Influence of corrosive wear on hull strength of sea-going ships

Abstract

Object and purpose of research. This paper discusses hulls of ships, both in-service and under construction. The purpose of the research is to evaluate and monitor the effect of corrosion wear on their global and local strength.
 Materials and methods. Corrosion wear was taken into account on the basis of the methodology of the Rules of the Russian Maritime Register of Shipping and service life test data for hull samples. The assessment of the corrosive wear effect on the local strength of the plates was carried out using the finite element method.
 Main results. The corrosive wear effect on the parameters of global and local strength of ship hulls is considered. Experimental fatigue curves are obtained from service-life test results for welded samples with and without corrosive wear. Numerical modeling of the change in the stress-strain state of the plate on the size and number of corrosion pits is performed. Various methods of accounting for corrosive wear in the rules of international and indigenous classification societies are considered.
 Conclusion. The obtained results demonstrate and confirm the need to take into account corrosive wear when calculating the overall and local strength of new and used ship hulls.