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Thermosonic Chladni figures for defect-selective imaging.

Igor Solodov1, Daria Derusova2, Markus Rahammer1

  • 1University of Stuttgart, Institute of Polymer Technology (IKT), 70569 Stuttgart, Germany.

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|March 17, 2015
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Summary

Thermosonic Chladni figures reveal defect patterns by visualizing vibration energy dissipation. This new method, based on a hysteretic damping model, offers a clearer understanding of material defects under resonant vibrations.

Keywords:
Defect-selective imagingThermosonic NDTUltrasonic heat generation

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Area of Science:

  • Materials Science
  • Non-Destructive Testing
  • Acoustics

Background:

  • Conventional Chladni figures visualize vibration modes but offer limited defect characterization.
  • Understanding energy dissipation in materials is crucial for defect detection.

Purpose of the Study:

  • To experimentally observe and analyze thermosonic patterns from defects.
  • To compare thermosonic patterns with conventional Chladni figures.
  • To interpret thermosonic patterns using a hysteretic damping model.

Main Methods:

  • Experimental observation of thermosonic patterns from simulated and realistic defects.
  • Comparison with conventional Chladni figures.
  • Analysis using a hysteretic damping model accounting for in-plane polarization.

Main Results:

  • Thermosonic Chladni figures represent vibration energy dissipation patterns.
  • Patterns are determined by the square of in-plane strain during resonant vibrations.
  • Differences in nodal patterns arise from material extension-compression near boundaries.

Conclusions:

  • Thermosonic imaging provides a novel approach to visualizing material defects.
  • The hysteretic damping model accurately explains observed thermosonic patterns.
  • Superposition of resonance modes enables comprehensive defect imaging.