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New nonlinear ultrasonic method for material characterization: Codirectional shear horizontal guided wave mixing in

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  • 1Department of Engineering Science and Mechanics, Penn State, State College, PA 16802, USA; Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong.

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This study introduces a new nonlinear ultrasonic method using wave triplets to detect early fatigue damage in materials. The technique shows high sensitivity for material characterization and damage detection.

Keywords:
Codirectional wave mixingLamb wavesMaterial characterizationShear-horizontal waves

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Area of Science:

  • Materials Science
  • Nonlinear Acoustics
  • Ultrasonic Testing

Background:

  • Weakly nonlinear plates can generate sum-frequency waves.
  • Lamb waves are crucial for material characterization and defect detection.
  • Understanding nonlinear wave interactions is key to advanced ultrasonic methods.

Purpose of the Study:

  • To propose a novel nonlinear ultrasonic method for material characterization.
  • To investigate the generation of sum-frequency S0 Lamb waves from codirectional shear-horizontal SH0 waves.
  • To demonstrate the method's sensitivity to early fatigue damage.

Main Methods:

  • Theoretical analysis of wave triplet interactions in nonlinear plates.
  • Finite element simulations using a subtraction method for nonlinear feature extraction.
  • Experimental validation with a gel filter to isolate nonlinear signals.

Main Results:

  • Discovery of internally resonant secondary S0 Lamb waves at sum frequencies.
  • Confirmation of the cumulative effect of generated S0 Lamb waves.
  • Demonstration of high sensitivity to early fatigue damage in materials.

Conclusions:

  • The proposed nonlinear ultrasonic method is effective for material characterization.
  • The method shows significant promise for early fatigue damage detection.
  • Optimizing frequency combinations enhances nonlinear Lamb wave generation efficiency.