Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 62, Issue 16, Pages 2169-2177Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0266-3538(02)00147-1
Keywords
fiber/matrix; interfacial strength; aramid fiber; acoustic emission; pull-out test
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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 time in deionized water at 80 degreesC, and thereafter showed a plateau. 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 four types according to fracture modes. AE signals detected at final unstable crack propagation and fiber breakage had high amplitude and long duration. (C) 2002 Elsevier Science Ltd. All rights reserved.
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