Effect of Pitting Corrosion on Local Strength of Hull Structural Members

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Pitting corrosion is a great concern when considering the integrity of hold frame structures of bulk carriers. First, pitting corrosion observed on hold frames in way of the cargo holds of bulk carriers which exclusively carry coal and iron ore has been investigated in detail. It is shown that the shape of the corrosion pits observed on such structures consists of a circular cone and that the ratio of the diameter of the pit to the depth ranges between 8 to 1 and 10 to 1, which is different from the trend observed for the bottom shells of oil tankers where the ratio is in the range between 4 to 1 and 6 to 1. Second, a series of tensile tests was conducted to investigate the effect of pitting corrosion on the tensile strength of structural members. It was noted that tensile strength decreases gradually and total elongation decreases drastically with an increase in thickness loss due to pitting corrosion. The reduction in the tensile strength of members with pitting corrosion is greater than that of members with uniform thickness loss in terms of average thickness loss. Third, a series of compressive buckling tests was performed to examine the effect of pitting corrosion on the buckling behavior of members. It was found that the 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 FEM-based elasto-plastic analysis was 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 with a meshing size that is almost the same as the original thickness of the pitted plate.
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Effect of Pitting Corrosion on Local Strength of Hull Structural Members

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