定荷重繊維引抜き試験における繊維応力分布の時間変化のラマン分光による評価(<小特集>:非弾性挙動の力学)

概要

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The time-dependent change of stress profiles resulting from matrix viscosity in unidirectional fibrous composites was studied using Raman spectroscopy, which enables us to determine fiber stress on the basis of the stress dependence of Raman band peak positions. Three kinds of model composites, in which single carbon fibers were embedded in three different resins, were tested by pulling the fibers at constant stresses for 500 to 1000 hours. The resins were normal epoxy, flexible epoxy and uv-curable acrylic. It was observed that a carbon fiber/normal epoxy composite exhibited negligible increase of stress transfer length with time whereas flexible epoxy and uv-curable acrylic allowed, respectively, considerable and significant changes of fiber stress profiles with time. These observations were shown to be consistent with the creep and stress relaxation test results of the matrix materials. It was however found that the time-dependent change of fiber stress profiles was much slower in the experiments than in the prediction based perfect bonding at fiber/matrix interface. It was then shown that the sliding at fiber/matrix interface, which was responsible for the slow change of fiber stress profiles, ocurred in the model composites tested.
社団法人日本機械学会の論文
2000-03-25