Abstract
Adhesive bonding shows a high potential to join carbon fiber reinforced plastics (CFRP), if the adhesion between adhesive and part surface is verified. Unfortunately, this adhesion is often reduced in case of the mold-based part production and its unavoidable application of release agents. Due to the resulting presence of release agent residues on the surface of the cured CFRP-parts the adhesion is lowered. To increase the bondability and correlating production efficiency, the amount of release agent transfer should be as small as possible, to reduce the effort in terms of bonding pre-treatment. To achieve this goal, a theoretical, qualitative model about the influence of the relevant processing parameters for a thermoset CFRP-production was developed focusing the (diffusion-based) transfer reduction based on an adapted processing. Indicating the time in which the diffusion is possible, as the main criteria.
Highlights
The application of carbon-fiber reinforced plastics offers a high potential to decrease the weight of structural parts, without decreasing the performance of the product
A theoretical, qualitative model about the influence of the relevant processing parameters for a thermoset carbon fiber reinforced plastics (CFRP)-production was developed focusing the transfer reduction based on an adapted processing
An increase of the temperature do not favor the diffusion this strongly [11]. Based on these conclusions and desiring a minimum amount of release agent transfer, the authors of the present study suggest, to increase the heating rate and the temperature due to the reduced gel time, with regards to material specific temperatures
Summary
The application of carbon-fiber reinforced plastics offers a high potential to decrease the weight of structural parts, without decreasing the performance of the product. There are significant challenges within the assembly respectively joining process of CFRPparts, especially if the matrix is a thermoset system. Conventional joining techniques cannot be applied due to its chemical composition (for example welding) or show significant disadvantages (mechanical joining e.g. riveting). The performance is decreased by the application of mechanical joints, since the elements cut the load bearing fibers or the fibers are cut by the priory performed drilling process. In addition a notch effect occurring around the rivet [3, 4]. Adhesive bonding is the more promising joining technique due to a more homogeneous load distribution and its capability to join thermoset and even different materials [5]
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