Relative Measurement of Acoustic Nonlinear Parameters and Comparison of Sensitivity to Thermal Aging

Title
Relative Measurement of Acoustic Nonlinear Parameters and Comparison of Sensitivity to Thermal Aging
Authors
장경영
Issue Date
2015-04
Publisher
AIP
Citation
AIP Conf. Proc. 1650, (2015), Page. 879-882
Abstract
The acoustic nonlinearity measurement of ultrasonic waves are being extensively researched as a promising nondestructive evaluation element. In the condition of constant propagation distance and wave number, many researchers have measured the second-order relative acoustic nonlinear parameter, β′, that can be simply defined as the ratio of the amplitude of the second harmonic frequency component to the amplitude squared of the fundamental frequency component and compared them in order to identify the acoustic nonlinearity variation according to material degradation. In this study, we extended this concept to the third-order relative acoustic nonlinear parameter, γ′, by defining it as the ratio of the amplitude of the third harmonic frequency component to the amplitude cubed of the fundamental frequency component. To investigate its effectiveness as a nondestructive evaluation element for the material property degradation, both the second-order acoustic relative nonlinear parameter and the third-order relative acoustic nonlinear parameter were measured for the aluminum specimens processed by heat treatment for the different times and then contrasted each other. From the experimental results, the third-order acoustic relative nonlinear parameter was more sensitive than the second-order relative acoustic nonlinear parameter that has been widely used although the amplitude of the third harmonic frequency component was lower than the amplitude of the second harmonic frequency component.
URI
http://scitation.aip.org/content/aip/proceeding/aipcp/10.1063/1.4914692http://hdl.handle.net/20.500.11754/24306
DOI
http://dx.doi.org/10.1063/1.4914692
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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