FRP積層板の片持曲げ疲労強度に及ぼす高繰返し速度の影響

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The purpose of this study is to investigate how the cyclic frequency of fatigue tests influences the fatigue behavior of fiber reinforced plastics (FRP) under natural convective conditions, especially in a higher cyclic frequency range than those of 1000 or 1800 cpm used in conventional fatigue tests with constant stress. The reduction of rigidity and the raise of surface temperature were observed on the cantilever-type laminated FRP specimens excited sinusoidally by a shaker in a controlled high cyclic frequency of 6000, 8000or 10000 cpm. The time to failure was taken as the time period until the rigidity of a specimen became under 7/8 of its initial value according to the ASTM Standard, D671-63T. Two kinds of FRP were tested : the roving glass cloth reinforced unsaturated polyester resin (R) and the glass-fiber mat, reinforced one (M). The observation of the surface temperature of specimens revealed two patterns in the process of surface temperature increase during fatigue and the cyclic frequency dependency for both FRP laminates. The raise in temperature of specimens M was more remarkable and sensitive for the stress level than that of specimens R. As for the cantilever bending fatigue strength evaluated on the basis of 1/8 rigidity reduction, a considerably large cyclic frequency effect was recognized. The fatigue strength under higher cyclic frequency loading was remarkably lower in comparison with that under the conventional cyclic frequency loading. It was found that fatigue strength σ_f is expressed in the form of λf^<-γ> where λ and γ are constants and f is the cyclic frequency.
社団法人日本材料学会の論文
1979-12-15

FRP積層板の片持曲げ疲労強度に及ぼす高繰返し速度の影響

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