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New technique created at INEGI determines adhesive joint properties in less time and with less resources

07 January 2021
A team of INEGI researchers has developed a new method capable of predicting, with less computational resources, but greater precision, the behavior of adhesive joints.

The propagation of cracks, plasticity, and hyper-elasticity are some of the properties calculated using this method, which in comparison with traditional techniques requires less time and less computational power.

Before going on to industrial production and fulfilling their function of joining components in electrical equipment, automobiles, or countless other products, adhesives are born from computational models, based on the numerical analysis of their components. These models simulate the real conditions of use of the adhesive, and determine if its mechanical properties are up to what is required.

To simplify this process, which is typically adapted on a case-by-case basis and requires hours of programming, INEGI's researchers have developed the "Natural Neighbour Radial Point Interpolation Method” (NNRPIM).

It is a meshless method that, as explained by Raul Campilho, responsible for the project at INEGI, "uses the geometric concept of interpolation based on the closest neighbour, in which the estimated value is always equal to your closest sample".

Characterizing large structures or deformed structures is thus simpler, since fewer measuring points are needed. This method is also advantageous for characterizing adhesive joints joined with highly ductile and resistant adhesives.

"All the numerical work we performed was verified through experimental tests, thus guaranteeing the accuracy of the numerical predictions”, adds the expert.

This is just one of several projects underway at INEGI dedicated to structural bonding technology. Today, these adhesives have numerous practical applications, from leading industries such as automotive and aeronautics, to more traditional industries such as electronics and furniture. And as pointed out by Lucas Silva, responsible for the area of ​​advanced bonding processes at INEGI, "using innovative configurations, experimental tests, and prototype development, we continue to create new solutions to meet the needs of companies".

The project "Analyzes of adhesively-bonded joints using meshless methods" is co-financed by FCT - Foundation for Science and Technology.