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Numerical Investigation of T-joints with 3D Four Directional Braided Composite Fillers Under Tensile Loading

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Abstract

Numerical studied on T-joints with three-dimensional four directional (3D4D) braided composite fillers was presented in this article. Compared with conventional unidirectional prepreg fillers, the 3D braided composite fillers have excellent ability to prevent crack from penetrating trigone fillers, which constantly occurred in the conventional fillers. Meanwhile, the 3D braided composite fillers had higher fiber volume fraction and eliminated the fiber folding problem in unidirectional prepreg fillers. The braiding technology and mechanical performance of 3D4D braided fillers were studied. The numerical model of carbon fiber T-joints with 3D4D braided composite fillers was built by finite element analysis software. The damage formation, extension and failing process of T-joints with 3D4D braided fillers under tensile load were investigated. Further investigation was extended to the effect of 3D4D braided fillers with different braiding angles on mechanical behavior of the T-joints. The study results revealed that the filling area was the weakest part of the T-joints where the damage first appeared and the crack then rapidly spread to the glue film around the filling area and the interface between over-laminate and soleplate. The 3D4D braided fillers were undamaged and the braiding angle change induced a little effect on the bearing capacity of T-joints.

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Acknowledgments

The authors acknowledge the support of Beijing 3DBraiding Co. Ltd.

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Authors and Affiliations

  1. School of Aeronautic Science and Engineering, Beihang University (BUAA), Beijing, 100191, People’s Republic of China

    Xiao-kang Li, Zhen-guo Liu, Long Hu, Yi-bo Wang, Bing Lei & Xiang Huang

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  1. Xiao-kang Li
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  2. Zhen-guo Liu
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  3. Long Hu
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  5. Bing Lei
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  6. Xiang Huang
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Correspondence to Zhen-guo Liu.

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Li, Xk., Liu, Zg., Hu, L. et al. Numerical Investigation of T-joints with 3D Four Directional Braided Composite Fillers Under Tensile Loading. Appl Compos Mater 24, 171–191 (2017). https://doi.org/10.1007/s10443-016-9520-5

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