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Design Rules and Methods to Improve Joint Strength

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Handbook of Adhesion Technology

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Abstract

One of the main reasons for the increasing use of adhesive bonding is the fact that the stress distribution is more uniform than with other conventional methods of joining which enables to reduce weight. However, even in adhesive joints the stress distribution is not perfectly uniform and this leaves room for improvements. The major enemy of adhesive joints is peel or cleavage stresses. These should be reduced if strong joints are to be designed. In this chapter, the main factors influencing the joint strength are first discussed. The focus is on lap joints because these are the most common. Methods are then proposed to improve the joint strength by using fillets, adherend profiling, and other geometric solutions. Hybrid joining is also a possibility to improve the strength of adhesive joints, and adhesives may be used in conjunction with rivet or bolts, for example. Joints may be damaged in some way and it is important to discuss also methods to guarantee an efficient repair design. Finally, configurations are recommended for several types of joints such as butt joints, strap joints, cylindrical joints, and T joints. The main rule for all cases is to spread the load over a large area and reduce the peel stresses.

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Author information

Authors and Affiliations

  1. Department of Mechanical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal

    Lucas Filipe Martins da Silva

  2. Instituto de Ciência e Inovação em Engenharia Mecânica e Engenharia Industrial (INEGI), Rua Dr. Roberto Frias, 4200-465, Porto, Portugal

    E. A. S. Marques

  3. Instituto Superior de Engenharia do Porto (ISEP), Instituto Politécnico do Porto, Rua São Tomé, 4200-485, Porto, Portugal

    R. D. S. G. Campilho

Authors
  1. Lucas Filipe Martins da Silva
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  2. E. A. S. Marques
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  3. R. D. S. G. Campilho
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Correspondence to Lucas Filipe Martins da Silva .

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Editors and Affiliations

  1. Department of Mechanical Engineering, Faculty of Engineering of the University of Porto, Porto, Portugal

    Lucas F. M. da Silva

  2. Griffith School of Engineering, Griffith University (Gold Coast Campus), Southport Queensland, Australia

    Andreas Öchsner

  3. Department of Engineering Science, University of Oxford, Oxford, United Kingdom

    Robert D. Adams

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da Silva, L.F.M., Marques, E.A.S., Campilho, R.D.S.G. (2017). Design Rules and Methods to Improve Joint Strength. In: da Silva, L., Öchsner, A., Adams, R. (eds) Handbook of Adhesion Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-42087-5_27-2

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  • DOI: https://doi.org/10.1007/978-3-319-42087-5_27-2

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-42087-5

  • Online ISBN: 978-3-319-42087-5

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