SM400鋼切欠材の第二ステージ初期疲労破面形態に及ぼす平均応力ならびに切欠き半径の影響

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タイトル別名
  • Effect of Mean Stress and Notch Radius on Fatigue Fractured Surface in the Early Second Stage in Notched SM400 Steel Specimen
  • SM400 コウ キリカキザイ ノ ダイ2ステージ ショキ ヒロウハメン ケイタイ ニ オヨボス ヘイキン オウリョク ナラビニ キリカキ ハンケイ ノ エイキョウ

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The fatigue strength of a specimen with a sharp notch has a tendency to decrease when the mean stress applied to the specimen is increased. To find out some changes of the feature in a fractured surface related to the effect of a mean stress on a fatigue strength, the early second stage of a crack must be observed because the first stage crack can not be affected by the mean stress.<BR>In this report, some changes of the early second stage crack caused by the mean stress in a notched SM400 steel specimen is investigated by using a scanning electron microscopy. The other hand, for the example that there is no effect of a mean stress on a fatigue strength, the fractured surface of the specimen with a large radious notch is additionally observed.<BR>The results obtained are as followed. Under the condition that the stress amplitude is kept at a constant value, the region size of the fractured surface involving with small plane parts is changed by the effect of the mean stress when the mean stress is small. When the mean stress is large, there is no change of the region size. There is no change of the resion size in a specimen with a large radius notch.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 62 (12), 1143-1150, 1998

    公益社団法人 日本金属学会

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