New doctoral dissertation: The weakest adhesive John Fredrick Berntsen has studied in his doctoral dissertation is strong enough to lift a 1 500 kilos car with a bonded area of only 3×3 centimetres.

«Rough estimates, but under no means your standard glue from the kindergarten», says Berntsen.
The main task of the adhesives in his work is to connect the range of fundamentally different materials found in modern car bodies. Berntsen works at SFI CASA, were research evolves around multiscale testing, modelling and simulation of materials and structures subjected to extreme loadings.
Traditionally, car frames of steel extensively used spot-welding as the primary joining technique. New generations of car bodies require new, more flexible joining techniques.
Adhesives do not only join fundamentally different materials. They also increase the overall stiffness of the vehicles and improve crash performance. Plus, they act as corrosion barriers and reduce noise and vibration.
«The performance of the joints could have a significant impact on the overall behaviour of a component. Therefore, it is critical to have sufficiently accurate modelling strategies for adhesives».
The virtual models would be very beneficial for the industry as they replace the expensive and time-consuming physical tests. John Fredrick Berntsen defends his dissertation at NTNU, Department of Structural Engineering, 3 December.

Read more about his work in the article published at