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Failure Mode and Failure Load of Adhesively Bonded Composite Joints Made by Glass Fiber-Reinforced Polymer

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Abstract

Failure mode and failure load of composite joint design has become a very vital research area for being a weak part of composite structures in aircraft segments. So the objective of this study is to investigate the effect of different parameters on the shear strength and failure mode of adhesively bonded single-lap and scarf joints. The parameters included the overlap length, adherend thickness, and adhesive thickness of single-lap joints, and also the effect of single and double scarf angles of scarf joints. The results showed that in single-lap joints, the increasing overlap length led to increase shear strength until the length-to-width ratio becomes same value. The final failure mode of most tested thin adherends bonded joints with similar specimens was the delamination, while the interfacial failure mode occurred in thick adherends bonded joints. The shear strength increased when the adhesive thickness was reduced. On the other hand, in scarf joints, the ultimate shear strength was obtained when the scarf angle was around θ = 18°, while when scarf angle reached θ = 75°, the shear strength was decreased. The failure mode of scarf joints occurred at the interfaces between the scarf angles.

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Authors and Affiliations

  1. Mechanical Department, Faculty of Industrial Education, Sohag University, Sohag, Egypt

    Moataz H. Ata & Mohamed Abu-Okail

  2. Housing and Building National Research Center, Cairo, Egypt

    Ghada M. F. Essa

  3. Mechanical Engineering Department, Faculty of Engineering at Shoubra, Benha University, Benha, Egypt

    T. S. Mahmoud

  4. Mechanical Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt

    Ibrahim Hassab–Allah

Authors
  1. Moataz H. Ata
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  2. Mohamed Abu-Okail
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  3. Ghada M. F. Essa
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  4. T. S. Mahmoud
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  5. Ibrahim Hassab–Allah
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Correspondence to Mohamed Abu-Okail.

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Ata, M.H., Abu-Okail, M., Essa, G.M.F. et al. Failure Mode and Failure Load of Adhesively Bonded Composite Joints Made by Glass Fiber-Reinforced Polymer. J Fail. Anal. and Preven. 19, 950–957 (2019). https://doi.org/10.1007/s11668-019-00678-y

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  • DOI: https://doi.org/10.1007/s11668-019-00678-y

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