Effects of test temperature and hardener on the tensile fracture behavior of center-notched CFRP.

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  • 硬化剤を変えたＣＦＲＰ切欠試験片の引張破壊挙動に及ぼす試験温度の影響
  • コウカザイ オ カエタ CFRP キリカキ シケンヘン ノ ヒッパリ ハカイ

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Abstract

The effect of hardener on the tensile fracture behavior of carbon fiber-reinforced plastic, CFRP, in which the pitch-type carbon fiber was combined in an epoxy resin matrix with a fiber content of 50 % by weight, was investigated using smooth and notched tensile specimens in a temperature range from 208 K to 413 K. The hardeners used were an acid anhydride and an amine line. Experimental results were discussed in terms of linear notch mechanics. The tensile strength and the fracture morphology of center-notched CFRP plates strongly depend on the test temperature. The brittleductile transition temperature is slightly affected by the notch tip radius, ρ, regardless of hardeners. In the case of the brittle fracture mode, the CFRP fails under the constant critical elastic maximum stress, σmax c, which is determined by ρ alone. In the case of the ductile fracture mode, the fracture occurs under the condition of constant nominal stress in the net section which is independent of ρ.σmax c was lower by about 15 % for an acid anhydride hardener than for an amine line. Furthermore, the transition temperature was lower by about 37 K for the former than for the latter.

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