3.5 Properties of thick and thin adhesive films
Differentiation: Structural bonding – Elastic bonding
In everyday language:
Differentiation based on the thickness of the adhesive film.
In this connection:
Structural bonding: high strength bonds, thin adhesive film
Elastic bonding: medium strength bonds, thick adhesive film
However: An elastic bond can, depending on its use, also be structural!
Differentiation: Whether a thick or thin adhesive film is used depends on the application and the adhesive. Clear differentiation, for example by citing a millimetre thickness, is not possible. There is a gradual transition that depends on the modulus and force.
Important to know: For different adhesive film thicknesses, the mechanical properties such as the strength and elongation at fracture differ.
Properties of thick adhesive films:
Force F → Deformation of the adhesive
Note: Every adhesive has a maximum permissible deformation.
→ The greater the adhesive film thickness, the smaller the deformation of the adhesive for the same force.