Abstract
On cutting the model uni-directional glass fiber reinforced plastic (GFRP) materials, the cut surfaces are classified into two modes by relation between the direction of yarn and the cutting direction. One is the hollow caused by the over-cut fibers, the other is the fuzzing caused by the uncut fibers. It was found with scanning electron microscope observation that the hollows of cut surfaces are caused by the bending fracture of fibers. Therefore the over-cut phenomenon of fibers was analyzed with the beam bending theory. This analysis was conducted as a problem of the cantilever beam acting the distributed load on elastic foundation. From this analysis, the position of maximum bending moment would occur deeper parts of the cut surfaces. The results of this analysis showed a good agreement with that of the experiments.
