Adhesive joining processes: Influences of process control, material selection and aging on the mechanical performance of hybrid multi-material systems
Themes: Process- and Joining Technology, Leichtbau, Process- and Production Engineering, Process-Tech Forum, Research and development in joining technologies
Modern, efficient application of lightweight materials is characterized by a cross-industry multi-material approach. Fiber-reinforced polymers like CFRP and lightweight metals (e.g. aluminium) are combined more frequently. In order to enhance the specific material benefits, the Institute of Material Research investigates in cooperation with scidentific institutions and industrial partners adhesive joining processes and examines the environmental influences on their mechanical properties. In particular, different pretreatment strategies are being investigated because they show significant effect. One focus is on laser-based methods as they are contactless and find cross-industrial application. In addition to the experimental approach, simulation methods are used to derive new failure models or design guidelines for adhesively bonded multi-material composites.
For example, comparative studies on adhesive joining showed how radiation and matter interact and affect the joining result. For instance, the treatment of the joining partners by means of an IR laser led to an increase in strength up to the final shear strength of the adhesive. In addition, innovative joining processes are being developed for thermoplastic-based fiber-reinforced plastics. By means of simple and inexpensive heat sources, the thermoplastic matrix is melted close to the surface and press-joined to a pre-treated metallic substrate. With the right pre-treatment strategy, the bond strength increases up to the particular material durability.