摘要
为研究湿热环境下复合材料螺栓连接结构的静力拉伸性能,通过对七种不同端径比的T300碳纤维复合材料单钉单剪螺栓连接结构进行静力拉伸试验,得到不同端径比的连接结构在25℃干态(RTD)和70℃平衡吸湿(ETW)环境下极限失效载荷和破坏强度的变化规律,揭示了接头的破坏模式;建立复合材料单钉单剪螺栓连接有限元模型,对比不同端径比的连接结构试验的极限失效载荷,得到最优端径比为3;研究了湿热环境下最优端径比的连接结构不同铺层的损伤形式。结果表明,端径比从1增大到3时,RTD和ETW环境下连接结构的极限失效载荷分别增加了1.1倍和1倍,破坏强度均增加了1倍,当端径比从3增大到4时,RTD和ETW环境下极限失效载荷分别降低了6.56%和9.08%,破坏强度分别降低了6.83%和9.35%;在最优端径比下,与RTD环境下相比,ETW环境下连接结构的极限失效载荷和破坏强度分别下降了9.25%和9.52%,并且层合板孔周的压缩损伤更严重,存在更明显的纤维束拔起及纤维碎裂。
In order to study the static properties of the carbon fiber reinforced composite(CFRP)bolted joint structure under hygrothermal environment,the static tensile tests of the T300 composite single-bolt single-lap bolted jointed structure with different end-to-diameter ratios were conducted,and the failure mode of the joint was revealed by the variation of the ultimate failure load and the failure strength of the 25℃room temperature dry(RTD)and 70℃equilibrium temperature wet(ETW)environment with different end-to-diameter ratios.A finite element model of composite single-bolt single-lap bolted connection was established,and the optimal end-to-diameter ratio of 3 was obtained by comparing it with the test.The damage forms of different plies of the optimal end-to-diameter ratio connection structure in the hygrothermal environment were studied.The results show that when the end-to-diameter ratio is increased from 1 to 3,the ultimate failure load of the connection structure under the RTD and ETW environments is increased by 1.1 times and 1 times respectively,the failure strength is increased by 1 times,and when the end-to-diameter ratio is increased from 3 to 4,the ultimate failure load in the RTD and ETW environments is reduced by 6.56%and 9.08%respectively,the failure intensity is reduced by 6.83%and 9.35%respectively.When the optimal end-to-diameter ratio is 3,the ultimate failure load and failure strength of the connection structure in the ETW environment are reduced by 9.25%and 9.52%respectively,compared with the RTD environment.By scanning electron microscopy,it was found that the compression damage around the hole of the laminate plate under the ETW environment was more severe,and more obvious fiber bundle uplift and fiber fragmentation could be found.
作者
贾宝惠
任鹏
宋挺
崔开心
肖海建
JIA Baohui;REN Peng;SONG Ting;CUI Kaixin;XIAO Haijian(College of Transportation Science and Engineering,Civil Aviation University of China,Tianjin 300300,China;College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China;College of Safety Science and Engineering,Civil Aviation University of China,Tianjin 300300,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2024年第5期242-248,共7页
Materials Reports
基金
国家自然科学基金(U2033209)。
关键词
复合材料
湿热环境
端径比
螺栓连接
单钉单剪
静力拉伸
composite
hygrothermal environment
end-to-diameter ratio
bolted joint
single-bolt single-lap
static tensile
