> THEO ANDRIEUX

Ph.D. Student, LMS – École Polytechnique

Machine learning & fast simulation for metal additive manufacturing

Linking laser process parameters to the microstructure and properties of printed metal parts, with physics-based models fast enough for the factory floor.

CV

> NEWS

> ABOUT

Photo of Théo Andrieux

Hi, I'm Théo, a Ph.D. student at the Solid Mechanics Laboratory (LMS) of École Polytechnique, supervised by Manas V. Upadhyay and Daniel Weisz-Patrault. My thesis aims at rapidly identifying the relationship between laser processing parameters, microstructure and mechanical properties in metal additive manufacturing, by combining in situ experiments in a laser-equipped electron microscope, fast physics-based simulation and machine learning.

I am an engineer from École Polytechnique, specialised in Mechanics and Materials at Mines Paris. During my studies I did engineering internships at ArianeGroup (dynamic characterisation of the Ariane 6 launcher), Withings (polymer durability for connected health devices) and Aerophile (CFD). They taught me that a model is only useful if it is validated, fast, and answers a question someone building parts actually has.

I am always happy to discuss exciting topics in laser processing and additive manufacturing, with researchers, engineers and companies. Get in touch.

> PUBLICATIONS

> FEATURED PROJECTS

Temperature field of a laser scan: spectral Galerkin solver ahead of the finite element reference

SPECTRAL GALERKIN SOLVER

2025 – 2026 · Ph.D. research · open source

A laser-scan simulation that took 189 hours with finite elements now runs in 50 minutes on a GPU.

> read more
X-Rocket experimental rocket

X-ROCKET

2022 – 2023 · Technical lead

A rocket meant to land by autorotation instead of a parachute. It flew at C'Space 2023; the rotor only partly opened.

> read more
Formula Student chassis CAD model

FORMULA STUDENT CHASSIS

2023 – 2024 · Chassis team lead, IP Paris Racing Team

Parametric optimisation of a tubular spaceframe: +47% torsional stiffness, 1.6 kg lighter.

> read more
Piezoelectric energy harvester prototype

PIEZO ENERGY HARVESTER

2020 – 2021 · CPGE research project (TIPE)

A piezo beam that retunes its own resonance to follow the vibration. Solo project.

> read more

> EXPERIENCE

  • Oct 2025 – present

    ResearchPh.D. Student, Solid Mechanics

    LMS, École Polytechnique

    Fast thermal simulation and machine learning to link laser parameters, microstructure and mechanical properties in metal additive manufacturing.

  • Sep 2026 – present

    TeachingTeaching Assistant, Mechanics

    École Polytechnique

    Mechanics Lab (PHY203): supervising lab sessions and grading lab reports. Continuum Mechanics (MEC430): tutorials.

  • Mar 2025 – Aug 2025

    IndustryMechanical Development Engineer Intern

    Withings · 6 months

    Experimental and numerical evaluation of the mechanical response of polymers to water absorption and temperature variations.

  • Mar 2024 – Aug 2024

    IndustryStructural Dynamics Engineering Intern

    ArianeGroup · 6 months

    Developed dynamic characterisation software for the Ariane 6 launcher (MATLAB, PERMAS); reduced vibration models by transfer-function coupling.

  • Sep 2022 – Jun 2025

    TeachingOral Examiner (Colleur), Preparatory Classes

    Lycée Lakanal · 3 years

    Teaching and examining Engineering Sciences for PSI and PCSI students.

  • Jun 2023 – Aug 2023

    IndustryNumerical Simulation Intern

    Aerophile SAS · 3 months

    Fluid–structure modelling of a tethered balloon; airflow modelling of fine-particle pollution with ANSYS Fluent.

  • Oct 2021 – Mar 2022

    IndustryProtocol Team Assistant

    COFREX, France Pavilion, Expo 2020 Dubai · 6 months

    Protocol team of the France Pavilion: about 500 official and business delegations from 90 countries welcomed over six months.

> EDUCATION

  • 2025 – 2028

    Ph.D. in Solid Mechanics

    École Polytechnique, LMS

    Rapid identification of laser processing–microstructure–properties relationship: an experiment–machine learning synergistic approach. Supervisors: Manas V. Upadhyay and Daniel Weisz-Patrault.

  • 2024 – 2026

    Engineering Degree, Mechanics and Materials

    Mines Paris – PSL (MécaMat track)

  • 2021 – 2025

    Engineering Degree (Ingénieur polytechnicien)

    École Polytechnique

    MSc in Engineering Sciences, specialisation in Mechanics.

  • 2019 – 2021

    Preparatory Classes (CPGE PT*)

    Lycée Jules Ferry, Versailles

> AWARDS & SKILLS

Awards

  • Innovation Award, Engineering Sciences Olympiads, Paris (2019) · AI that transcribes piano music into sheet music
  • Third Prize, Engineering Sciences Olympiads (2019) · bionic robotic arm to assist people with disabilities

Tools

  • Programming · Python (NumPy, SciPy, CuPy, ML), MATLAB, Java
  • Simulation · finite elements, spectral methods, ANSYS Fluent, PERMAS
  • CAD & making · CATIA, Fusion 360, Onshape, 3D printing, machining

Languages

  • French · native
  • English · fluent (C1)
  • German · fluent
  • Arabic · beginner

> OUTSIDE THE LAB

I have had a 3D printer at home for more than ten years. I have upgraded it, broken it and repaired it many times, and printed parts for almost everything around me. Somewhere along the way, printing stopped being only a hobby: my Ph.D. is now on metal additive manufacturing.

I still design models for fun and share them on Cults3D.

My designs on Cults3D