船体开孔薄板面内剪切屈曲特性研究  

IN-PLANE SHEAR BUCKLING PERFORMANCE OF SHIP’S THINPLATES WITH HOLES

作　　者：朱兆一[1,2] 李晓文 蔡应强 陈清林[1,2] 彭苗娇 熊云峰[1,2] ZHU Zhao-yi;LI Xiao-wen;CAI Ying-qiang;CHEN Qing-lin;PENG Miao-jiao;XIONG Yun-feng(School of Marine Engineering,Jimei University,Xiamen,Fujian 361021,China;Fujian Provincial Key Laboratory for Naval Architecture and Ocean Engineering,Xiamen,Fujian 361021,China)

机构地区：[1]集美大学轮机工程学院,福建厦门361021 [2]福建省船舶与海洋工程重点实验室,福建厦门361021

出　　处：《工程力学》2023年第5期228-235,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(51909103);福建省自然科学基金项目(2021J01841,2021J01844,2021J01842);福建省教育厅项目(JAT200290)。

摘　　要：船体板材不可避免地存在不同形式的开孔,开孔破坏了结构的连续性,对结构的强度、稳定性具有重要影响,因此研究船体板开孔结构的屈曲特性对保证船舶安全十分重要。在面内载荷作用下,通过画框型剪切夹具、3D全场变形测量-分析系统等对两种不同形式的船体开孔薄板进行剪切屈曲试验,获得了圆形开孔板和方形开孔板的临界屈曲载荷、全场位移/应变信息和拉力-伸长率曲线等;考虑试验夹具的影响,基于Abaqus对不同形式的开孔板进行数值仿真,通过对开孔板进行特征值屈曲分析和非线性屈曲分析,获得了两种不同形式船用开孔薄板的屈曲、后屈曲力学响应信息。通过数值仿真与试验结果的对比研究,验证了数值仿真方法的有效性、准确性。在此基础上,重点剖析载荷-伸长率关系、典型时刻板面全场位移、临界屈曲载荷以及开孔边缘的应力分布响应特征,明确了面积等效情况下圆孔和倒圆角方孔对方形薄板剪切稳定性的影响。为船用薄板面内剪切稳定性的试验和仿真研究以及大型船体结构的设计优化、力学性能评估等提供有益参考。The hull plates inevitably have different holes,which reduce the continuity of the structure and have an important influence on the strength and stability of the structure.It is important to study the buckling performance of plates with holes to ensure the safety of ships.Under in-plane loads,the shear buckling tests are carried out on two types of thin plates with different holes using a picture frame fixture and a 3D full-field deformation measurement-analysis system.The critical buckling load,full-field displacement/strain information and load-elongation curves for the plate with circular hole and the plate with square hole are obtained.Considering the influence of test fixture,numerical simulation of thin plates with different holes is carried out based on Abaqus.And the eigenvalue buckling analysis and nonlinear buckling analysis are carried out to obtain the mechanical response information of ship plates under buckling and post-buckling.The effectiveness and accuracy of the numerical method are verified by comparing the numerical results with the experimental results.Then the load-elongation relationship,full-field displacement,critical buckling load and stress distribution characteristics at the edge of the hole are analyzed,and the influence of circular hole and filleted square hole on the shear stability of the square plate under the condition of equivalent area is identified.The findings would provide reference for the experiment and simulation of in-plane shear stability of thin plates as well as design optimization and mechanical performance evaluation of large ship structures.

关 键 词：面内剪切 屈曲 开孔板 剪切试验 稳定性 

分 类 号：U663.2[交通运输工程—船舶及航道工程]