开孔补强对受剪复合材料工字型梁腹板稳定性的影响研究  

Effect of cutout and edge reinforcement on buckling and postbuckling responses of composite I-section beams under shear load

作　　者：张健 刘伟[1] 高维成[1] ZHANG Jian;LIU Wei;GAO Wei-cheng(Astronautics Science and Mechanics,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学航天科学与力学系,哈尔滨150001

出　　处：《船舶力学》2018年第10期1241-1248,共8页Journal of Ship Mechanics

基　　金：国家自然科学基金项目(11772110)

摘　　要：文章通过试验与数值仿真计算研究了开口与补强对复合材料工字型梁腹板稳定性的影响。含长圆形开口复合材料工字型梁腹板一端被固定在试验架上,另一自由端被施加竖向剪切载荷。运用有限元软件Nastran对两种不同类型的复合材料工字型梁腹板(带长圆形开口和带开口补强)进行仿真分析,利用线性屈曲计算得到屈曲荷载,通过非线性静力分析研究其后屈曲过程,并通过实验验证了数值模型和仿真计算结果。在非线性分析中对工字型梁载荷—挠度的响应进行了分析,并用"蔡吴失效准则"预测了工字型梁的首层破坏载荷。研究结果表明:工字型梁腹板的长圆形开口周边应力/应变集中现象显著,应变值为非开口区域的三倍以上;插层补强能有效地降低口边应力/应变集中程度,同时使其结构稳定性承载力提高88%,极限破坏载荷提高了46.3%。本研究可为指导含孔梁腹板结构优化设计及其在实际工程上的选型应用提供试前分析依据和参考思路。This paper presents an experimental investigation into the influence of cutout and edge reinforcement on the stress concentration,buckling and post-buckling behavior of a carbon/epoxy composite I-section beam.The cantilever I-section beam with an elliptical cutout in the web is clamped at one end and subjected to a shear load at the other free end.Both experimental and numerical investigations are carried out to study the influence of cutout and edge reinforcement around cutouts where the stress/strain concentration and local buckling happens.The post-buckling behavior of the beam is observed and analyzed.Tsai-Wu failure criterion is employed to detect the first-ply-failure load in nonlinear analysis by predicting the load-deflection response.It is observed that the stress/strain concentration near the vicinity of cutout is considerable and edge reinforcement is effective in terms of reducing the cutout induced stress concentrations by about 50%.Good agreements were obtained between the numerical simulations and test results.The results show that the reinforcement has an attractive effect on the buckling stability by 88%as well as can improve the critical failure load by 46.3%.These findings should contribute to optimization design and engineering application in practical structures with similar shape and loading conditions.

关 键 词：复合材料工字型梁 开口补强 屈曲 蔡吴失效准则 破坏模式 

分 类 号：U668.5[交通运输工程—船舶及航道工程]