Abstract
A two-component high-ductility adhesive (acrylic and catalyst based), SikaFast® - 5211 NT, was used to bond single overlap joints with mild steel adherends and 25 mm of overlap. One joint configuration used treated bonding surfaces while the other was did not employ treatment of the adherend surfaces, with the aim of studying the influence of the material surface treatment. The specimens were tensile tested in a INSTRON® universal testing machine and the non-treated surface have shown a strength four times lower than the treated surface. Several analytical methods were used to predict joint strength, with two methods achieving reasonably accurate failure load predictions.
Highlights
More than ever, adhesive bonding is becoming an important solution for achieving permanent mechanical joints
One of the most critical aspects of adhesive joints is their strong dependency on the surface preparation condition
It becomes evident that the surface preparation has a great influence on joint strength
Summary
Adhesive bonding is becoming an important solution for achieving permanent mechanical joints. Adhesive bonding enables the manufacture of products with clean and visually appealing joints (without outstanding features like bolts, welding marks, rivets, etc.), but perhaps their most important advantage is their ability to efficiently join two different materials. This is a critical factor in the manufacture of composite structures construction and it the increased use of these advanced materials has significantly expanded the use of structural adhesives. If the aim is to increase long term durability several options are available such as using vapor degreasing with an organic solvent such as trichloroethane, sandblasting (increasing the adhesive contact surface by roughening the metal surface) and chemical etching, by removing all the weakly bonded oxides and forming strongly bonded ones. In order to design a strong and durable joint, it is necessary to take into account several aspects such as: adhesion theory, adhesive properties, joint
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