Evaluation of Fatigue Strength of Short Carbon Fiber Reinforced Thermo Plastics by Monitoring Temperature Rise in Fatigue Process.

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  • 温度変化に注目したＣＦＲＴＰの疲労寿命評価
  • オンド ヘンカ ニ チュウモク シタ CFRTP ノ ヒロウ ジュミョウ ヒョウカ

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Short carbon fiber reinforced thermo plastics (SCFRTP) fabricated with injection molding generally shows a large amount of scatter in fatigue strength. To find appropriate method of treating this scatter, fatigue tests were carried out. As the results, the scatter in fatigue strengh was estimated in terms of the initial volumetric Young's modulus, which involves the effect of the fiber morphologies such as length distribution and orientation. Parallel to this, the heat generation during fatigue testing was measured on each specimen with different fiber morphologies. The results showed that monitoring terperature rise in specimen is a suitable way to evaluate the fatigue strength of SCFRTP. The validity of this method was demonstrated by fatigue tests with variable stress amplitude ad frequency.

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