Disrupting Fracture Toughness Of Adhesively Bonded Joints By Tailoring Composite Substrates

Conference paper (2024)

Authors

Rosemere de Araujo Alves Lima Group Teixeira De Freitas - Aerospace Engineering
R. Tao Group Dransfeld - Aerospace Engineering
S. Teixeira De Freitas Group Teixeira De Freitas - Aerospace Engineering
Research Group
Group Teixeira De Freitas (Aerospace Engineering) (TU Delft)
Tailoring Adhesive joints Toughening Stacking sequence Multi-damage
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Published Date

2024

Language

English

Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Group Teixeira De Freitas

Abstract

This work aims to improve the damage tolerance of secondary adhesively bonded joints under quasistatic mode I loading conditions by architecting the carbon fibre-reinforced polymer substrates’ stacking sequences [1]. Double Cantilever Beam tests show that architecting the stacking sequence of the laminates composite substrates in combination with the adhesive layer’s fracture toughness affects the crack onset and triggers different crack paths throughout the joints’ thickness. In specimens bonded with a low-toughness bi-component adhesive, the tailored design, including a co-cured toughening layer, could increase the effective fracture toughness of the composite bonded joints up to 200%. From this study, it was possible to recognise the complexity and benefits of moving from the traditional cohesive failure to outbreaking multiple crack path propagation.