Effect of End-to-diameter Ratio on Static Tensile Failure of Composite Bolted Joints Under Hygrothermal Environment
JIA Baohui1,*, REN Peng2, SONG Ting2, CUI Kaixin2, XIAO Haijian3
1 College of Transportation Science and Engineering,Civil Aviation University of China,Tianjin 300300,China 2 College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China 3 College of Safety Science and Engineering,Civil Aviation University of China,Tianjin 300300,China
Abstract: 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.
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2024, Vol. 38 
