Task and Function of the Bonding Material
The bonding materials have the task of firmly attaching the strain gauge to the measured object’s surface and transferring the object’s deformation without loss to the strain gauge. The various conditions, influences, and application options, require different bonding materials and installation methods. Bonding is the most important factor.
The particular advantages of this connection method, with regard to strain gauge installations, are as follows:
- The possibility of connecting different materials, even dissimilar ones. The connection is implemented at room temperature or higher temperatures, depending on the type of adhesive.
- It has no influence on the materials which are to be connected (however, some restrictions may apply for plastics).
- Chemically-hardening adhesives (these are only still used in strain gauge technology) are characterized by low moisture absorption rates.
- Control of working speed through the selection of different adhesive types or curing conditions (hot or cold curing).
- Higher specific electrical resistance contributes to higher insulation resistance between the strain gauge and the component.