Knowledge Load types of adhesive joints

We distinguish five main types of load:

  1. Shear forces: the forces acting parallel to the adhesion. They are more common than tensile forces.
  2. Tensile forces: The forces acting perpendicular to the adhesive and spread evenly over the entire bonding surface.
  3. Splitting forces: These forces are not distributed uniformly over the adhesion area, but are concentrated in a limited space.
  4. Peel forces: These forces act only on the edge of the bonded area so that only a small amount of adhesion can counteract them.
  5. Shear and tensile forces are normally not a problem, due to he force being distributed over the entire adhesive surface.

Splitting and peeling stresses should be avoided in construction, because the force is distributed only on a small portion of the adhesive surface.

Other factors involved in adhesion are dynamically changing loads, vibrations, etc.

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