各種CFRPの高温3点曲げショートビーム法強度とその破壊モード(<小特集>高分子系複合材料)

概要

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The strength by a short beam method of three point bending was measured forsome CFRPs with varying fiber and matrix resin combination and their failure states were examined. The strength of every CFRP decreased linearly with in creasing temperature. The strength retemtion at 200℃ depended on the glass transition temperature of matrix resin, There tention for PMR-15matrix resin was the highest, followed by MY720 resin and then EPIKOTE 828 resin. The failqre mode of CFRP with EPIKOTE 828 matrix resin tested at a cross head speed of 5 mm/min was a mixture of shear and compression failure below 150℃, but pure shear failure at 200℃. Pure shear failure was also observed at cross head speeds less than 0.5 mm/min, While compression failure in addition to shear failure was observed at cross head speeds more than 5. Omm/min. In CFRP with MY720 matrix resin, only shear failqre was observed in the range of testing temperatures. In CFRP with PMR-15matrixresin, buck1ing failure in addition to shear failure was observed up to 250℃. These differences infailuremodes of different CFRP s werere lated with the ultimate strain of the matrix resin.
社団法人日本材料学会の論文
1991-03-15