実働荷重下の金属の疲労強度 : 平均応力が正弦波状および階段状に変化する場合

概要

論文の詳細を見る
Bending fatigue tests of metals were carried out under two kinds of complex stress patterns; the one was the two superimposed sinusoidal cyclic loadings, and the other the rectangular cyclic loading superimposed with sinusoidal ones. The former loadings were applied with a Schenk type fatigue test machine, and the latter with a electro-magnetic moving coil actuater. The materials used were carbon steel (S35C) and alminum alloy. Those test results showed that if the secondary stress amplitudes (fast ones) were comparatively large and n_0 (total number of secondary ones in a period of primary one) was smaller, the fatigue life of experimental results agrees with the calculated values which are estimated with the authors' formula and the peak pair counting method. It was also shown that if the secondary stress amplitudes were small and n_0 was large, the test life came out longer than the calculated values, and approached the values which were determined only by the maximum amplitude. Only for alminum alloy with two superimposed sinusoidal cyclic loading, the test life proved shorter than that which was determined only by the maximum amplitude, as far as n_0 was small (about 4) and the secondary stress amplitude smaller.
社団法人日本材料学会の論文
1968-02-15