A Computational Investigation of the Group Effect of Pits on the Ultimate Strength of Steel Plates |
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| Authors: | Qiang Fu Hui Fang Ren-xia Wu Xue-hui Yu Hua-jun Li |
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| Institution: | 1.Institute of Coastal and Offshore Engineering, School of Engineering,Ocean University of China,Qingdao,China;2.State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering,Xi’an Jiaotong University,Xi’an,China |
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| Abstract: | In this work, we focus on assessing the group effect of localized corrosion on the ultimate strength of the marine structural plates and study the load-deformation behaviors of plates of various slenderness and uniaxial compression. Meanwhile, we investigate different corroded patterns from a single circular pit to 25 circular pits distributed over the plate and carry out hundreds of nonlinear finite element simulations by combining the number, depth, distribution of pits with imperfections and slenderness of plate. The distribution of multiple pits causes scattering of stress concentration on the plate, then the plastic section of plate changes with wider distribution of damage simultaneously. The ultimate strength arises when un-loading zone comprised of the yielding strips and holes extends across the plate. It can be concluded that the corroded condition defined as group effect of pits manipulates the deformation state and the loading capacity of plate at the ultimate strength mode that coincides with the proportion of effective loading area and section in the process of post-buckling. To validate the effect of pits group, we perform the numerical experiments of the post-buckling of steel plates containing pits in a row with different orientation. |
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