Steel and Composite Structures

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Study on load distribution ratio of composite pre-tightened tooth joint by shear nonlinearity

  • Gao, Yifeng (College of Field Engineering, Army Engineering University of PLA) ;
  • Li, Fei (Department of civil engineering, Chongqing Jiaotong University) ;
  • Zhao, Qilin (College of Mechanical and Power Engineering, Nanjing University of Technology) ;
  • Gao, Jiangang (Uint 32184 of PLA) ;
  • Shi, Lin (Department of civil engineering, Chongqing Jiaotong University) ;
  • Zhao, Zhiqin (College of Field Engineering, Army Engineering University of PLA)
  • Received : 2020.12.01
  • Accepted : 2021.07.08
  • Published : 2021.09.10
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Abstract

Load distribution has a great influence on the mechanical properties of composite pre-tightened multi-tooth connection. To obtain the load distribution mechanism of composite pre-tightened multi-tooth joints, the multi-tooth joints were studied by experimental and theoretical methods. First, an experimental study was conducted on three-tooth specimens with different tooth depths and tooth lengths, and the failure mode, bearing capacity and load distribution mechanism of the specimens were obtained. Then, based on the nonlinear constitutive of interlaminar shear, an analytical model for load distribution of composite pre-tightened multi-tooth joint was proposed to research the multi-tooth load distribution mechanism. Finally, the theoretical and experimental results were compared. The research showed: (1) The theoretical results of the multi-tooth load distribution ratio were in good agreement with that of the experimental results, the maximum error between the theoretical value and the experimental value of the three-tooth joint was 17.44%, and the minimum error was only 2.35%; (2) The load distribution ratio of composite pre-tightened multi-tooth was uneven, for three-tooth joints, the values of load distribution ratio from large to small were: the first tooth, the third tooth and the second tooth.; (3) Multi-tooth load distribution ratio changed with the change of external load. The change of load distribution ratio was obvious in the early stage of loading, and tended to be gentle in the later stage of loading.

Keywords

Acknowledgement

This work was financially supported by National Science Foundation of China under Grant (No.52008390, No.11702324), Technical Field Fund for the National Defense Base strengthening program (No.2020-JCJQ-JJ-518), Chongqing Science and Technology Bureau of China (No. KJQN201900714).

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