The objective of this study is to obtain basic data for discussing the structural integrity of aged ships, especially hold frames of aged bulk carriers. Firstly, shapes of corrosion pits observed on hold frames of bulk carriers have been investigated. It was shown that the shape of the corrosion pits 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. Secondly, a series of tensile tests has been conducted to investigate the effect of pitting corrosion on tensile strength. It was pointed out that the tensile strength decreases gradually and the total elongation decreases drastically with the increase of thickness loss due to pitting corrosion. Thirdly, a series of 4-point bend tests with structural models which consist of shell, web and face plates simulating hold frames of bulk carriers has been carried out to investigate the effect of pitting corrosion on collapse behavior and lateral-distortional buckling behavior. Following the experiment, a series of non-linear FE-analyses has been also made. In the case where tensile load acted on the face plate, cracks were initiated at the bottom of the pits when pitting concentrated on the web near the face plate. On the other hand in the case where compression load acted on the face plate, lateral-distortional buckling has been observed and the ultimate load of the structural models where pitting developed regularly on the web was found to be almost the same as that of the structural models where the web has uniform corrosion corresponding to the average thickness loss.
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ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering
June 12–17, 2005
Halkidiki, Greece
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
0-7918-4196-0
PROCEEDINGS PAPER
Pitting Corrosion and Its Influence on Local Strength of Hull Structural Members Available to Purchase
Tatsuro Nakai,
Tatsuro Nakai
Nippon Kaiji Kyokai, Chiba, Japan
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Hisao Matsushita,
Hisao Matsushita
Nippon Kaiji Kyokai, Chiba, Japan
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Norio Yamamoto
Norio Yamamoto
Nippon Kaiji Kyokai, Chiba, Japan
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Tatsuro Nakai
Nippon Kaiji Kyokai, Chiba, Japan
Hisao Matsushita
Nippon Kaiji Kyokai, Chiba, Japan
Norio Yamamoto
Nippon Kaiji Kyokai, Chiba, Japan
Paper No:
OMAE2005-67025, pp. 25-35; 11 pages
Published Online:
November 11, 2008
Citation
Nakai, T, Matsushita, H, & Yamamoto, N. "Pitting Corrosion and Its Influence on Local Strength of Hull Structural Members." Proceedings of the ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. 24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 2. Halkidiki, Greece. June 12–17, 2005. pp. 25-35. ASME. https://doi.org/10.1115/OMAE2005-67025
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