Dr. Anne-Françoise Obaton
Metrology for additive manufacturing, Laboratoire National de Métrologie et d'Essais, Paris, Île-de-France, France
Researcher in metrology for additive manufacturing
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Academic Career Length
21Years (2006-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications1 August 2017 in Heliyon
Journal Article
Anne-Françoise ObatonJFJ. Fain
J. Fain
MDM. Djemaï
M. Djemaï
DMD. Meinel
D. Meinel
FLF. Léonard
F. Léonard
GBG. Bruno
G. Bruno
+3
Several cylindrical specimens and dental implants, presenting diagonal lattice structures with different cell sizes (600, 900 and 1200 μm) were additively manufactured by selective laser melting process. Then they were implanted for two months in a sheep. After removal, they were studied by Archimedes' method as well as X-ray computed tomography in order to assess the penetration of bone into the lattice. We observed that the additive manufactured parts were geometrically conformed to the theoretical specifications. However, several particles were left adhering to the surface of the lattice, thereby partly or entirely obstructing the cells. Nevertheless, bone penetration was clearly visible. We conclude that the 900 μm lattice cell size is more favourable to bone penetration than the 1200 μm lattice cell size, as the bone penetration is 84% for 900 μm against 54% for 1200 μm cell structures. The lower bone penetration value for the 1200 μm lattice cell could possibly be attributed to the short residence time in the sheep. Our results lead to the conclusion that lattice implants additively manufactured by selective laser melting enable better bone integration.
7 January 2021 in Welding in the World
Journal Article
Anne-Françoise ObatonYWY. Wang
Y. Wang
BBB. Butsch
B. ButschQHQiang Huang
Qiang HuangAdditive manufacturing enables the fabrication of lattice structures which are of particular interest to fabricate medical implants and lightweight aerospace parts. Product integrity is critical in these applications. This requests very challenging quality control for such complex geometries, particularly on detecting internal defects. It is important not only to detect whether there are missing struts for a product with a large size of lattices, but also to identify the number of missing struts for safety-critical applications. Resonant ultrasound spectroscopy is a promising method for fast and cost-effective non-destructive testing of complex geometries but data analytics methods are needed to systematically analyze resonant ultrasound signals for defect identification and classification. This study utilizes resonant acoustic method to obtain resonant frequency spectrum of test lattice structures. In addition, regularized linear discriminant analysis, combined with adaptive sampling and normalization, is developed to classify the number of missing struts. The result shows 80.95% testing accuracy on validation study, which suggests that the resonant acoustic method combined with machine learning is a powerful tool to inspect lattices.
5 June 2018 in Welding in the World
Journal Article
Anne-Françoise ObatonMLM-Q. Lê
M-Q. Lê
VPV. Prezza
V. Prezza
DMD. Marlot
D. Marlot
PDP. Delvart
P. Delvart
CCC. Cayron
C. Cayron
+3
The assessment of the potential of various non-destructive methods to characterise additive manufactured dense and lattice parts was investigated. The Archimedes’ and gas pycnometric methods for density measurements of both types of structures are presented as well as the percentage of cells in lattice structures. A multi-frequency eddy current method for electrical conductivity measurements of lattice structures is also presented. Finally, C-scan ultrasound method for the characterisation of dense parts was investigated. The advantages and limitations of each method are underlined.
10 June 2020 in Welding in the World
Journal Article
Anne-Françoise ObatonBBB. Butsch
B. ButschECE. Carcreff
E. CarcreffNLN. Laroche
N. LarocheJTJ. Tarr
J. TarrADA. Donmez
A. DonmezJournal Article
Anne-Françoise ObatonJFJacques Fain
Jacques FainMDMeinel Dietmar
Meinel DietmarATAthanasios Tsamos
Athanasios TsamosFLFabien Léonard
Fabien LéonardMDMadjid Djemaï
Madjid Djemaï +1
The osseointegration in/around additively manufactured (AM) lattice structures of a new titanium alloy, Ti–19Nb–14Zr, was evaluated. Different lattices with increasingly high sidewalls gradually closing them were manufactured and implanted in sheep. After removal, the bone–interface implant (BII) and bone–implant contact (BIC) were studied from 3D X-ray computed tomography images. Measured BII of less than 10 µm and BIC of 95% are evidence of excellent osseointegration. Since AM naturally leads to a high-roughness surface finish, the wettability of the implant is increased. The new alloy possesses an increased affinity to the bone. The lattice provides crevices in which the biological tissue can jump in and cling. The combination of these factors is pushing ossification beyond its natural limits. Therefore, the quality and speed of the ossification and osseointegration in/around these Ti–19Nb–14Zr laterally closed lattice implants open the possibility of bone spline key of prostheses. This enables the stabilization of the implant into the bone while keeping the possibility of punctual hooks allowing the implant to be removed more easily if required. Thus, this new titanium alloy and such laterally closed lattice structures are appropriate candidates to be implemented in a new generation of implants.
30 March 2015 in Revue française de métrologie
Journal Article
Anne-Françoise ObatonABA. Bernard
A. Bernard
GTG. Taillandier
G. Taillandier
JMJ.-M. Moschetta
J.-M. Moschetta
About Me
Dr. habil. Anne-Françoise Obaton has been involved in metrology at the French National Metrology Institute (NMI): Laboratoire National de Métrologie et d'Essais (LNE) in Paris since 2000. Her research focused on optical metrology until December 2013, and then on metrology for additive manufacturing (AM) since January 2014. She is conducting research on the investigation and qualification of volumetric non-destructive testing (NDT) methods for quality assurance of AM parts. She is currently focusing on X-ray computed tomography (XCT) and resonant ultrasound spectroscopy (RUS).
Related to this topic, she has been staying abroad, as guest researcher, in several organisations (BAM and PTB in Germany, DTU in Denmark, and NIST and LLNL in US).
She is currently involved in—and has been involved in—several projects. She coordinated the European project JPR 15HLT09 MetAMMI (2015-2019): “Metrology for AM medical implants”.
Since 2014, she is involved in the international standardization ISO/TC261-ASTM/F42 group on AM, joint group JG59 on “NDT for AM parts”, where she leads the ongoing project: ISO/ASTM DIS 52971 AM-NDT&E-Guideline for dimensional measurements based on cone beam XCT".
In addition, since 2022, she is involved in ASTM E07.01 Radiology (X and Gamma) Method, specifically on XCT, and E07.06 Ultrasonic Method, specifically on RUS. In parallel, she is strongly involved in the XCT and AM working groups of the French Confederation for Non-destructive Testing (COFREND).