応力集中緩和のための有孔板の形状最適化法

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In the previous paper, to reduce the maximum stress around hatch corner etc without using local thick insert plate, a method of obtaining optimized shape of hatch corner was presented by means of finite element method applied to two dimentional stress analysis and geometrical shape optimization of free edge of perforated plate, where the effect of hatch coaming is neglected. In this procedure, geometrical constraints for hatch shape to make kept the opening zone and shape clear are taken into account. Above-mentioned Shape Optimization Method was applied to the optimization of hatch opening in an actual ship. And a simple and practical method to determine the optimum shape of hatch corner by assuming it as elliptic arc was proposed. In this paper factor of stress concentration around hatch corner of which shape is assumed to be elliptic arc is investigated as function of length and width of hatch opening and length of cross deck. And an approximate formula of obtaining the factor of stress concentration, as function of the dimensions of hatch and deck, is presented and it is shown that it gives practically satisfactory result comparing to those obtained by free optimization.
社団法人日本船舶海洋工学会の論文
1985-03-22