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Drilling of Fiber Metal Laminates for Aerospace Applications: Experimental Evaluation of Surface Treatment Effects on Adhesive Strength and Hole Quality

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Abstract:

Drilling of Fiber Metal Laminates (FMLs) is a very important manufacturing operation, as the metal-composite layered structure tends to undergo delamination, burrs, and dimensional errors. Although to date research work has mainly focused on cutting conditions, drilling tools, and lubrication methods for improved performance, the role of surface engineering on metal sheets prior to laminate fabrication has not received significant consideration. In this study, the effect of the variation of feed rate values during the drilling operation of FMLs with laser-textured titanium sheets is examined. Specifically, prior to FML consolidation, a unidirectional pattern with spacing characteristics of 200 µm was created on the titanium sheets; then, drilling tests using twist drill bits were carried out at a fixed cutting speed while varying the feed rate on two levels. The results show that a higher feed rate value induces both greater thrust force – and therefore improved adhesion resistance at the interface between the various materials of the multilayer – and a deterioration in the surface quality of the hole, increasing the occurrence of fiber pull-out and metal transfer phenomena.

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Periodical:

Defect and Diffusion Forum (Volume 450)

Pages:

111-118

DOI:

https://doi.org/10.4028/p-xY2PXd

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Cite this paper

Online since:

April 2026

Authors:

Agata Sposato, Maria Rosaria Saffioti*, Zheng Liu, Enrico Simonetto, Giovanna Rotella, Domenico Umbrello

Keywords:

Aerospace Structures, Drilling Performance, Fibre Metal Laminates (FMLs)

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Creative Commons CC BY 4.0

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* - Corresponding Author

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