PSI - Issue 53

R.D.F.S. Costa et al. / Procedia Structural Integrity 53 (2024) 376–385 Costa, R. D. F. S./ Structural Integrity Procedia 00 (2023) 000 – 000

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4. Conclusions To conclude, a very diversified set of parameters was tested in the drilling of these specific multi-materials (CFRP/Al/CFRP and Al/CFRP/Al) and several approaches were used to analyse the performed experiments to the drilled holes during the campaigns. From this, it is possible to highlight the higher cutting forces achieved in the aluminium layers in comparison to the CFRP ones, confirming the latter’s relative brittleness. The delamination area increased with the increment of drilling parameters, especially feed rate, and severe burr defects were observed in multi-material type II with drill 1, but were optimized with drill 2. In spite of this, uncut fibres of the inner composite layer were still present in some holes despite the optimization. CFRP powdered chips were observed, while aluminium chips had long and non-fragmented geometry. No significant wear was noticed overall, with just a small abrasion on the drill’s side for multi - material type I and an observation of aluminium adhesion on the drill’s flank for type II. Acknowledgements The authors gratefully acknowledge the funding from Project Hi-rEV – Recuperação do Setor de Componentes Automóveis (C644864375-00000002), cofinanced by Plano de Recuperação e Resiliência (PRR), República Portuguesa, through NextGeneration EU. References Costa, R. D. F. S., Jesus, A. M. P., Simões, S. L. S., & Barbosa, M. L. S. (2023). Advanced Characterization Techniques of Multi-material Machining Tool Coatings. Lecture Notes in Mechanical Engineering , 248 – 256. https://doi.org/10.1007/978-3-031-38241-3_28 Costa, Rúben D.F.S., Sales-Contini, R. C. M., Silva, F. J. G., Sebbe, N., & Jesus, A. M. P. (2023). A Critical Review on Fiber Metal Laminates (FML): From Manufacturing to Sustainable Processing. 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