平織布ＣＦＲＰの疲労特性に及ぼす繊維方位の影響

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  • Effect of Anisotropy on Fatigue Properties of Notched CFRP Laminates.
  • ヒラオリヌノ CFRP ノ ヒロウ トクセイ ニ オヨボス センイ ホウイ ノ

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The effect of anisotropy on fatigue properties of notched carbon fiber reinforced plastic laminates has been studied. The off-axis angle of carbon fiber was varied from 0° to 45°. The ultimate tensile strength and the tensile elastic modulus drastically decreased when increasing the off-axis angle of carbon fiber to 30°. When the off-axis angle of carbon fiber increased over 30°, these values approached approximately constant values. The maximum tensile strain also increased and saturated to a constant value when the off-axis angle of the carbon fiber increased. The fatigue strength of notched CFRP laminates showed a similar dependence of ultimate tensile strength on the off-axis angle. The decrease of fatigue strength results from the fatigue damage in relation to the off-axis angle. The fatigue damage process was analyzed in terms of AE measurement and fractography. These results indicate that the fatigue damage process of CFRP laminates was significantly affected by the off-axis angle of carbon fiber.

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