Analysis of a struck ship with damage opening - influence from model and material properties uncertainties

Paper in proceeding, 2010

The conditions for damage stability and survivability of a ship struck by collision in arbitrary sea-state are, from a structural point of view, determined by the size and shape of the damage opening in its side shell. In the current investigation, explicit finite element analyses (FEA) are presented of a ship-to-ship collision scenario where the damage opening of a struck ship is calculated for a selection of damage degradation models and realistic material properties; here referred to as model and material properties uncertainties. The model uncertainty is considered as a possible (user-related) insecurity in the selection of the most appropriate damage degradation model for the analysis: the shear failure and the forming limit diagram (FLD) criteria. The uncertainty in material properties is accounted for in the constitutive material model description and the material parameters used in the two criteria. The size and shape of the damage openings predicted by the FEA are used in damage stability analyses in which the struck ship is subjected to wave motions in arbitrary sea-state and flooding into the damage opening.