Journal of Failure Analysis and Prevention

, Volume 19, Issue 4, pp 950–957 | Cite as

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

  • Moataz H. Ata
  • Mohamed Abu-OkailEmail author
  • Ghada M. F. Essa
  • T. S. Mahmoud
  • Ibrahim Hassab–Allah
Technical Article---Peer-Reviewed


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.


Failure mode Failure load Joint design Adhesive joints 



  1. 1.
    E.F. Karachalios, R.D. Adams, L.F.M. da Silva, The strength of single lap joints with artificial defects. Int. J. Adhes. Adhes. 45, 69–76 (2013)CrossRefGoogle Scholar
  2. 2.
    S.K. Panigrahi, Structural design of single lap joints with delaminated FRP composite adherends. J. Compos. Part B 51, 112–120 (2013)CrossRefGoogle Scholar
  3. 3.
    E.F. Karachalios, R.D. Adams, L. da Silva, Single lap joints loaded in tension with high strength steel adherends. Int. J. Adhes. Adhes. 43, 81–95 (2013)CrossRefGoogle Scholar
  4. 4.
    G.M. Song, H. Kweon, H.J. Choi, H.J. Byun, H.M. Song, J.S. Shin, J.T. Lee, Effect of manufacturing methods on the shear strength of composite single-lap bonded joints. J. Comp. Struct. 92, 2194–2202 (2010)CrossRefGoogle Scholar
  5. 5.
    Y.B. Park, M.G. Song, J.J. Kim, J.H. Kweon, J.H. Choi, Strength of carbon /epoxy composite single-lap bonded joints in various environmental conditions. J. Compos. Struct. 92, 2173–2180 (2010)CrossRefGoogle Scholar
  6. 6.
    J.M. Arenas, J.J. Narbon, C. Alia, Optimum adhesive thickness in structural adhesives joints using statistical techniques based on weibull distribution. J. Adhes. Adhes. 30, 160–165 (2010)CrossRefGoogle Scholar
  7. 7.
    R. Kahraman, M. Sunar, B. Yilbas, Influence of adhesive thickness and filler content on the mechanical performance of aluminum single-lap joints bonded with powder filled epoxy adhesive. J. Mater. Process. Technol. 205, 183–189 (2008)CrossRefGoogle Scholar
  8. 8.
    L. da Silva, M. Lopes, Joint strength optimization by the mixed—adhesive technique. J. Adhes. Adhes. 29, 509–514 (2009)CrossRefGoogle Scholar
  9. 9.
    S.M.R. Khalili, A. Shoukuhfar, S.D. Hoseini, M. Bidkhori, S. Khalili, R.K. Mittal, Experimental study of the influence of adhesive reinforcement in lap joints for composite structures subjected to mechanical loads. J. Adhes. Adhes. 28, 436–444 (2008)CrossRefGoogle Scholar
  10. 10.
    M.S. Senog, T.H. Kim, K.H. Nguyen, J.H. Kweon, J.H. Choy, A parametric study on the failure of bonded single lap joints of carbon composite and aluminum. Compos. Struct. 86, 135–145 (2008)CrossRefGoogle Scholar
  11. 11.
    K.S. Kim, J.S. Yoo, Y.M. Yi, C.G. Kim, Failure mode and strength of uni-directional composite single-lap bonded joints with different bonding methods. Compos. Struct. 72, 477–485 (2006)CrossRefGoogle Scholar
  12. 12.
    A. Taib, R. Boukhili, S. Achiou, S. Gordon, H. Boukhili, Bonded joint with composite adherends. Part I. Effect of specimen configuration, adhesive thickness, spew fillet and adherend stiffness on fracture. J. Adhes. Adhes. 26, 226–236 (2006)CrossRefGoogle Scholar
  13. 13.
    M. Afendi, T. Teramoto, H. Bakri, Strength prediction of epoxy adhesively bonded scarf joints of dissimilar adherends. J. Adhes. Adhes. 31, 402–411 (2011)CrossRefGoogle Scholar
  14. 14.
    A. Gacoin, P. Lestriez, J. Assih, A. Objois, Y. Delmas, Comparison between experimental and numerical study of the adhesively bonded scarf joint and double scarf joint: influence of internal singularity created by geometry of the double scarf joint on the damage evolution. Int. J. Adhes. 29, 72–79 (2009)CrossRefGoogle Scholar
  15. 15.
    R.D. Adams, J. Comyn, Structural Adhesive Joints in Engineering, Second Edition edn. (Bristol University, London, 1997)Google Scholar
  16. 16.
    G.E. Koricho, A. Khomenko, T. Fristedt, M. Haq, Innovative tailored fiber placement technique for enhanced damage resistance in notched composite laminate. J. Compos. Struct. 120, 378–385 (2015)CrossRefGoogle Scholar

Copyright information

© ASM International 2019

Authors and Affiliations

  • Moataz H. Ata
    • 1
  • Mohamed Abu-Okail
    • 1
    Email author
  • Ghada M. F. Essa
    • 2
  • T. S. Mahmoud
    • 3
  • Ibrahim Hassab–Allah
    • 4
  1. 1.Mechanical Department, Faculty of Industrial EducationSohag UniversitySohagEgypt
  2. 2.Housing and Building National Research CenterCairoEgypt
  3. 3.Mechanical Engineering Department, Faculty of Engineering at ShoubraBenha UniversityBenhaEgypt
  4. 4.Mechanical Engineering Department, Faculty of EngineeringAssiut UniversityAssiutEgypt

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