Proceedings of the
9th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN2022)
15 – 18 November 2022, Singapore

Investigation of Acoustic Emission under Scratch Motion

Jae-Ho Han1, You-jin Min1 and Dae-Eun Kim1,a

1 Department of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seoul, 03722, Republic of Korea


Acoustic emission (AE) testing has been recognized as a well-established method for condition monitoring. Due to high sensitivity of the AE signal, it is possible to predict and diagnose a mechanical failure in the early stage. However, it is difficult to identify which wear phenomenon occurred between the contact surfaces with AE testing results. Also, since AE signals are easily affected by background noises, it is important to study the characteristics of the AE signals that are generated according to the wear mechanisms in developing an accurate AE testing method. In this study, to understand the AE phenomenon according to the wear mechanism, the AE tests on different materials were conducted under scratch motion. For the scratch test, the nano-scratch tester was used. The coating materials were fabricated by customized magnetron sputtering system. The AE signals were obtained by bandwidth type AE sensor attached below the specimen, and background noises were filtered based on the noise signals acquired before the experiment. After the experiments, the AE signals were analyzed in both frequency domain and time domain. The scratch tracks were observed using scanning electron microscope to identify the wear mechanisms. The experiment results demonstrated that the strength and frequency of AE signals changed according to different wear mechanisms. The results of this study will be helpful in designing the condition monitoring technique based on the AE test.

Keywords: Acoustic emission, Scratch test, Wear mechanism, Condition monitoring

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