SmartJoint - a novel strategy for metal-composite joining

Important results from the project

The overall aim of the project was to evaluate the potential of Smart Joint as a novel technology to improve the strength of carbon fibre reinforced polymers (CFRP) after riveting, for automotive applications. The goal is to enhance the mechanical properties of CFRP by introducing extremely thin metallic washers between the CFRP layers. The project focused on the material selection, laminate design, and the effect of surfaces on the properties of CFRP/metal joints.

Expected long term effects

The project provided increased knowledge of the specific requirements to obtain the appropriate bonding between the metal inserts and the composite layers, and how dry surface treatments of the inserts (i.e., laser or plasma) can increase the strength of the composite laminate. Mechanical testing of the CFRP laminate and riveting tests showed that this new reinforcement technique has the potential to improve the strength of metal/composite joints. The idea now is to pursuit a larger project to further develop Smart Joint including industrial partners.

Approach and implementation

The project is based on the collaboration between RISE and Linköping University. The research activities were shared by the actors according to their expertise and infrastructure. The implementation was done in three phases: 1 - Definition of parameters, i.e., the materials and properties desired for washers, and design of the composite/washer system 2 Manufacturing, i.e., production and surface treatment of washers, composite laminate manufacturing and joining 3 Testing, focused on mechanical properties and characterization of surfaces