任意分布力を受ける表面き裂の応力拡大係数の解析　ＩＶ　　影響係数データベースの応力集中部材への応用

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  • Analysis of stress intensity factors for surface cracks subjected to arbitrarily distributed surface stresses. (4th report. Application of influence coefficients for the cracks originating at the natches and welding joints).
  • ニンイ ブンプリョク オ ウケル ヒョウメン キレツ ノ オウリョク カクダイ

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The authors have developed an influence function method by which the stress intensity factor, K, for surface cracks can be analyzed easily for arbitrarily distributed surface stresses. The data of the influence coefficients. Kij, have been obtained for a semielliptical or a quarter-elliptical surface crack in a flat plate and for a semielliptical surface crack in a round bar. In this paper, the authors have shown how these data can be applied to the analysis of K for a surface crack originating at the stress-concentrated portions such as notch roots, welding joints and circular holes. It has been found that the proposed estimation scheme gives approximate values of K at most 10% higher than the exact values.

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