A qualitative, process‐parameter‐based model for the release agent transfer during CFRP‐part production: an approach to increase the initial bondability

Background 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. Thus, the general and specific efficiency (e.g. eco-efficiency) is enlarged [1, 2]. Unfortunately, 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]. Compared with classical joints, adhesive bonding is therefore the more promising joining technique due to a more homogeneous load distribution and its capability to join thermoset and even different materials [5]. To provide a structural and durable bond, the adhesion between the CFRP-part and the adhesive has to be guaranteed [6], which is actually the most relevant challenge Abstract