9 アラミド単繊維/エポキシ樹脂界面破壊特性に及ぼす水環境効果

概要

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Single fiber pull-out tests were carried out to investigate the influence of water absorption on the interfacial properties of aramid*epoxy composite. The fiber/matrix interfacial strength was severely decreased between 4 and 7 week immersion in deionized water at 80℃, and thereafter showed the alateau. This change with immersion time did not correspond with that of the water gain of the pull-out specimens, because the water gain did not reflect the one in the fiber/matrix interface. As a result of the degradation of the fiber/matrix interfacial strength, the pulled-out fiber surfaces of 7,10 and 13 week wet specimen were smooth. In situ observations of interfacial crack propagation by a video microscope and an analysis of acoustic emission (AE) signals showed that AE signals obtained during the pull-out process were classified into 4 types according to fracture modes. AE signals detected at final unstable crack propagation and fiber breakage had high amplitude and long duration.
2002-08-06