Abstract
In this paper, an experimental study is conducted to accurately measure the absolute nonlinear parameter (?) of damaged solid samples in the pulse-echo setup and the results are presented. Artificially aged Al 6061 specimens are used as the damaged specimen. In order to improve the amplitude of the second harmonic wave received in the pulse-echo mode with the stress-free boundary to a measurable level, we develop a dual element transducer in which the transmitter and receiver are separated. For the measurement of absolute ?, the transfer function is obtained from the calibration experiment of the receiving transducer, and the diffraction and attenuation corrections are taken into account. The results of ? measurement are presented as a function of the aging time, and the change of ? are found to well represent the change in the microstructure of the material due to the change of precipitate.
How to Cite:
Jeong, H. ., Cho, S. ., Shin, H. ., Zhang, S. . & Li, X. ., (2019) “Evaluation of acoustic nonlinearity of heat-treated specimens using a pulse-echo method”, Review of Progress in Quantitative Nondestructive Evaluation .
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