract:
  5. Damage detection in uniform structures has been studied in numerous previous researches. However, damage detection in non-uniform structures is less studied. In this paper, a damage detection algorithm for identifying rectangular notch parameters in a stepped waveguide using Lamb waves is presented. The proposed algorithm is based on mode conversion and scattering phenomena because of interaction of Lamb wave modes with defects. The analysis is divided into two steps: notch localization and notch geometry detection. The main advantage of this method is its ability to detect all of the notch parameters in a waveguide with arbitrary number of step discontinuities. The method is applied to a numerical example and the results show that it can successfully identify the notch location, depth, and width in a multi-step plate. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature
  6. Keywords:
  7. Damage identification ; Lamb waves ; Mode conversion ; Non-uniform waveguide ; Scattering coefficient ; Numerical methods ; Surface waves ; Ultrasonic waves ; Waveguides ; Detection algorithm ; Mode conversions ; Non-uniform ; Rectangular notches ; Scattering phenomenon ; Step discontinuity ; Damage detection
  8. Source: Archive of Applied Mechanics ; Volume 88, Issue 6 , June , 2018 , Pages 1009-1026 ; 09391533 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s00419-018-1355-0