炭素繊維強化PEEKの高温疲労信頼性に及ぼす環境温度の影響 : (メゾき裂からマクロき裂への成長機構について)

概要

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The influence of environmental temperature on fatigue reliability at elevated temperature for carbon-fiber reinforced PEEK was examined. Attention was focussed on the mechanism of growth from mesocracks to macrocracks at elevated temperature. The main results were as follows. (1) The fatigue strength of CF 15 and gf 30 materials decreased with increasing environmental temperature. (2) The influence of stress and environmental temperature on fatigue strength bellow the glass transition temperature was represented by the N_f 1/T diagram and S-T (C+log t_r) diagram. Therefore it was suggested that high-cycle fatigue life was could be estimated from these parameters. (3) It was appeared that the temperature rise in the fatigue damage zone was closely related to the meso crack formation process. (4) It was thought that the difference of mesocrack formation between CF 15 material and gf 30 material was reflected in the difference of the activation energy.
1997-02-25