疲労強度精査手法に関する基礎的研究 : 船殻構造へのき裂伝播アプローチの適用

概要

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Recently many proposal have been presented on fatigue strength estimation procedures. It is not, however, clear how FEM stress output ought to be used in the assessment of fatigue strength of welded components. Therefore in this study, a typical behavior of fatigue crack in welded structures is firstly made clear and it is confirmed that in the very early stage of stress cycle a fatigue crack could be generated and traceable. Secondly it is studied to summarize and categorize the crack growth curve by introducing a new design parameter, N^*=n(Δσ)^m, which is composed of number of cycle and stress range. And lastly a design proposal is demonstrated to make a common shell model FEM output compatible to fatigue crack propagation analysis by offering a basic solution of stress distribution inherent to fillet weld configurations.
社団法人日本船舶海洋工学会の論文
1994-09-04