Abstract
The fatigue specimens of plate beams were prepared from celluloid, phenolite and epoxy plates. Effects of the fatigue on mechanical properties of these rigid high polymers under the repeated uniform bending moment were studied by the photo-elastic experiment. The results are as follows : (1) The deformation and the fringe order which appears in the bending fatigue increase with fatigue progress. (2) Te photo-elastic sensitivity increases by the effect of fatigue. And this behaviour of fatigue of these materials is more remarkable under the compressive stress than under the tensile stress. (3) The notch has also great effect on the fatigue. (4) The top of the crack which undergoes the repeated stress is of a trapezoid form. (5) Celluloid of which the plastic flow is remarkable is superior to others on the fatigue.
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