ホットスポット応力基準による平板構造の疲労強度評価(第一報)

概要

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In design of a large marine structure, the assessment of fatigue strength is one of major design considerations. In evaluation of fatigue strength of welded toes, it is important to analyze the "hot spot stress" due to structural discontinuity accurately but in a single way. The hot spot stress will be defined as a conventional stress at an intersection of plates where fatigue crack is possibly expected to occur. For plate type structures, it is not clear how to define the hot spot stress. In this paper, using the experimental data of the model tests carried out by SR202 committee of Shipbuilding Research Association of Japan, a definition of the hot spot stress and S-N diagram for fatigue design of plate type structures were proposed. The hot spot stress for plate type structure is defined by linear extrapolation of measured strains with the location at distances of two points to the welded toe. The two points are 1 .57^4√<(T^3)> and 4.9^4√<(T^3)>, where design S-N diagram in term of the hot spot stress is newly defined named as SRF curve.
社団法人日本船舶海洋工学会の論文