S25C焼なまし材およびポリカーボネートの疲労強度に及ぼす表面粗さの影響

概要

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In order to investigate the effect of surface roughness on the fatigue strength, push-pull type fatigue tests were performed using 0.25%C annealed steel and polycarbonate specimens. Specimens with four different surface roughness were examined for both materials. The larger surface roughness gave the lower fatigue strength and the tendency became more remarkable for longer life except near the fatigue limit of carbon steel. This was more remarkable on polycarbonate rather than carbon steel. Good correlation was observed btween the surface roughness R_<max> and the fatigue strength reduction factor RF, which was defined by ratio of the fatigue strength for the specimen with surface roughness to the fatigue strength of the smooth specimen with the smallest surface roughness. This relation was presented by the equations RF=C_1R^m_<max> and m=C_2+C_3 log N_f, where C_1,C_2 and C_3 were material constants and N_f was the fatigue life.
1998-06-25