A procedure for numerically model surface of the corroded specimen. (3rd April 2023)

• Record Type: Journal Article
• Authors: Nugroho, Firman A.; Ehlers, Sören
• Is Part Of: Ships and offshore structures. Volume 18:Number 4(2023)
• Page Start: 469
• Page End: 484
• Publication Date: 2023-04-03
• Subjects: Probability model -- surface morphology -- pitting severity -- corrosion pits -- numerical modelling; Ships -- Periodicals; Offshore structures -- Periodicals; Marine engineering -- Periodicals; Marine engineering -- Technological innovations -- Periodicals; Ocean engineering -- Periodicals; Ocean engineering -- Technological innovations -- Periodicals; 623.8
• DOI: 10.1080/17445302.2021.2021608
• Languages: English
• ISSNs: 1744-5302

Abstract

ABSTRACT: 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.