A study on the influence of ageing of coatings on their mechanical properties and fracture in ballast tanks
Journal article, 2017

Inspections have shown that coatings used in water ballast tanks (WBTs) can fracture prior to their target design life. This has led to local corrosion of the substrate and unwanted maintenance which is time-consuming and costly for the ship owner. The objective of the current study is to show that ageing of marine coatings used in WBTs can reduce the coatings’ fracture strain to a level lower than the strain of the substrate. Laboratory tests were conducted to subject three commercial WBT coatings to different types of ageing. Changes in their mechanical properties were confirmed. Finite element analyses of a 4,400 TEU container vessel were carried out for a number of sea state conditions. The strains of the hull structure (i.e. the substrate) were calculated and compared with the fracture strains of the aged coatings. It was shown that, in many locations, the strain of the substrate can exceed the fracture strain of aged coatings. Finally, systematic study with pro-active coating condition performance monitoring is discussed.


finite element analysis

water ballast tank

coating fracture



Jonas Ringsberg

Chalmers, Shipping and Marine Technology, Marine Technology

Ships and Offshore Structures

1744-5302 (ISSN) 1754-212X (eISSN)

Vol. 12 Sup1 S268-S279

Chalmers Area of Advance Transport – funding 2017

Chalmers, 2017-01-01 -- 2017-12-31.

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