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Publications
Sousa, S. and Garbatov, Y. (2016), “Coating breakdown assessment of steel plates in marine structures subjected to compressive load”, Maritime Technology and Engineering 3, Guedes Soares, C. & Santos T. A., (Eds.), Taylor & Francis Group, London, UK, pp. 557-568
The objective of the present study is to analyze the coating breakdown of steel plates in marine structures, subjected to uniaxial in-plane compression. A finite element model is developed and validated in the commercial software ANSYS. The behavior of the coated steel plate, which is subjected to an initial imperfection and a macro-delamination in the interface, is studied based on the eigenvalue buckling and nonlinear strength analysis. The compressive loads acting on the plate, in addition to the initial imperfections are caused by the inadequate steel surface preparation and/or poor coating application, leading to the local buckling of the coating layer. As the load increases, the buckled region increases reaching the critical size, when the coating layer starts to delaminate. Based on the exponential form of the cohesive zone model, a zero thickness interface element, to model the adhesion between plate and coating layer, is employed. When the stresses exceed the critical ones, the separation/delamination across the interface initiates. The influence of the delamination length, coating thickness, mechanical and interface properties on the buckling and post-buckling behavior of the steel plate coating are also studied and a coating failure assessment for the macro-delamination diameters are developed.
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