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Mixed-Mode Fracture of Adhesively Bonded CF/Epoxy Composite Joints

Centre for Advanced Materials Technology (CAMT), Department of Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia

Lin Ye

Centre for Advanced Materials Technology (CAMT), Department of Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia

Yiu-Wing Mai

Centre for Advanced Materials Technology (CAMT), Department of Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia

Mixed-mode fracture behaviour of adhesively bonded CF/Epoxy composite joints was studied using a rubber-modified epoxy (Araldite® GY260) as the adhesive. Fixed-ratio mixed-mode specimens (G_I/G_II = 4/3) were applied in the experiments. Composite adherends were manufactured from carbon fibre/epoxy (5128 T300 BASF) prepreg. The global mixed-mode fracture energy, G_c, of the joints with different bond thickness, t, was evaluated using compliance calibration obtained from the experiments, beam theory and finite element analysis. The crack path along the bond line in the adhesive joints was investigated using optical microscopy. It was found that G_c, was dependent on both the bond thickness and the actual crack path in the joints. G_c, increased mildly from thin bonds (t < 100 µm) to a plateau value for larger bond thickness (t > 100 Am). For poor bonding between the adhesive and the composite adherends, interfacial crack propagation was observed for very thin bonds with alternating crack jumping from one interface to another across the bond line. The crack propagated almost at one interface for large bonds with occasional kinking. However, for strong interfacial bonding, the crack was deviated from the mode-I precrack towards the composite adherend and propagated cohesively in the composite layer. Scanning electron microscopy on the fracture surfaces showed different morphology depending on the interfacial bonding between the adhesive and the composite adherend.

Key Words: adhesive joints • mixed-mode fracture • carbon fibre/epoxy composite • bond thickness • strain energy release rate • rubber-modified epoxy

Journal of Composite Materials, Vol. 30, No. 11, 1248-1265 (1996)
DOI: 10.1177/002199839603001104


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