Binard, Sébastien
[UCL]
Philips, Lawrence
[UCL]
Macq, Benoît
[UCL]
Simar, Aude
[UCL]
Additive Manufacturing (AM) is increasingly used to manufacture industrial parts, that have to meet highly demanding requirements (e.g. fatigue resistance or tolerance ranges). However, since the AM technology is still on the rise, there is a high risk of producing dysfunctional or counterfeit parts, compared to business-as-usual manufacturing methods. In this context, watermarking appears as an efficient way to insert traceability informations into the part at manufacturing time, such as the manufacture date or the serial number of the AM machine. This will help to secure a promising technology from both the manufacturer’s and the customer’s perspectives. This Master Thesis introduces an innovative watermarking approach where the information is embedded at the part’s surface by partially double-lasing (i.e. partially remelting) the last layer using the Selective Laser Melting (SLM) process. As the last layer is remelted, which slightly improves the surface roughness, an interesting side benefit is the preservation (if not the enhancement) of the part’s fatigue resistance. Experimental tests were carried out using the AlSi10Mg alloy, commonly used in the aerospace sector, to (a) select the most appropriate scanning process for retrieving the hidden information, (b) validate the double-lasing process, (c) determine the optimal values of the double-lasing parameters, (d) measure the resulting fatigue resistance, and finally (e) assess the overall efficiency of the watermarking process.
Bibliographic reference |
Binard, Sébastien ; Philips, Lawrence. Watermarking for Additive Manufacturing copy control by roughness modification. Ecole polytechnique de Louvain, Université catholique de Louvain, 2018. Prom. : Macq, Benoît ; Simar, Aude. |
Permanent URL |
http://hdl.handle.net/2078.1/thesis:14620 |