船体構造部材の静的強度に及ぼす腐食の影響(第7報) : 圧縮最終強度, せん断最終強度に及ぼす腐食ピットの影響

概要

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Pitting corrosion is typical corrosion observed on coated hold frames of bulk carriers which exclusively carry coal and iron ore. In order to secure the safety of these types of bulk carriers, it is important to understand the effect of pitting corrosion on local strength of hold frames. In order to investigate this effect, a series of non-linear FE-analyses has been performed with pitted rectangular plates under compressive and shear loading conditions. It has been revealed that ultimate compressive and shear strength of pitted plates is smaller than that of uniformly corroded plates in terms of average thickness loss and that prediction results of ultimate strength using average thickness loss at the minimum cross section would be on the safe side. It has been also found that reduction of tensile strength due to pitting corrosion is larger than that of ultimate compressive and shear strength.
社団法人日本船舶海洋工学会の論文