Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 03, 2023 - September 06, 2023
In this paper, a tensile test of single carbon fiber composites was conducted and AE (Acoustic emissions) by fiber breakage were recorded. Two AE sensors were used for detecting AE waveforms to estimate location of the AE source. The location of fiber breakage was also confirmed by polarized visual observation using a video microscope. From the comparison of AE source location and fiber breakage location, it was found that AE occurred in this specimen caused by fiber breakage. The time-frequency analysis using Wavelet transform showed that the fiber breakage AE had two components: one was AE by fiber breakage in a range of 280-400 kHz and another was AE by pull-out in a range of 700-900kHz. The results also showed that it was difficult to detect the high frequency component of pull-out due to attenuation of wave. As for this specimen, it appeared that most of AE waves by fiber breakage involved pull-out component. The duration time had no correlation with loading strain, however the amplitude had positive correlation because the AE power governed by released strain energy at fiber breakage.
