G040054 Rate dependent strength of joints bonded with a double side pressure sensitive adhesive

Abstract

Adhesive bonding is now widely used in manufacturing portable electronic devices such as mobile phones. Recently, with the aim of improving efficiency of its manufacturing process, pressure sensitive adhesives (PSA) for the joints are taken notice instead of liquid adhesives. However, the strength of PSA bonded joint, especially under impact loading, has not been understood enough yet. The main scope of this study is to research the strength of PSA bonded joint under various loading rates. In these experiments, stress distribution in specimens is visualized using high speed polarization camera. These experimental results show that although the fracture toughness of PSA bonded joint increases with respect to loading velocity in slower rate range, it decreases in higher loading rate range because PSA becomes more brittle.