表面疲労き裂の伝ぱ経路測定への画像処理の応用　　疲労き裂の発生・伝ぱのばらつきに及ぼす金属学的因子

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  • An application of image processing to measuring surface fatigue crack propagation path. (Some metallurgical factors affecting the scatter of fatigue crack initiation and propagation).
  • ヒョウメン ヒロウ キレツ ノ デンパ ケイロ ソクテイ ヘ ノ ガゾウ ショ

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From the line image of the surface fatigue crack path, three parameters which showed the features of the crack shape and length were defined and measured as the crack deflection ratio, the initiation angle and the propagation angle. The rotating bending fatigue tests in a high cycle region were carried out for three metals, low carbon steel with four grain sizes, copper and austenitic stainless steel which had different crystal structure and slip character. The parameters measured for each metal were investigated in the relation to metallurgical structures. As a result, the parameters, especially, the crack initiation angle and the propagation angle represented well the effects of slip character and grain size respectively. The statistical scatters of the crack initiation lives and the crack propagation rates were discussed by using the parameters of crack path with regard to metallurgical factors.

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