船体不連続部の最適形状について (第1報) : 一様引張り (圧縮) をうける無限板中の開口

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The stress concentration problem around a discontinuity in a hull given member is studied. As the first step, authors studied on the problem around a hole in an infinite elastic plate under the uniform loading. Authors bring the focus into finding out the optimum configuration which have minimum stress concentration factor among the holes having a given aspect ratio and being formed with fair curve, and lower limit value of the stress concentration factor. The configurations are chosen from those which are expressed by the mathematical descriptions, namely, the higher order ellipses and the modified ellipses. As the result of investigation, it has been shown that the optimum configuration is more similar to the rectangular rather than to the ellipse, which is usually considered as the one of the optimum configurations. The value of stress concentration factor is about 15% to 25% smaller than the ellipses. Studying the characteristic of tangential stress distribution around the hole edge, authors concluded that the distribution of the hole of the optimum configuration would be uniform. The distribution of the above result is approximatelyuniform, so these are approximately optimum configuration for the given aspect ratios. Authors proposed the inverse procedure to find a configuration with more uniform stress distribution from an initial one as the above approximate optimum configuration. Applying the procedure and investigating the result, authors concluded the above configuration is to be regarded practical optimum configuration and the value of the stress concentration factor is also the lower limit under the loading condition.
社団法人日本船舶海洋工学会の論文
1985-06-30

船体不連続部の最適形状について (第1報) : 一様引張り (圧縮) をうける無限板中の開口

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