Analysis of the Influence of Surface Roughness on Measurement of Ultrasonic Nonlinearity Parameter Using Contact-Type Transducer

The ultrasonic nonlinearity parameter is used to evaluate the nonlinear elasticity of a material, which is determined from the displacement amplitude of the fundamental and second-order frequencies components in an ultrasonic wave propagating through a material. However, the displacement amplitude o...

Full description

Saved in:
Bibliographic Details
Published inApplied sciences Vol. 10; no. 23; p. 8661
Main Authors Kim, Jongbeom, Ha, Hong-Pil, Kim, Kyung-Mo, Jhang, Kyung-Young
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.12.2020
Subjects
absolute nonlinear measurement
Amplitudes
Calibration
Measurement techniques
Nonlinearity
relative nonlinear measurement
Stainless steel
Surface roughness
ultrasonic nonlinearity parameter
Ultrasonic transducers
Wave propagation
Online AccessGet full text

Cover

More Information
Summary:The ultrasonic nonlinearity parameter is used to evaluate the nonlinear elasticity of a material, which is determined from the displacement amplitude of the fundamental and second-order frequencies components in an ultrasonic wave propagating through a material. However, the displacement amplitude of the second-order harmonic component generated during propagation through a material is very weak because it is easily affected by measurement conditions such as surface roughness. In this study, we analyzed the influence of surface roughness on the measurement of the ultrasonic nonlinearity parameter. For this purpose, Al6061-T6 and SUS304 specimens were prepared with different surface roughness ranging from 0.5 to 2.9 μm. Then, the absolute and relative ultrasonic nonlinearity parameter measurements were conducted using a through-transmission technique involving two cases: both surfaces being rough, and one being a rough surface and the other being a smooth surface. The experimental results showed that the surface roughness had a lesser influence on the absolute measurement than on the relative measurement and that the transmission surface was less affected by the reception surface. These results were similar regardless of the types of specimens. Therefore, to perform accurate measurements, it is desirable to measure the nonlinearity parameter after polishing the material surface.
ISSN:2076-3417
2076-3417
DOI:10.3390/app10238661