Publications

Plate-forme, Type publication, TopicDateTopicTitre, Résumé, Lien Web
ENIT, ESTIA
Reviewed article
2019/09Material behaviour and durabilityEffects of WAAM Process Parameters on Metallurgical and Mechanical Properties of Ti-6Al-4V Deposits

Additive manufacturing is a revolution for many sectors of the industry. These new manufacturing processes allow a substantial saving of raw material while optimizing the geometry, and at the same time reducing development costs, by reducing the time between the concept and deployment phases of a product. A 3D printing device using a Cold Metal Transfer (CMT) arc welding station to melt a metallic filler wire is developed to build titanium parts by optimizing the process parameters to control metallurgical and mechanical properties of parts. In this study, two parameters (wire feed speed and movement speed of the robot) have been studied. Their impact on the metallurgical, dimensional process stability and mechanical properties of materials have been analyzed. Microstructure and mechanical properties vary depending on the energy expended during manufacture. This energy remains constant or decreases respectively when the wire feed speed or the robot head travel speed increases. Indeed, the electric generator adapts its power according to the speed of the wire. Regardless of the energy parameters, the movement speed of the robot seems to influence the wetting angles, the depth of melted zones, remelted and heat affected zones and the metallurgy with a refinement of the substructure of the deposits.

https://oatao.univ-toulouse.fr/25102
ENIT
Article en cours de rédaction
2020Design,
Heat Exchangers,
sCO2
CFD simulation to compare cooling efficiency of s-CO2 and Water in an optimized thermal cooling heat sink

The current study presents a CFD modeling to compare the heat sink efficiency to cool electronic components, using two different cooling fluids, water and super-critical CO2 (s-CO2). Over the past decades, studies have shown that s-CO2 has high potential to be used as cooling fluid in various applications due to its high thermal capacity in pseudo critical region. Fluent® R19 software is chosen for the simulation and both k-e and k-w turbulent models were used and their results compared. Results show that for the same geometry and heat flux, s-CO2 increases the heat sink overall efficiency compared to water. In addition, the total pressure drop is lower when using s-CO2, which leads to lower energy consumption in the system. It is also shown that the optimum design of the exchanger for s-CO2 should not be the same as for the water, particularly in terms of the size of the channels. Finally, prospects of further optimisation of the heat sink to increase the overall efficiency are discussed, particularly the optimisation of the diffuser’s geometry and structure.
ENIT
Article en cours de rédaction
2020Design,
Heat Echanger,
CFD topological optimization
Topological optimization of an inlet heat exchanger for additive manufacturing, and comparizon of 3 methods.
ENIT
Submitted article
2020Design (DfAM),
Machining
A new method of Design for Additive Manufacturing (DfAM) including topology optimization and machining constraints: An aeronautical based case study.

Metal additive manufacturing is a major field of study and innovation. In the aeronautical industry a lot of effort goes into modelizing and optimizing designs in order to minimize global mass. In this context, despite all efforts, metal additive manufacturing (especially SLM) still produces parts generally considered as raw parts with some surfaces still needing to be machined in order to obtain the required geometrical quality. Despite sometimes, great complexity and cost, the machining stage is never taken into account in the design process, especially during the topological optimization approach.
This paper proposes a new design for the Additive Manufacturing (DFAM) method in order to optimize the design stage and takes into account topological optimization machining as well as geometrical and mechanical constraints.
It is shown on a typical aeronautical part that machining forces may be the greatest forces during the part’s life-time. Using two different topological optimization software (Inspire / Abaqus Tosca) the paper illustrate that it is possible to take into account most of the machining constraints to only slightly modify the initial design and thus simplify the machining stage and reduce cost and possible failure during machining.
ENIT
Article en cours de rédaction
2020Metamaterial optimizationOptimization of the machining of metallic additive manufacturing (SLM) supports, first methodological approach.
ENIT,
Conference
2020/03
Material behaviour and durabilityDirect heat sink printing on metallized ceramic substrate for power electronics applications: heat treatment identification and its impacts.

https://www.researchgate.net/publication/341822901
ENIT2018/12Process modellingKnowledge-Based Design of Artificial Neural Network Topology for Additive Manufacturing Process Modeling: A New Approach and Case Study for Fused Deposition Modeling

http://www.sfu.ca/~gwa5/pdf/2019_04.pdf
IRT, ENIT
Collaborative project
2019Material behaviour and durabilityMetalTechnics,
Development of high performances metallic materials for aeronautical and space applications.
Partners: IRT, Aubert, Duval, Exova, PMG, FUSIA, COSTELLIUM, ENSMA, TOMOADOUR, TIMET, 3A, THALES, AIRBUS FUI ADDIMAFIL.
ESTIA, ENIT
Collaborative project
2020Process developpement, Material behaviour and durabilityADDIMAFIL
IRT, ENIT
Collaborative project
2020Material behaviour and durabilityAnDDurO
ENIT
PhD
2020>22Material behaviour and durabilityCollins collaboration
ENIT
PhD
2019>21Process modellingHalbronn 3D collaboration
ENIT
PhD
2018>20Process modelling, machiningMecapole collaboration
ENIT
R&D projects
2017>20Material behaviour, DesignALSTOM collaboration
ENIT
R&D projects
2017>20DesignTOTAL collaboration
ESTIA, ENIT
Collaborative project
2018Process developpementAddiTool :
Laser cladding new technologies for hotforming tooling
IRT
Reviewed article
2018/07Material behaviour and durabilityInfluence of Microstructure and Surface Roughness on Oxidation Kinetics at 500–600 °C of Ti–6Al–4V Alloy Fabricated by Additive Manufacturing.

https://link.springer.com/content/pdf/10.1007/s11085-018-9859-0.pdf
IRT, I2M
Reviewed article
2020/03Material behaviour and durabilityInvestigation of the sensitivity of the fatigue resistance to defect position in aluminium alloys obtained by selective laser melting using artificial defects

https://doi.org/10.1016/j.ijfatigue.2020.105505
IRT
rRviewed article
2020/01Material behaviour and durabilityInfluence of manufacturing orientations on the morphology of alloy 718 single struts manufactured by selective laser melting

https://doi.org/10.1002/mdp2.140
IRT
reviewed article
2019/04Material behaviour and durabilityIdentification of relationships between heat treatment and fatigue crack growth of αβ titanium alloys.

https://www.mdpi.com/2075-4701/9/5/512
IRT
Oral presentation
2018/05Process modellingDiscrete element method to study the powder-bed distribution and density in selective laser manufacturing

IRT, I2M
Oral presentation
2019/06Material behaviour and durabilityDefect sensitivity in additively manufactured aluminium alloys: contribution of CAD artificial defects

https://doi.org/10.1051/matecconf/201930003006
IRT
Oral presentation
2019/04Process developpementBanc expérimental pour l’analyse in-situ autour du procédé de fusion par laser lit de poudre

https://s-mart2019.event.univ-lorraine.fr/file/513592