Experimental and numerical investigation of mesoscopic damage accumulation in adhesively bonded composite scarf joints
Sota Oshima, Satoshi KOBAYASHI
Abstract
Mesoscopic damage accumulation in adhesively bonded composite scarf joints until final failure was investigated for a comprehensive understanding of the damage and failure processes. The damage accumulation in scarf joints with different scarf angles and stacking sequences was characterized by several in situ techniques, such as optical microscopy, high-speed photography, and acoustic emission testing . In addition, progressive damage analysis was carried out to understand the stress state depending on damage using the finite element method with stress triaxiality-dependent yield and damage models. Transverse cracks appeared in composite adherends because of local stress concentration near the end of the 0°layers. The final failure was triggered by the interfacial crack growth between the 0°and 90°layers initiated from the transverse cracks. Numerical simulation results showed that the presence of transverse cracks largely affects the stress distribution in the adhesive layer .