Influence of the corrosion pit geometry on the stress distribution within a single artificial pit

A lower pitting severity produces a shallower corrosion pit shape on a corroded ballast tank. Pit distributions of corroded specimens have a probability model for the non-Gaussian surface. Therefore, the present work focuses on the numerical study of stress distribution within the corrosion pit area, while considering different corrosion pit geometries. Accordingly, 45 dog bone-shaped finite element models with a single corrosion pit are investigated. The geometrical parameters of the corrosion pit are analyzed with quantitative correlations at different sizes, shapes, and different levels of enlargement. Additionally, a corrosion pit alteration scenario is proposed, with a narrow deep, hemispherical, and final shallow wide form. Results show that the stress concentration factor remains relatively constant at the pit edge and increases toward the pit bottom. Furthermore, stress declines on the pit bottom and shallower corrosion pit form, which conforms to the polynomial trendline.

Subjects

Corrosion pit geometries

FE analysis

stress concentration factor

non-Gaussian surfaces

corrosion pit changes

pitting severity

corroded ballast tank

volumetric changes

DDC Class

600: Technik

620: Ingenieurwissenschaften

Funding Organisations

Deutscher Akademischer Austauschdienst (DAAD)

More Funding Information

This work was supported by Deutscher Akademischer Austauschdienst [57440921].

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Influence of the corrosion pit geometry on the stress distribution within a single artificial pit