疲労き裂進展解析の高精度化に関する研究 : 影響係数データベースを用いた表面き裂進展解析の高精度化・簡易化

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In this study, the authors have developed a software system based on influence function method using 3D-FEM input data and 3D-FEM result to improve prediction ability of fatigue crack growth analysis of surface cracks which initiates from root of boxing fillet welded joints of ship structures. The software system developed in this study uses the database of influence coefficients, K_<ij>, developed by one of the authors, Shiratori, for various types of surface crack through a series of FE-analyses. It is shown that crack growth result based on influence function method using 3D-FEM result is more accurate for experimental data than the result by a method based on linear approximation of arbitrary distributed stress. And further study, a simple approximate equation of arbitrary distributed stress in the cross section of virtual crack surface are determined to simplify crack growth analysis based on influence function method. Surface crack growth analysis based on influence function method using the approximate equation gives almost the same result of that based on influence function method using
社団法人日本船舶海洋工学会の論文