A procedure for numerically model surface of the corroded specimen

The paper presents a procedure for numerically modelling the surface of corroded specimens. A 3D laser scan is utilised to derive surface morphology and corrosion pit depth distribution. This corrosion depth is analyzed with a probability model to assess the morphology difference and the characteris...

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Bibliographic Details
Published in:Ships and offshore structures 2023-04, Vol.18 (4), p.469-484
Main Authors: Nugroho, Firman A., Ehlers, Sören
Format: Article
Language:English
Subjects:
Corrosion
corrosion pits
Depth
Finite element method
Gaussian distribution
Mathematical models
Morphology
Normal distribution
numerical modelling
pitting severity
Probability model
Probability theory
Procedures
Statistical analysis
Stress distribution
surface morphology
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Summary:The paper presents a procedure for numerically modelling the surface of corroded specimens. A 3D laser scan is utilised to derive surface morphology and corrosion pit depth distribution. This corrosion depth is analyzed with a probability model to assess the morphology difference and the characteristic of the corrosion pit depth at a particular volumetric change. Furthermore, the goodness fit test statistic is carried out to observe the propensity of corrosion depth to a specific distribution, i.e. the Gaussian and non-Gaussian. The corroded specimens that conform to Gaussian distribution are numerically modelled with ANSYS APDL to generate a Gaussian surface. Furthermore, the non-Gaussian surface model is simplified as a single corrosion pit with various geometrical shapes. The mesh convergence is carried out to provide accurate stress distribution . The procedure is adjustable and applicable to the other surface morphology.
ISSN:1744-5302
1754-212X
DOI:10.1080/17445302.2021.2021608