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Publications
Luís, R.M., Witkowska, M. and Guedes Soares, C. (2007), “Collapse Behaviour of Damaged Panels with Dimple Imperfection”, Proceedings of the 26th International Conference on Offshore Mechanics and Arctic Engineering (OMAE´07), 10-15 June, 2007, San Diego, California, USA, ASME, New York, Paper OMAE2007-29777.
This paper deals with the influence that a localised dimple imperfection, resulting from a damage, can affect the ability of a panel to resist in-plane compressive loads. A single damaged plate on a ship is not a severe problem, but if enough plates have been damaged then the ability of a panel to carry its intended load can be compromised. In this study a finite element non-linear analysis of panels having different geometry is carried out in order to identify the influence of each one in the collapse strength. The finite element model used is of a panel, 3 plates long and 3 plates across, in order to ensure that the dimple imperfection is isolated. It was found that the position of the dimple imperfection on the panel is an important factor, that the dimple imperfection not only reduces the collapse strength but induces a more violent collapse and that it has an influence over the mode of collapse.
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