Advanced explicit schemes and mesh superposition to accelerate Additive Manufacturing simulations

10 Mar 2024
Job Information

Organisation/Company

Université deBordeaux - Laboratoire I2M

Research Field

Computer science » Digital systems
Engineering

Researcher Profile

Recognised Researcher (R2)
Leading Researcher (R4)
First Stage Researcher (R1)
Established Researcher (R3)

Country

France

Application Deadline

31 May 2024 - 22:00 (UTC)

Type of Contract

Temporary

Job Status

Full-time

Offer Starting Date

1 Sep 2024

Is the job funded through the EU Research Framework Programme?

Not funded by an EU programme

Is the Job related to staff position within a Research Infrastructure?

No

Offer Description

 

 

Additive Manufacturing (AM) processes such as Laser Beam Melting (LBM) present undeniable advantages compared to conventional processes: the ability to create complex shapes, functionalize components, reduce material usage, repair existing parts or generate multi-material structures. Despite these strengths, LBM is hindered by defects such as residual stresses and geometric distortions, limiting its widespread adoption. To minimize these drawbacks, a costly trial-and-error phase is often necessary to find the right set of manufacturing parameters (e.g., laser power, scanning strategy, laser speed or hatch distance). It is in this context that numerical simulation becomes crucial, aiming to quickly find the optimal manufacturing parameters.

 

Current thermal simulations of the LBM process face excessively long computation times, demanding days to compute laser paths of a few centimetres whereas industrial components consist of laser paths spanning several kilometres. We recently demonstrated that the forward Euler scheme was much more efficient than the usually employed implicit schemes to model LBM (cf. 10.1016/j.finel.2022.103825 ).

 

 The project takes this approach further by exploring two additional aspects to accelerate finite element thermal simulations: the use of super-time-stepping (STS)  explicit schemes and the adoption of a mesh superposition technique: the s-FEM . This numerical strategy should give rise to the fastest scheme available to date to model LBM as well as other AM processes.

 

 

We are looking for a highly-motivated PhD candidate to help us achieve the above goal. The subject will entirely focus on numerical developments made in an in-house code developed by one of the PhD supervisors (me!). Both the STS and the s-FEM are already part of our code. We look for candidates willing to deeply understand and further develop these methods to make them fit the LBM process. We are seeking students with a strong background in numerical methods and/or applied mathematics and/or computational thermomechanics and/or scientific programming. Candidates who have a basic understanding of these areas but are eager to become experts in the field are encouraged to apply.

 

Collaborations with an industrial partner located near Bordeaux (Safran Addivite Manufacturing Campus) are possible. Teaching at University of Bordeaux is also possible.

Funding category: Contrat doctoral
2200 eurs brut/mois
PHD title: Doctorat
PHD Country: France

Requirements
Specific Requirements

rigoureux, curieux, enthousiaste, intéressé par la programmation scientifique, la simulation numérique et la fabrication additive

Additional Information
Work Location(s)

Number of offers available

1

Company/Institute

Université deBordeaux - Laboratoire I2M

Country

France

City

talence

Geofield

Where to apply

Website

https://www.abg.asso.fr/fr/candidatOffres/show/id_offre/121035

Contact

Website

https://www.i2m.u-bordeaux.fr/L-institut-UMR-5295

STATUS: EXPIRED