A Computational Investigation of the Group Effect of Pits on the Ultimate Strength of Steel Plates

作     者：FU Qiang FANG Hui WU Ren-xia YU Xue-hui LI Hua-jun 

作者机构：Institute of Coastal and Offshore Engineering School of Engineering Ocean University of China State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace Engineering Xi'an Jiaotong University 

出 版 物：《China Ocean Engineering》 (中国海洋工程（英文版）)

年 卷 期：2018年第32卷第6期

页      面：665-674页

核心收录：

学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0908[农学-水产] 07[理学] 0707[理学-海洋科学] 0807[工学-动力工程及工程热物理] 0815[工学-水利工程] 0824[工学-船舶与海洋工程] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：financially supported by the National Natural Science Foundation of China(Grant Nos.51490670 and 11572300) R&D Plan(Grant No.2017GHY15120) Fundamental Research Fund for Central Universities(Ocean University of China) 

主　　题：group effect localized corrosion post-buckling ultimate strength 

摘      要：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 ***, 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.