Adhesive fracture

Adhesive fracture is a specific type of adhesive failure where the adhesive comes loose due to faulty surface treatment or wrong adhesive selection.
In contrast to cohesive failure, where the adhesive breaks in the middle, in adhesive fracture the adhesive no longer adheres to one of the connected surfaces.

However, there are high-strength adhesives (e.g. phenolic resin adhesives) that exhibit adhesive fracture even under optimal conditions.

This can be tolerated if good results are still achieved after ageing. This means only a slight decrease in strength, no infiltration, no jointing part corrosion, etc. In the case of adhesive fracture, in addition to the type of fracture, it must also be stated at which jointing part the detachment takes place.

If the connection has a more complex structure, e.g. if a layer system is used as one of the two jointing partners, the boundary layer at which failure occurs must be named.

The more boundary layers exist, the more complicated this becomes.