摘要
板结构的稳定性在船舶设计和强度校核中占据重要地位。为研究船体薄板的剪切稳定性,本文设计画框式夹具对方形薄板进行面内剪切屈曲试验,试验中采用三维数字图像相关法(3 Dimensions Digital Image Correlation,简称3D-DIC),获得了载荷-端部伸长率曲线、全场位移/应变等力学响应信息。载荷-端部伸长率关系揭示了薄板在面内剪切工况下的承载特性,确定了屈曲失稳临界载荷;通过分析薄板在典型时刻的位移场、应变场信息,发现薄板的法向变形会随面内剪切载荷增加而增大。薄板失稳后,沿垂直对角线存在对称分布的三个半波,内部波幅大于外部波幅,应变波形和云图在后屈曲过程中会趋于稳定。通过分析薄板关键点的法向位移和米塞斯应变随时间的响应曲线,提出并验证了一种识别面内受剪薄板屈曲失稳的新方法。本文为船用薄板面内剪切稳定性的试验研究和力学行为分析等提供了有益参考。
The stability of thin plates plays an important role in ship design and strength check.To investigate the shear stability of ship's thin plates,a picture frame fixture was designed to conduct an in-plane shear buckling test on square thin plates.In the test,3D Digital Image Correlation(3D-DIC)was used to obtain mechanical response information such as load-end elongation curve,full-field displacement/strain,etc.The load-end elongation relationship reveals the load-bearing characteristics of the thin plate under in-plane shear condition and determines the critical load for buckling instability.According to the displacement and strain field information of the thin plate at typical moments,it is found that the normal deformation of the thin plate increases with the increase of in-plane shear load.After the instability of the thin plate,there are three halfwaves symmetrically distributed along the vertical diagonal,and the internal wave amplitude is greater than the external wave amplitude.The strain waveform and contour plot tend to stabilize during the post-buckling process.By analyzing the response curves of the normal displacement and Mises strain at the key points of the thin plate with time,a new method for identifying the buckling instability of in-plane sheared thin plates was proposed and verified.This study provides a useful reference for experimental research and mechanical behavior analysis of in-plane shear stability for ship’s thin plates.
作者
李晓文
朱兆一
彭苗娇
陈清林
蔡应强
李妍
LI Xiao-wen;ZHU Zhao-yi;PENG Miao-jiao;CHEN Qing-lin;CAI Ying-qiang;LI Yan(School of Marine Engineering,Jimei University,Xiamen 361021,China;Fujian Provincial Key Laboratory for Naval Architecture and Ocean Engineering,Xiamen 361021,China)
出处
《船舶力学》
北大核心
2025年第10期1608-1617,共10页
Journal of Ship Mechanics
基金
国家自然科学基金资助项目(51909103,52301320)
福建省自然科学基金项目(2023J01788,2021J01841,2021J01844,2021J05164)
福建省科技厅对外合作项目(2022I0019)
集美大学国培计划项目(ZP2023008)。
