Acoustic emission study on tensile damage and failure behavior of fibre-reinforced aluminum alloy laminates with hole

Abstract

Real-time monitoring of the axial tensile damage process of GLARE laminates with hole was carried out by combining acoustic emission（AE）technology and digital image correlation（DIC）technology. The effect of hole size on the mechanical behavior and failure mechanism was further analyzed. The peak frequency（PF）range of different damage modes was determined based on the k-means method, and the characteristics of AE parameters such as amplitude（PA）, energy（E）, and cumulative impact number were used to clarify the tensile failure mechanism of GLARE laminates with hole. The results show that there were mainly four damage modes during the entire tensile process of GLARE laminates, namely metal layer damage, matrix cracking, fiber debonding and interface delamination, and fiber fracture. The occurrence of the four damage modes is sequential in time. The size of the hole had a significant impact on the bearing capacity of GLARE, and as the aperture increased, the specimen changed from sudden fracture to ductile fracture at the end of the failure stage.

Keywords

• glare laminates
• ae technology
• dic method
• cluster analysis
• failure mechanism