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Updated: Jan 23, 2026
09:21
Experiments on Ultrasonic Lubrication Using a Piezoelectrically-assisted Tribometer and Optical Profilometer
Published on: September 28, 2015
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Validating sideband peak count-index (SPC-I) technique as a hybrid linear/nonlinear ultrasonic technique through
Guangdong Zhang1, Meng Wang2, Othmane Achouham3
1Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, AZ 85721, USA.
Ultrasonics
|January 21, 2026
Summary
The sideband peak count-index (SPC-I) technique effectively detects material nonlinearity. This study provides guidelines for using SPC-I in structural health monitoring, confirming its ability to identify nonlinear responses in materials and structures.
Area of Science:
- Materials Science
- Mechanical Engineering
- Non-destructive Testing
Background:
- The sideband peak count-index (SPC-I) is a common method for assessing material nonlinearity.
- Distinguishing between linear scattering and true nonlinear responses using SPC-I remains a challenge for researchers.
Purpose of the Study:
- To investigate the sensitivity of SPC-I to variations in material nonlinearity.
- To establish clear guidelines for setting threshold lines in SPC-I analysis for separate or combined linear and nonlinear detection.
- To validate SPC-I's capability in material characterization and structural health monitoring.
Main Methods:
- Numerical simulations using Murnaghan material models for isotropic nonlinear elastic and elastoplastic plates.
- Excitation of linear and nonlinear plates at varying amplitudes to calculate the amplification factor (AF).
- Experimental validation on aluminum and carbon fiber composite plates, and application to a bolt-loosening structural health monitoring problem.
Main Results:
- SPC-I remained constant for linear materials but varied for nonlinear materials across different AF values.
- Numerical and experimental results confirmed SPC-I's ability to capture nonlinear responses.
- SPC-I demonstrated effectiveness in monitoring bolt-loosening, showing similar trends to resonance frequency shifts but with easier implementation.
Conclusions:
- SPC-I is a reliable technique for assessing material nonlinearity and is sensitive to changes in material behavior.
- The study provides practical guidelines for optimizing SPC-I implementation in detecting linear and nonlinear phenomena.
- SPC-I offers a valuable and accessible tool for material characterization, damage detection, and structural health monitoring applications.
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