切欠きをもつFRPの疲労破損の条件

概要

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Plane bending fatigue tests were carried out on the notched specimens of fiber glass/epoxy laminates for a wide range of notch-root radii and stress amplitudes. Our attention was focussed on the damaged zone near the notch root of specimens. The process of fatigue damage was studied by measuring the luminance at the limited spot near the notch root. Closer observation by means of a scanning electron microscope revealed that the initiation of microcracks at the notch root was accompanied with the decrease of luminance near the notch root. The experiment shows that the number of cycles to failure is determined by both the maximum elastic stress at the notch root and the notch-root radius. On the basis of the concept of severity at the notch root, the experimental results can be clearly elucidated. Applying the fatigue failure criterion derived here, we can make an accurate estimate of the life for notched specimens of FRP.
一般社団法人日本機械学会の論文
1991-10-25