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Grupo de Estruturas Navais > 3.1 Resistência Última de Estruturas > Publicações
Liu, B., Garbatov, Y., Zhu, L. e Guedes Soares, C. (2018), “Numerical assessment of the structural crashworthiness of corroded ship hulls in stranding”, Ocean Engineering, Vol. 170, pp. 276-285
Corrosion wastage is one of the most important structural degradation phenomena of ageing ships and leads to severe consequences in reducing the strength of ship structures in all loading conditions during the service life. This paper investigates numerically the effect of steel corrosion degradation on the ship structural crashworthiness in grounding, considering the reduction of the thickness of structural components and the loss of material mechanical properties due to corrosion. Corrosion degradation causes the change of material properties, such as the Young’s modulus, yield stress, ultimate tensile stress and fracture strain, which determine the yielding, work hardening and critical failure strain of the material defined in an impact analysis. The mean values of accident statistics of grounding are considered to define the ship grounding depth, location, seabed shape and size. The objective of the paper is to develop a practical engineering assessment of the crashworthiness of ageing ship structures accounting for the corrosion degradation. The numerical analyses evaluate the reaction force and energy dissipation versus the ship damage during the grounding accident. The resistance of intact and corroded ship hulls is compared shown that, for example, the absorbed energy of the corroded ship hull decreases 33.8 % with a wasted thickness of 2.0 mm in stranding. In addition, some discussions are presented on the accuracy of numerical analyses.
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