24 Oct 2023Job Information
Physics » Computational physics
Physics » Optics
First Stage Researcher (R1)
8 Jul 2024 - 18:00 (Europe/Paris)
Type of Contract
Hours Per Week
Offer Starting Date
3 Jan 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?
Replacing aluminum by carbon fiber composites (CFRP) in the aeronautic industry is a research effort towards sustainable aviation. But compared to aluminium, CFRP have lower thermal and electrical conductivities and a sheet-like structure, meaning that there is a larger risk of thermo-mechanical damage if lightning strikes occur. A better understanding of the physical phenomena leading to this type of damage would enable aircraft manufacturers to make a reliable assessment of the type of lightning protection they need to put in place to further optimize aircraft weight and materials management.
In situ investigation of materials requires the use of X-rays. However, images of CFRP, which are light materials, have low contrast if the imaging method is based solely on X-rays absorption (absorption contrast imaging or radiography). ONERA and CEA are therefore developing innovative imaging methods that also exploit X-rays deflection (phase contrast imaging or XPCI). The related imaging bench has recently provided tangible results to characterize the core damage of CFRP stricken on the ONERA lightning test bench (post-mortem analysis). These results have aroused strong industrial interest and led to the award of an ANR research grant.
In this thesis, you will use the XPCI numerical simulation tools of CEA and material damage tools of ONERA to develop a predictive imaging method for CFRP impacted by lightning. These simulations will be compared with experimental images to help in the interpretation and analysis of damage. Developments will be guided by the long-term objective of dynamically imaging CFRP damage during lightning strikes on ONERA's lightning test bench.
This thesis is funded by the ANR DyXPLAY project (2024-2028). To carry out the work, you will join the “Lightning, Plasmas and Application” team of ONERA, which has a long expertise in the physics of lightning. The team pursues modelling and experimental studies to understand the lightning arc interaction with aeronautical structures. You will be supervised by A. Jarnac, who has initiated the development of high-speed X-ray diagnostics at ONERA and has extensive experience of synchrotrons. You will have access to static XPCI bench of CEA and participate in experimental runs in synchrotron in the framework of the Shock BAG at ESRF 7 to verify the validity of your numerical developments. The doctoral project will be led by A. Stolidi from CEA List (Saclay) who develops innovative X-ray diagnostics for non- destructive testing and J. Primot from the Optics and Associated Technics Department (DOTA, ONERA Palaiseau), who is behind the development of advanced phase measurement methods.
1 L. Chemartin et al., Direct Effects of Lightning on Aircraft Structure: Analysis of the Thermal, Electrical and Mechanical Constraints, AerospaceLab, p. 1-15 (2012)
2 R. Sousa Martins, Etude expérimentale et théorique d'un arc de foudre et son interaction avec un matériau aéronautique, Thèse Université Paris-Saclay (2016).
3 A. Momose, Recent Advances in X-ray Phase Imaging, Jpn. J. Appl. Phys. 44, 6355 (2005)
4 A. Stolidi et al., "Confidence map tool for gradient-based X-ray phase contrast imaging." Optics Express 30, 4302 (2022)
5 G. Giakoumakis et al., "Artifacts reduction in high-acutance phase images for X-ray grating interferometry." Optics Express 30, 41147 (2022)
6 A. Stolidi et al., “X-ray phase contrast imaging model: application on tomography with a single 2D phase grating”, 11th Conference on Industrial Computed Tomography, Wels, Austria (iCT 2022)
7 https: // www. esrf.fr/BAG/MI1397Requirements
Master Degree or equivalent
Profile and skills required: The student must have:
At the end of the thesis, the student will have developed skills in:
Number of offers available
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GeofieldWhere to apply
https: // www. onera.fr
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