金属材料の片振りねじり重複繰返し応力による疲れ強さ

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  • Fatigue Strength of Metals under Multiple Repeated Stress of Pulsating Torsion
  • キンゾク ザイリョウ ノ カタブリネジリ チョウフク クリカエシ オウリョク ニ ヨル ツカレ ツヨサ

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The pulsating multiple repeated stress in this paper means a pulsating stress that changes its direction with some intervals periodically. The investigation about the fatigue strength when materials subject to such pulsating stress has not been reported so far. In this report, experiments was made on the fatigue strength when above-mentioned torsional stress was applied to the specimen of 0.34% carbon steel, and the results was compared with the fatigue strength under ordinary pulsating torsional stress in which the direction did not change. In conclusion, the difference between the fatigue life under such pulsating stress and that under ordinary one was hardly observed, while the endurance limit for the former stress was brought slightly down from that for the latter stress, because of the change of stress direction. In addition, some considerations were made on the behaviour of fatigue deformation or fatigue creep during the tests both under such pulsating stress and the ordinary one.

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