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A method to estimate the absolute ultrasonic nonlinearity parameter from relative measurements
Jongbeom Kim1, Dong-Gi Song1, Kyung-Young Jhang2
1Department of Mechanical Convergence Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04736, Republic of Korea.
Ultrasonics
|March 4, 2017
Summary
This study introduces a new method to accurately measure the absolute ultrasonic nonlinearity parameter (β) using a relative parameter. This technique simplifies the quantitative assessment of material degradation, overcoming challenges in measuring small second harmonic amplitudes.
Area of Science:
- Materials Science
- Non-Destructive Testing
- Acoustics
Background:
- The ultrasonic nonlinearity parameter (β) is crucial for assessing material degradation.
- Measuring the absolute β is challenging due to the small amplitude of the second harmonic component.
- Existing methods often rely on relative parameters, limiting quantitative analysis.
Purpose of the Study:
- To develop a novel method for estimating the absolute ultrasonic nonlinearity parameter (β).
- To enable accurate quantitative assessment of material degradation using ultrasonic measurements.
- To overcome the difficulties associated with directly measuring small second harmonic amplitudes.
Main Methods:
- Proposing a method to estimate the absolute β from a measured relative parameter.
- Utilizing a proportionality constant between normalized absolute and relative parameters.
- Experimental validation using Al6061-T6 alloy specimens with varying heat treatment aging times.
Main Results:
- The proposed method successfully estimates the absolute ultrasonic nonlinearity parameter (β).
- The estimated absolute β values closely matched those measured separately.
- The technique proved effective for Al6061-T6 alloy specimens.
Conclusions:
- The developed method provides a reliable approach to determine the absolute ultrasonic nonlinearity parameter (β).
- This technique facilitates quantitative material degradation assessment in ultrasonic non-destructive testing.
- The findings offer a practical solution for overcoming measurement challenges in ultrasonic nonlinearity analysis.
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