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Publications
Jiang , X. and Guedes Soares, C. (2016), “Residual strength of pitted mild steel plate subjected to biaxial compression”, Proceedings of the 35th International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2016), 19-24 June, Busan, South Korea
Structural deterioration over time due to corrosion increases the variability in structural properties and decreases the plate capability with time. The effect of corrosion wastage on the ultimate capacity of steel plates should be evaluated accurately. The present paper focused on the residual strength of pitted mild steel rectangular plate under biaxial compression. Although considerable effort has been made to predict the residual strength of corroded rectangular plates, most available formula either address on an individual loading, or square plate excluding effect of aspect ratio, or a number of to-be-decided parameters involved, hence it is rather difficult to be applied in real life. This paper aims to propose a more general and practical formula to predict the residual strength of pitted rectangular plates under biaxial compression through answering the following two questions: Do the classic formula for an intact rectangular plate suit for a corroded one? If they do, whether could the effect of pitting corrosion be interpreted in term of one key parameter effectively, without involving a number of to be decided parameters? Firstly, a numerical model is verified through a case study; Afterwards, a series of nonlinear FEM analysis are performed, changing geometrical attributes of both pits and plates, i.e., the radius and location of pits and the slenderness of plates. Based on those simulation results, it is found that the classic formula for a intact rectangular plate can be applied reasonably for pitting corroded plate; A unique parameter DOP(degree of pitting), easily obtainable via visual inspection, can be deployed to evaluate the effect of pitting corrosion with adequately accuracy and without bias to either longitudinal or transverse compressive stress. The proposed formula can provide guidance during the process of ship structural maintenance decision-making and strength reassessment conveniently.
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