大形軸の曲げ疲れ強さに及ぼす溶接欠陥の影響

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タイトル別名
  • The Influence of the Defects in Welded Metal on Bending Fatigue Strength of Large Shafts
  • オオガタジク ノ マゲ ツカレ ツヨサ ニ オヨボス ヨウセツ ケッカン ノ エイキョウ

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抄録

The authors have carried out rotary bending fatigue tests of the large cylindrical specimens (0.2% carbon steel) having a circumferential groove welded up by manual electric welding and also of the small specimens taken from the welded part of the large ones. Two series of specimens, stress-relieved and not stress-relieved, have been tested in order to investigate the influence of residual stress at the same time. The results are summarized as follows : (1) The fatigue strength of the large and small stress-relieved welded specimens have decreased to 43% and 58% of that of the solid specimens having the respective sizes. Such decrease of fatigue strength may be caused by the defects such as blow holes in welded metal, which may result in the sharp notch effect. (2) The fatigue strength of the large specimens which were not stress-relieve dhas decreased more remarkably, and shown 38% of that of the solid specimens. However, for small specimens, the fatigue strength has not practically shown the effect of stress-relieving.

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