AE法による曲げ疲労を与えたチョップドストランド形CFRPの破壊機構の解明

概要

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The fracture mechanisms in the bending process of a chopped-strand-type CFRP with different degrees of bending fatigue damage are examined and compared with those of the virgin specimen. Observation using SAM and SEM has also been conducted. It is confirmed that the fatigue damage has a distinctive influence on AE events before the initiation of macrocracking. As the degree of fatigue damage increases the events with amplitude from 240μV to 560μV due to debonding between the matrix and fiber increase and the events with amplitude from 600μV to 720μV mainly due to fibers breaking decrease. The characteristic differences in the three-dimensional diagram of power spectrum-frequency-load between the virgin specimen and the fatigued one are described. Distinctive features before and after the macrocracking in the bending fracture process for both the virgin specimen and the fatigued one are also recognized.
一般社団法人日本機械学会の論文
1993-09-25