Ultrasonic nonlinearity parameter in uniaxial stress condition

Jongbeom Kim; Chang-Soo Kim; Dong-Gi Song; Kyung-Young Jhang

doi:10.1016/j.ultras.2019.03.013

Ultrasonic nonlinearity parameter in uniaxial stress condition

Ultrasonics. 2020 Mar:102:105914. doi: 10.1016/j.ultras.2019.03.013. Epub 2019 Mar 21.

Authors

Jongbeom Kim¹, Chang-Soo Kim², Dong-Gi Song², Kyung-Young Jhang³

Affiliations

¹ Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea.
² Department of Convergence Mechanical Engineering, Hanyang University, Seoul 04763, Republic of Korea.
³ School of Mechanical Engineering, Hanyang University, Seoul 04763, Republic of Korea. Electronic address: kyjhang@hanyang.ac.kr.

PMID: 31948809
DOI: 10.1016/j.ultras.2019.03.013

Abstract

The ultrasonic nonlinearity parameter derived for one-dimensional propagation of a longitudinal wave in an isotropic material has been considered useful in the evaluation of material degradation. To demonstrate this, many researchers have reported on the correlation with the yield strength obtained from a tensile test. However, there is an essential issue with this procedure - which is that the ultrasonic nonlinearity parameter is derived in a state where the lateral strain is restrained, whereas the tensile test to measure the yield strength is carried out under uniaxial stress conditions, where lateral deformation is free. In this study, to address this issue, the authors have defined the ultrasonic nonlinearity parameter under uniaxial stress conditions which were the same as the tensile test, and showed that the correlation with the yield strength was higher than the currently used ultrasonic nonlinearity parameter. To verify the validity of the proposed ultrasonic nonlinearity parameter, experiments were carried out for Al6061-T6 alloy specimens heat-treated with different aging times. Results showed that the proposed ultrasonic nonlinearity parameter exhibited a much higher correlation with yield strength than the currently used nonlinearity parameter.

Keywords: Acoustoelasticity; Al6061-T6; Piezo-electric detection method; Thermal aging; Ultrasonic nonlinearity parameter; Uniaxial stress condition.