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Related Experiment Videos

Acoustic nonlinearities in adhesive joints

Rothenfusser1, Mayr, Baumann

  • 1Infineon Technologies, Munich, Germany. max.rothenfusser@mchp.siemens.de

Ultrasonics
|June 1, 2000
PubMed
Summary

Second harmonic generation (SHG) detects adhesive joint failures. Resonance amplifies strain in soft layers, increasing the second harmonic amplitude, aiding early failure detection.

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Area of Science:

  • Materials Science
  • Non-Destructive Testing
  • Acoustic Materials

Background:

  • Nondestructive testing (NDT) of adhesive joints is crucial for structural integrity.
  • Second harmonic generation (SHG) offers potential for early detection of adhesive layer failures.

Purpose of the Study:

  • To investigate the nonlinear behavior of soft interface layers in adhesive joints.
  • To understand the influence of these nonlinearities on the second harmonic amplitude (A2).

Main Methods:

  • Utilized the finite element method (FEM) to model the nonlinear behavior of the adhesive layer.
  • Conducted experimental measurements to validate the model and analyze the SHG response.

Main Results:

  • Observed that resonance significantly increases strain amplitude in soft interface layers.
  • Demonstrated that the nonlinear behavior of the layer strongly influences the measured second harmonic amplitude (A2).
  • Reported the dependence of calculated and measured effects on layer thickness, sound velocity, and nonlinearity coefficient (beta).

Conclusions:

  • The study confirms the utility of SHG for NDT of adhesive joints.
  • Resonance effects in soft interface layers are key contributors to the SHG signal.
  • FEM modeling provides a valuable tool for predicting SHG response in adhesive joints.

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