The Influence of Notch Shape on Fatigue Reliability for Carbon-Fiber-Reinforced PA46.

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  • 炭素繊維強化ナイロン４６の疲労信頼性に及ぼす切欠形状の影響
  • タンソ センイ キョウカ ナイロン46 ノ ヒロウ シンライセイ ニ オヨボス

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The influence of notch shape on the fatigue reliability of carbon-fiber (CF) -reinforced PA 46 was examined and compared with that of glass-fiber (GF)-reinforced PA 46, CF. PA 66 and GF. PA 66. The main results were as follows : (1) In terms of the fatigue strength of U-notched specimens, CF. PA 46 is markedly superior to the other three materials. On the other hand, the fatigue strength of V-notched specimens was divided into two groups of CF materials and GF materials. Then, this is inferior to that. (2) For U-notched specimens, three stages were observed in the diagram showing the relation between notch root heating ⊿ T and number of cyclic stress N. The temperature of the notch bottom is increased rapidly at the first stage and kept constant during the second stage. Then, crack tip heating is promoted with crack growth at the final stage. On the other hand, for V-notched specimens, the one and only final stage was found in ⊿ T-N diagram. From ⊿ T-N diagram, it could be suggested that the crack initiating in U-notched specimens required a half fatigue life and that the crack propagating in V-notched specimens had a majority in fatigue life. (3) By micro fractography using SEM, it was recognized that the fracture surface of V-notched specimens was brittle and flat, while that of U-notched specimens was ductile and rough. Therefore, it is assumed that fatigue reliability of U notched specimens could be improved at the crack initiating through the superior heat resistance of CF. PA 46 and also the higher rigidity and heat conductivity of carbon fiber.

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