Stress Distribution and Strength in Shear on the Adhesive Lap Joint Loading Bending Moment

  • Yukisaburo Yamaguchi
  • Susumu Amano
Part of the Polymer Science and Technology book series (POLS, volume 12)


The stress distribution and the maximum stress in shear at the circular area of adhesive lap joint were discussed theoretically and experimentally in this article. The joint carries the bending moment due to external force P which is parallel to lap surface and at a distance ℓ from the center of adhesive area. The following equation with respect to the maximum shear stress \({\tau '_{\max }}\) was derived and verified experimentally.
$${\tau '_{\max }} = \frac{P}{{\pi{R^2}}}(\frac{{2\ell }}{R}\alpha + \beta )$$
where R is radius of adhesive circular area; α and β are stress concentration factors and are 1.2 and 2, respectively.


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  1. 1.
    MIL- A - 5090B, “Standard Temperature Bend”.Google Scholar
  2. 2.
    ASTM D 1184-69, “Strength of Adhesive on Flexural Loading”.Google Scholar
  3. 3.
    Y. Yamaguchi and S. Amano, Preprint of I4th Symposium on Adh. of Japan, “Testing Method Strength”, 61 (1976).Google Scholar
  4. 4.
    L.R. Lunsford, Applied Polymer Symposia No. 3, Structural Adhesive Bonding “Stress Analysis of Bonded Joint”, Interscience (1966)Google Scholar
  5. 5.
    Y. Yamaguchi, S. Amano and K. Furukawa, Preprint of 15th Symposium on Adh. Of Japan, “Testing method of the Adhesive Strength in Shear”, 69 (1977).Google Scholar

Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • Yukisaburo Yamaguchi
    • 1
  • Susumu Amano
    • 1
  1. 1.Kogakuin UniversityTokyoJapan

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