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

Journal article (2021)

Authors

M. Moreira Arouche Federal Center of Technological Education Celso Suckow da Fonseca-CEFET/RJ, Structural Integrity & Composites - Aerospace Engineering
S. Teixeira De Freitas Structural Integrity & Composites - Aerospace Engineering
Silvio de Barros UMR 6183 CNRS, Federal Center of Technological Education Celso Suckow da Fonseca-CEFET/RJ
Research Group
Structural Integrity & Composites (Aerospace Engineering) (TU Delft)
Copyright: © 2021 M. Moreira Arouche, S. Teixeira De Freitas, Silvio de Barros
DOI: https://doi.org/10.1016/j.compstruct.2020.113109
Surface roughness Fractography Toughening mechanism Bi-material bonded joints Mixed-mode bending (MMB)
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Published Date

2021

Language

English

Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Structural Integrity & Composites

Abstract

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.