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Publicações
Luís, R.M. e Guedes Soares, C. (2006), “Ultimate Strength of Transverse Plate Assemblies Under Uniaxial Loads”, Actas da III European Conference on Computational Mechanics Solids, Structures and Coupled Problems in Engineering (ECCM 2006), 2006, 5-8 Junho, Lisboa-Portugal, C.A. Mota Soares et.al.
In a ship usually there are many plates, they are load carrying elements and they must be designed to resist the loading. The critical condition is the strength of deck structures under in-plane compressive loads leading to elasto-plastic buckling collapse. Plates are not perfect elements and their imperfections must be taken into account during the design process. In [1] it was shown that the strength of rectangular plates was governed by the amplitude of the buckling mode. In [2] a design process was proposed to take into account the global imperfections. However, localized imperfections can appear in a ship in any number of ways, the most commonly found are caused by welding or local damage. So, it is important for the designer to take into account the ability of the plate to resist to these imperfections. Most of the studies of the effect of imperfections have concentrated on individual plate elements or in stiffened plates. In [3] the effect of localized imperfections on long plates was studied and in [4] the study was extended to smaller plates and to combined imperfections. In welded plates the generated or induced initial imperfections, tend to have similar patterns in adjacent plates. Therefore the study of individual elements may be representative of the behavior of panels made of various plates. Localized imperfections related with local damage are not periodic and one cannot assume that adjacent plates have similar pattern of localized imperfections. This study analyzes the behavior of panels made up of three individual plates with localized imperfections. The effect in the ultimate collapse load of the level of imperfection and of its spatial location was studied. It was found that local imperfections clearly changed the strength of the panel when combined with the global ones. The effects of changing the position of the localized imperfection depend much on the final shape of the imperfections (local plus global). The effect of the localized imperfections can not be ignored by the designer and must be taken into account.
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