Effect of pitting corrosion on local strength of hold frames of bulk carriers (1st report) |
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| Institution: | 1. Research Institute, Nippon Kaiji Kyokai (ClassNK), 1-8-3, Ohnodai, Midori-ku, Chiba, 267-0056, Japan;2. Training Center, Nippon Kaiji Kyokai (ClassNK), 1-8-5, Ohnodai, Midori-ku, Chiba, 267-0056, Japan;1. Centre for Marine Technology and Engineering (CENTEC), Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, Lisboa 1049-001, Portugal;2. Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Croatia;1. Centre for Marine Technology and Ocean Engineering (CENTEC), Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;2. University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Croatia;1. Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, China;2. Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, China;1. Southampton Marine and Maritime Institute, University of Southampton, Boldrewood Innovation Campus, Southampton SO16 7QF, UK;2. National Centre of Advanced Tribology at Southampton (nCATS), Engineering and the Environment, University of Southampton, Highfield Campus, Southampton SO17 1BJ, UK |
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| Abstract: | Firstly, pitting corrosion observed on hold frames in way of cargo holds of bulk carriers which exclusively carry coal and iron ore has been investigated in detail. It was shown that the shape of the corrosion pits observed on them is a circular cone and the ratio of the diameter to the depth is in the range between 8 to 1 and 10 to 1, which is different from the trend observed for the bottom shell of the oil tanker where the ratio is in the range between 4 to 1 and 6 to1.Secondly, a series of tensile tests has been conducted to investigate the effect of pitting corrosion on tensile strength of members. It was pointed out that the tensile strength decreases gradually and the total elongation decreases drastically with the increase of the thickness loss due to pitting corrosion. The reduction of the tensile strength of the members with pitting corrosion is larger than that of members with uniform thickness loss in terms of average thickness loss.Thirdly, a series of compressive buckling tests has been performed to examine the influence of pitting corrosion on buckling behavior of members. It was found that compressive buckling strength of pitted members is smaller than or equal to that of members with uniform thickness loss in terms of average thickness loss.Finally, an elasto-plastic analysis by FEM has been carried out to simulate the compressive buckling test in order to validate the method of modeling members with pitting corrosion. An attempt has been made to simulate the compressive buckling behavior of pitted members using shell elements of which meshing size is almost the same as the original thickness of the pitted plate. |
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