Publications

Huang, W., Garbatov, Y. and Guedes Soares, C. (2014), “Fatigue reliability of a web frame subjected to random non-uniform corrosion wastage”, Structural Safety, Vol. 48, pp. 51-62.

An approach for reliability assessment of a welded structure subjected to corrosion degradation and fatigue is developed. The objective of this work is to evaluate the fatigue reliability of a complicated ship welded structure subjected to random non-uniform corrosion and fatigue loading simultaneously. A three-dimensional finite element model accounting for randomly distributed non-uniform corrosion wastage based on non-linear time-dependent model is generated. A total of 4200 randomly corroded surface geometries were simulated by the use of Monte Carlo simulation technique for different service times of corrosion wastage and linear elastic finite element analysis are performed. Hot-spot stresses around welded details in a stiffener frame joint are determined. Based on nonlinear regression analysis, the time-dependent functions for the hot-spot stresses affected by corrosion deterioration are fitted. The relationship between the structural fatigue damage and corrosion deterioration caused by corrosion thickness wastage at different times is quantified employing S-N approach. The statistical properties of fatigue damage and service life of critical hot-spots in the stiffener frame welded joint are estimated taking into account random non-uniform time-dependent corrosion wastage. The fatigue reliability of the stiffener frame welded joint during its service life is modeled as a series system of correlated components using the Ditlevsen bounds method.

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