Ms. Sylwia Rzepa Profile

Sylwia Rzepa

at Comtes FHT

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Proceedings Article | 17 March 2023 Presentation + Paper

Forming of metal sheets textured by LIPSS

G. Mincuzzi, Sylwia Rzepa, Sergi Parareda Oriol, A. Bourtereau, L. Gemini, M. Faucon, R. Kling

Proceedings Volume 12409, 124090R (2023) https://doi.org/10.1117/12.2649763

KEYWORDS: Scanning electron microscopy, Polygon scanners, Metals, Pulsed laser operation, Laser applications, Engineering, Ultrafast phenomena, Polymers

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Use of kW class Ultra-Short Pulse lasers jointly with a suitable beam engineering strategy makes possible to achieve highthroughput production of laser functionalised surfaces. Nonetheless, the production of complex parts is still limited by several issues like the difficulty to reach certain regions where the geometry presents high aspect ratio shapes or tortuous profiles, and the need to adapt the laser processing workstation to a specific geometry. To overcome this issue, metallic moulds can be efficiently laser treated and employed to reproduce the surface morphology, and its specific properties, on a final polymeric replica. Forming process is a well-known method to produce any-shape part from metallic foils by applying specific constraints. In this work, forming of laser-treated metallic foils and the mechanical properties of the final formed functionalised parts are investigated in order to evaluate the possibility to produce laser-functionalised 3D complex products. By using a Rollto- Roll pilot line we textured stainless-steel 200 μm-thick foils by Laser Induced Periodic Surface Structures (LIPSS). The LIPSS morphology has been firstly optimised. Then, three types of mechanical tests were carried on laser-treated and untreated foils: standard tensile, fatigue and cruciform specimen tests. We measured and compared ultimate tensile strength, breaking strength, maximum elongation, and area reduction on specimens with and without LIPSS obtained from the same foil. By SEM and AFM analysis we compared the LIPSS morphology on samples subjected to mechanical tests and those just textured. For both, we evaluated the surface wettability through a measurement of the contact angle.

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