温度変化に伴うナイロン系CFRTPの破壊機構とAE特性

概要

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The temperature dependence of fracture mechanisms on two typical structures, a short-fiber-reinforced material and a chopped-strand material with a thermoplastic matrix, were examined by AE monitoring and SEM. It was found that the matrix became brittle as the testing temperature decreased from 60℃ to -20℃, and this gave rise to different fracture behaviors of the materials used. In a short-carbon-fiber-reinforced material, matrix cracking and fiber breakage were the main fracture forms at -20℃ and 0℃, whereas pull-out became the main form at 20℃ and 60℃. In a chopped-strand-reinforced material, cracking between chopped tapes and debonding of fiber/matrix in a chopped tape became marked with increasing testing temperature. In particular, at 60℃, the matrix became more ductile and this resulted in decreased interfacial strength, then pull-out of fiber strands and chopped tapes occurred
1994-11-25