半だ円状表面き裂を有する丸棒の曲げにおける応力拡大係数の簡便評価式

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  • Stress intensity factor equations for a semi-elliptical surface crack in a shaft under bending.
  • ハン ダエンジョウ ヒョウメン キレツ オ ユウスル マルボウ ノ マゲニ オ

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A simple procedure for the determination of stress intensity factor K for the problems whose solutions cannot be obtained easily by numerical analysis is proposed. The method is based on the concept that if we choose two referential two-dimensional problems and two geometrically similar three-dimensional problems, the ratio of K in the three-dimensional problem is approximately equal to that in the two-dimensional problem. The accuracy of the solutions depends on the choice of referential problems. The applicability of this method is checked by applying it to a semi-elliptical surface crack in a finite-thickness plate and an edge crack in a plate with finite width. Finally, the stress intensity factors for a semi-elliptical surface crack in a round bar under bending are obtained by the proposed method, in which a plate with an edge crack under tension and bending and a shaft containing a semi-elliptical surface crack are chosen as referential problems.

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