A Measurement of Fatigue Crack Tip Opening and Closing Points by Means of Strain Interference Method. Accuracy and Comparison with Unloading Elastic Compliance Method.

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  • ひずみ干渉法による疲労き裂開閉口点の測定（除荷弾性コンプライアンス法との比較と測定精度について）
  • ヒズミ カンショウホウ ニ ヨル ヒロウ キレツ カイヘイコウテン ノ ソクテ

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Abstract

Fatigue crack tip opening stress σop and closing stress σct can be easily determined with the relationship between the following strain functions f, h and the cyclic stress σ, f=(εy-β)/(εx+α), h=εy+λεx, where εy and εx are the strains measured in the vicinity of the crack center (or the crack face), and α, β and λ are constants. With regard to small-size specimens having a center crack or notch, the accuracy of this measurement method is confirmed. If the constants α, β and λ are chosen to proper values, the crack tip opening stress σop and closing stress σot can be judged from the inflection points of the σ-h diagram and σ-f diagram. These stresses coincide with the opening stress σop and the closing stress σct determined by the unloading elastic compliance method.

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