負の応力比下でのＳＭ５０Ａ鋼溶接材の疲労き裂伝ぱ挙動

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タイトル別名
  • Fatigue Crack Propagation Behavior of Welded Material SM50A under Negative Stress Ratio Condition.
  • フ ノ オウリョクヒカ デ ノ SM50A コウ ヨウセツザイ ノ ヒロウ

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The crack propagation behavior of welded material SM50A under a negative stress ratio condition was evaluated with the maximum stress intensity factor Kmax and the effective stress intensity factor range ΔKeff. The crack opening stress σop was measured by means of the strain interference method. The crack opening stress σop in the welded metal was lower than that in the base metal due to the tensile residual stress. Also, the negative value of the crack opening stress σop was measured in the case of the welded metal. Therefore, the relation between Kmax and the crack propagation rate da/dN was found to be different between the welded metal and the base metal. However, the relationship between ΔKeff and da/dN could be evaluated with the same equation in all the present experimental cases. Thus, it is confirmed that ΔKeff is one of the reasonable parameters for the evaluation of fatigue crack propagation and the strain interference method is useful for the measurement of crack opening point.

収録刊行物

  • 材料

    材料 41 (470), 1642-1647, 1992

    公益社団法人 日本材料学会

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