点腐蚀作用下非穿透低碳钢板的极限抗压承载能力数值分析  

Ultimate Compressive Capacity Analysis of Pitted Non-through Mild Steel Plates

作　　者：江晓俐[1] 吴卫国[1] 梁志勇[2] 陈宝松[1] 

机构地区：[1]武汉理工大学交通学院,武汉430063 [2]东华大学理学院,上海200051

出　　处：《武汉理工大学学报（交通科学与工程版）》2009年第6期1167-1170,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金项目(批准号:50809053);武汉理工大学科学研究基金项目(批准号:48-21070015)资助

摘　　要：点腐蚀作为海水浸没带腐蚀的一种主要形式,是现役船舶,特别是老龄船结构的重大安全隐患.为了研究点腐蚀对钢板的抗压极限承载能力的影响,文中对未穿透低碳钢板开展了非线性有限元分析.计算结果表明,单侧点腐蚀引起的偏心对钢板的极限抗压能力有显著影响.点腐蚀越密集(DOP越大),板越薄(β越大),点腐蚀深度改变造成板的极限承载能力差异越大,DOP达到或超过20%时尤其显著.大部分船体板属于典型的柔性板(β为3左右),海水全浸带腐蚀现象严重,点腐蚀密度大,仅采用点腐蚀密集度参数DOP来表征板点腐蚀破坏程度还有所欠缺,薄壁效应需要给予充分考虑.As one of main corrosion type of immersed ship hull, pitting corrosion could bring about heavy damage even accident to in-service ships, particularly old aged ships. To investigate effects of pits on ultimate compressive strength of mild steel plates, a series of non-linear FEM analysis on plates with non-through pits are undertaken in the paper. It is presented that eccentricity induced by one-side pits has considerable effects on ultimate compressive capacity of plates. The more intense the pits are（the larger DOP）, or / and the thinner-the plate is（the largerβ）, the difference of ultimate compressive capacity caused by change of pits depth is more serious, especially when DOP reaches or beyond 20%. Moreover, majority of ship applied plates belongs to typical slender plates（β≥3）,hence under severe immersed corrosion, it is not enough to occupy DOP exclusively to represent the extent of damage caused by pits, ＂thin-plate effect＂ should be given ample consideration.

关 键 词：点腐蚀 非线性有限元 极限承载能力 老龄船 

分 类 号：U661.40[交通运输工程—船舶及航道工程]