COMMAT

Multi-material assemblies, i.e. the use of metal structures combined with polymer or composite structures, are booming, particularly for lightening parts in the aeronautical and automotive sectors. Current and future developments are geared towards optimising structures by using the "right material" in the "right place" while guaranteeing acceptable performance in service. Although the industrial applications of multi-material assemblies are not yet well known, the intensity of the work carried out by the researchers and their progress reflect the interest of industrialists and scientists in these innovative and forward-looking technologies. L'Institut de Soudure is working on the development of multi-material assembly processes by combining specific surface treatments and material optimisation at the welding interface. For example, the mechanical properties of the joint differ according to the surface properties obtained by the surface treatments used, so it is essential to understand what phenomena are induced at the interface in order to carry out a complete analysis and adapt the welding configurations accordingly.

The objective of the resourcing is to study and understand the adhesion mechanisms at the interface of two materials with high gradient properties, typically a metal alloy (aluminium) and a polymer base (carbon fibre composite), during conventional induction bonding.