On the influence of glass fiber mat on the mixed-mode fracture of composite-to-metal bonded joints

On the influence of glass fiber mat on the mixed-mode fracture of composite-to-metal bonded joints

Moreira Arouche, M. (TU Delft Structural Integrity & Composites; Federal Center of Technological Education Celso Suckow da Fonseca-CEFET/RJ)
Teixeira De Freitas, S. (TU Delft Structural Integrity & Composites)
de Barros, Silvio (Federal Center of Technological Education Celso Suckow da Fonseca-CEFET/RJ; UMR 6183 CNRS)

2021

In this work, the influence of a layer of glass fiber mat (GFM) inserted in a bi-material bonded joint interface is investigated as a toughening mechanism to improve the fracture performance of bonded structures. Composite-to-metal bonded specimens were manufactured by hand lay-up using two different consolidation processes: at room pressure or using vacuum bagging. The fracture behavior was evaluated under quasi-static loadings using the mixed-mode bending (MMB) test. Test results revealed an increase of the fracture toughness with the insertion of an adjacent layer of GFM. The toughening mechanism is associated with a more irregular fracture surface profile. It was verified a relationship between the fracture surface roughness and the fracture toughness. The toughening effect showed to be more evident in higher mode II fracture conditions. The insertion of a layer of GFM and the use of vacuum pressure in the consolidation of the composite increase the fracture performance of composite repairs in metal structures.

Bi-material bonded joints
Fractography
Mixed-mode bending (MMB)
Surface roughness
Toughening mechanism

http://resolver.tudelft.nl/uuid:59893187-c214-4657-adb5-41daf2471d1e

https://doi.org/10.1016/j.compstruct.2020.113109

0263-8223

Composite Structures, 256

Institutional Repository

journal article

© 2021 M. Moreira Arouche, S. Teixeira De Freitas, Silvio de Barros