含初始缺陷不锈钢柱壳的多模态屈曲特性  

Multimodal Buckling Characteristics of Stainless Steel Cylindrical Shells with Initial Defects

作　　者：王黎辉[1] 冯杰 唐文献[1,2] WANG Lihui;FENG Jie;TANG Wenxian(School of Mechanical Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,Jiangsu,China;Jiangsu Provincial Key Laboratory of Advanced Manufacture and Process for Marine Mechanical Equipment,Zhenjiang 212003,Jiangsu,China)

机构地区：[1]江苏科技大学机械工程学院,江苏镇江212003 [2]江苏省船海机械先进制造及工艺重点实验室,江苏镇江212003

出　　处：《中国海洋平台》2023年第2期84-90,96,共8页China offshore Platform

基　　金：国家自然科学基金(编号:52171258)。

摘　　要：以海洋平台圆柱壳桩腿为研究对象,研究不锈钢柱壳在受到局部腐蚀和未受到腐蚀两种情况下的屈曲特性,其中用柱壳局部区域均匀减薄模拟桩腿腐蚀。对一组未减薄的完好柱壳和一组经过减薄加工的腐蚀柱壳进行初始缺陷测量、轴压试验和数值分析。通过试验获得柱壳临界屈曲载荷。对柱壳进行线性屈曲分析,得到柱壳前50阶模态缺陷和屈曲特征值。采用Riks弧长法对赋予初始缺陷幅值的柱壳前50阶模态缺陷进行非线性屈曲分析,得到柱壳的平衡曲线、临界载荷。在此基础上,研究初始缺陷对受到局部腐蚀和未受到局部腐蚀不锈钢柱壳屈曲的影响,并在多模态缺陷条件下对其最差阶模态进行探究。结果表明:与未受到腐蚀的柱壳相比,受到腐蚀的柱壳对初始缺陷的敏感性更低,对不同模态缺陷的敏感性更低;对于未受腐蚀的普通不锈钢柱壳而言,最差的模态缺陷并不是通常认为的第1阶,也有可能出现在高阶模态中。Taken the cylindrical shell pile leg of the offshore platform as the research object,the buckling characteristics of stainless steel cylindrical shell under local corrosion and non-corrosion conditions are studied,and the local regional uniform thinning of the cylindrical shell is used to simulate the corrosion of pile leg.The initial defect measurement,axial compression test and numerical calculation are carried out for a group of unthinned intact cylindrical shells and a group of thinned corroded cylindrical shells.The critical buckling load of the cylindrical shell is obtained through experiments.The first 50order modal defects and buckling eigenvalues of the shell are obtained by linear buckling analysis of the shell.The Riks arc length method is used to perform nonlinear buckling analysis of the first 50order modal defects with initial defect amplitude,and the equilibrium curve and critical load of the shell are obtained.On this basis,the influence of initial defects on the buckling of stainless steel shell subjected to local corrosion and not subjected to local corrosion is studied,and their worst modes are investigated under the condition of multi-mode defects.The results show that:the corroded shell is less sensitive to initial defects and different modal defects than the uncorroded shell;for stainless steel cylindrical shells,the worst modal defects are not of order 1as commonly thought,but may also occur in higher order modes.

关 键 词：不锈钢柱壳 壁厚减薄 初始缺陷 轴向压缩 屈曲特性 

分 类 号：P75[天文地球—海洋科学]