Effect of Superimposed Stress of High Frequency on Fatigue Strength of Annealed Carbon Steel

概要

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The behavior of the fatigue strength of annealed S 45 C carbon steel under composite stress consisting of rotating bending stress and superimposed stress of higher frequency was studied. The ratio of the frequency of superimposed stress to the frequency of rotating bending stress was selected as 11.6. It was observed that, when the ratio of superimposed stress to maximum stress was less than 0.2,the fatigue life was scarcely affected by the superimposed stress, but, when the ratio was more than 0.2,the fatigue life under composite stress was comparatively shorter than that under the stress of constant amplitude. The endurance limit was lowered by superimposing the stress of high frequency. The maximum decrease reached about 35 percent of the endurance limit under the stress of constant amplitude.
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