Fraunhofer Institut IFAM
Klebtechnische Fertigung
Adhesive flow behaviour within joining Processes
Aim of this project is to analyse the flow behaviour of an adhesive thick-film which deforms due to a joining process. The adhesive is a Polyurethane-Epoxid-Polymer with high stability and viscosity. The film is about 10mm thick and is deformed by a stamp with a diameter of 40mm. Within a second deformation of 5mm takes place.
With the aid of an experiment the results of the simulation can be verified. The required force for deformation can be measured and compared with the results of the simulation.
Used Approach
Generate a two-dimensional, axis-symmetrical model for the described problem with ABAQUS and FLUENT. In the run-up it is necessary to analyse the rheology of the applied adhesive to identify material properties, e.g. fluid viscosity against strain rate. Preliminary simulations draw conclusions from occurring strain rate within the adhesive to estimate fluid viscosity. This information is required to setup an applicable FLUENT model.
In ABAQUS a displacement boundary condition is generated in order to move the stamp. ABAQUS also allows analysing the reaction forces caused by the deformation of the adhesive.
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Results
The experiment determines a reaction force of 7N. This is comparable to the calculated value in FEA-Simulation. The flow behaviour of the adhesive is visualised in the figure above. The allocation of the adhesive can be identified.
This simplified approach is origin for further investigations.
Funded by
Funded by Fraunhofer-Gesellschaft: MEF-Project
Project Partners
Fraunhofer Institut IFAM
Klebtechnische Fertigung
Ivo Fabian Neumann
Wiener Straße 12
28359 Bremen, GERMANY
ivo.neumann@ifam.fraunhofer.de
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