プログラム回転曲げ疲労における強度と変形

概要

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The manifold program loading tests repeated in five stress levels including those in plastic range were carrid out, of S35C, steel by rotating bending at the frequency 20 rpm at the large stress range and 1790 rpm in the ordinary fatigue tests range. In this fatigue test Kawamoto's rotating beam bending fatigue testing machine was used, which was on uniform moment type, and the specimen could be bend in any direction. During the fatigue tests the change of deflexion from vertical to horizontal and vice versa at the center of the specimen was observed. The main conclusion is as follows. (1) The general theory that fatigue fracture occurs at Σn/N is very small. (2) the ratio of the horizontal and the vertical deflexion of the specimen δ_n/δ_v is nearly 1 under large stress loading. (3) The loading under stress will make damage on the fatigue life under the program loading.
社団法人日本材料学会の論文
1968-02-15