ランダム荷重下におけるガラス繊維強化プラスチックの疲労寿命に関する研究

概要

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Investigations were made on the fatigue properties of satin woven glass cloth FRP with special phases on the effects of input wave type and programmed stress pattern. Fatigue tests were conducted under both the constant stress and the programmed block type variable amplitudes by a hydraulic fatigue testing machine. It is well known that a Gaussian narrow band random process has a probability density distribution of peak amplitudes that is close to Rayleigh distribution. Therefore, an amplitude-time relationship in the actual program load was determined in such a way that the envelope of peak amplitude of the sinusoidal excitation has a probability density function of Reyleigh distribution. The test results showed that the effects of input wave type (sinusoidal, triangular and pulse) and stress pattern (High-Low, Low-High, Low-High-Low, Random) could be explained fairly well some extent with the aid of R. M. S. peak stress value. Furthermore, in clarifying the fatigue properties of the material under service loads, the effect peak stress of low frequency would be one of the interesting subjects which must be dealt with. Hence, the associated investigation was incorporated in the present study.
社団法人日本材料学会の論文
1981-11-15