Characterisation of Fracture Process of Notched Glass Fiber/Aluminum Hybrid Laminates fay Acoustic Emission

摘要

Fiber metal laminates (FMLs) have been applied for aeronautical structures due to excellent characteristics in fatigue and impact strength in comparison to monolithic aluminum (Al) alloysfl]. The fracture process of FRPs [2-6] and metallic materials have often been investigated with the aid of acoustic emission(AE) techniques. However there are very few studies for AE characteristics in relation to fracture process of FMLs. Since the fracture behaviors have significant influences on the safety, reliability and integrity of FMLs, it is necessary to investigate the respective fracture processes in real time duiing load history. The present authors [4-5] investigated AE characteristics of continuous glass fiber leinforced plastic (GFRP) composites and proposed experimental models for AE characteristics in relation to the fracture process of GFRP. In this work, AE characteristics in association to fracture processes of single-edge-notched glass fiber/aluminum hybrid laminates (GFMLs) are examined according to different fiber ply orientations. Microscopic observation in the vicinity of crack tip and AE source location determined by signal arrival time are employed to examine the microfailure processes in the zone of fracture.