Effect of test temperature on the tensile strength and fatigue strength of epoxy adhesive joints

Abstract

A double lap joint was fabricated using an epoxy adhesive and an aluminum plate, and its high-temperature strength properties were investigated. Tensile and cyclic fatigue tests were performed at test temperatures from -55°C to 135°C. The relationship between test temperature and strength could be expressed using equations derived from thermal activation theory. However, the high-temperature fatigue test changed the molecular structure of the adhesive, resulting in a significant decrease in strength.