Influence of surface treatment and ageing on static and fatigue behavior of Aluminium/Acrylic PSA joints

Abstract

Los adhesivos piezosensibles (cintas adhesivas) presentan una serie de ventajas a la hora de aplicarlos en aplicaciones industriales, tales como una adhesión rápida, fácil aplicación, propiedades viscoelásticas que proporcionan un alto nivel de resistencia a los impactos y amortiguación de vibraciones, etc. Dentro de estos adhesivos piezosensibles, las cintas de espuma acrílica se emplean cada vez como alternativa en el ensamblaje como sustitutivo de uniones mecánicas o adhesivos en forma de liquido o pasta ]. Las aplicaciones de estas cintas incluyen aplicaciones en vehículos de transporte público, mobiliario urbano, revestimientos arquitectónicos, etc.. Estas cintas no requiere de curado y entre sus ventajas incluyen la capacidad de sellado, flexibilidad, amortiguación, resistencia a la fatiga, resistencia a la radiación UV y durabilidad a largo plazo comparada con otras cintas adhesivas

The adhesive bonding is today one of the most widespread techniques for advanced structures. Among the various types of adhesives, pressure sensitive adhesives (PSA) have a number of advantages such as a quick adhesion, easy application and a high level of impact strength and vibration damping. Within these PSA, the acrylic foam tapes are increasingly used to replace mechanical joints or adhesive in liquid or paste [1]. Applications of these tapes include sectors such as public transport vehicles, street furniture, architectural panels, etc., where their flexibility, energy damping properties, strength and toughness and sealing capabilities make them a good choice for semi-structural applications. [2,3]. In addition, they do not require curing, have a good resistance to UV radiation and long-term durability compared to other adhesives [4]. The objective of this study was to determine the effect of surface treatment of several acrylic double sided tapes under ageing conditions. Static, fatigue and impact strength were determined. The results showed that the primer provide a better behaviour after ageing cycles when these joints are tested under fatigue conditions. These results where also confirmed in the impact test.