CHARACTERIZATION BY MICROMECHANICAL APPROACHES OF FIBER/MATRIX INTERFACIAL PROPERTIES IN C FIBER AND POLYMER MATRIX COMPOSITES
Résumé
In the present work, the interfacial properties between two carbon fibers, with different surface roughness, and PEEK were studied using multifragmentation tests with model single-fiber composites. Acoustic emission instrumentation was used to detect and locate fiber breaks in the specimen. This method was validated by microscopy observations. Moreover, acoustic emission data showed that the two studied fibers have a different dependency on strain for fiber fragmentation. In situ, X-ray tomography fragmentation tests provided information on fiber fragmentation and matrix behavior in the zone near a fiber break. Interfacial shear strength for both systems studied was estimated, showing a limited effect of the fiber's roughness. Fiber fragment lengths measured by microscopy, acoustic emission, and tomography techniques demonstrated good agreement
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