Abstract
Pitting corrosion is typical corrosion observed on coated hold frames of bulk carriers which exclusively carry coal and iron ore. In order to ensure 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 plates under combined axial compression and shear. It has been revealed that ultimate strength of pitted plates subjected to compression and shear loads is smaller than that of uniformly corroded plates in terms of average thickness loss of the whole plate and prediction results of ultimate strength using average thickness loss at the minimum cross section would be conservative. An evaluation method of residual strength of pitted plates was developed as a function of DOP (degree of pitting intensity), pit diameter and original thickness of the plates.
