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Nonlinear mixing of non-collinear guided waves at a contact interface
P Blanloeuil1, L R F Rose2, M Veidt3
1School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
Ultrasonics
|October 23, 2020
Summary
Wave mixing effectively detects damage by generating higher amplitude mixed waves than background nonlinearity. This approach offers flexibility in detecting contact acoustic nonlinearity in cracks and interfaces.
Area of Science:
- Nonlinear acoustics
- Guided wave mechanics
- Damage detection
Background:
- Harmonic generation is limited for damage detection.
- Wave mixing presents practical advantages for identifying distributed and localized damage.
- Contact acoustic nonlinearity at interfaces is a key factor in damage assessment.
Purpose of the Study:
- To develop an analytical model for predicting mixed modes from nonlinear wave mixing.
- To validate the model using finite-element analysis and experimental investigation.
- To assess the potential of wave mixing for detecting contact acoustic nonlinearity.
Main Methods:
- Analytical modeling of nonlinear wave mixing of guided waves.
- Finite-element (FE) analysis with a unilateral contact law (clapping and frictional sliding).
- Experimental investigation of guided wave mixing under varying contact stress and incident amplitude.
Main Results:
- The analytical model accurately predicts mixed mode propagation.
- FE analysis provides insights into optimal interaction angles and load ratio dependence.
- Experimental results confirm higher amplitude mixed waves from interface mixing compared to background nonlinearity.
Conclusions:
- Wave mixing is a flexible and effective method for detecting contact acoustic nonlinearity at defects.
- The approach offers superior mixed-wave amplitude compared to traditional methods.
- Discrepancies between experimental and FE results suggest the influence of surface roughness.
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