28 Feb 2024
Job Information
- Organisation/Company
CNRS- Department
Institut de Recherche en Génie Civil et Mécanique- Research Field
Engineering » Materials engineering
Physics » Acoustics- Researcher Profile
First Stage Researcher (R1)- Country
France- Application Deadline
19 Mar 2024 - 23:59 (UTC)- Type of Contract
Temporary- Job Status
Full-time- Hours Per Week
35- Offer Starting Date
1 May 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
Reliable fatigue crack propagation models are essential in all industries where fatigue cracks are a major concern for safety reasons, such as in the energy and transportation sectors. Fatigue life predictions for these components are often based on crack propagation calculations, with initiation accounting for a negligible portion of the life. However, structural components, e.g. in aeronautical, railway or automotive applications, are inevitably subjected to fatigue under varying load magnitudes. Even when components are designed for constant amplitude loading, the occurrence of overloads or underloads in service is frequent and affects the rate of fatigue crack propagation. In most metal alloys, a few cycles of crack acceleration followed by deceleration are observed after an overload.
The goal of the ANR ADVENTURE project (dAta DriVEn iNvestigation of faTigUe cRack growth with ovErload effects) is to better understand the effects of overloading on established cracks but also on small 3d cracks during the transitions between initiation and propagation.
In the framework of the ANR-ADVENTURE project, a 1 year post-doc contract is open at GeM. The candidate will focus on simplified numerical modeling of fatigue propagation, but taking into account the effects of overload. In the envisaged strategy, higher order terms of the asymptotic development of the elastic solution at the crack tip will be accounted for in order to estimate the size of the plastic zone at the crack tip. This size of the plastic zone will then be used to correct the propagation speed thanks to a model in the spirit of Wheeler's model [1], [2]. The model will be based on rich experimental data obtained from full 3D displacement fields measurements using X-ray tomographies acquired during in-situ experiments.
[1] Wheeler OE. Spectrum loading and crack growth. J Basic Eng, Trans ASME 1972;94(1):181–6.
[2]B.K.C. Yuen, F. Taheri. Proposed modifications to the Wheeler retardation model for multiple overloading fatigue life prediction I.J.F 28 (2006) 1803–1819
The post-doctoral fellow shall contribute to :
- experimental data analysis
- data-driven stress reconstruction
- plastic activity crack growth relationship
- definition of modeling features
- implementation and validation
The open position is part of the ANR ADVENTURE project in which 4 partners are involved. Three academic research labs are in the project: LaMCube (UMR9013), MATEIS (UMR5510) and GeM (UMR6183). The CETIF is also involved as an industrial partner.
Requirements
- Research Field
- Engineering
- Education Level
- PhD or equivalent
- Research Field
- Physics
- Education Level
- PhD or equivalent
- Languages
- FRENCH
- Level
- Basic
- Research Field
- Engineering » Materials engineering
- Years of Research Experience
- None
- Research Field
- Physics » Acoustics
- Years of Research Experience
- None
Additional Information
Eligibility criteria
Candidates must hold a PhD thesis in numerical simulation and/or fracture mechanics. They should have experience in numerical implementation of finite element models. A combination with skills in fracture mechanics will be greatly appreciated. Basic knowledge in experimental analysis and full-field measurements techniques will also be considered as an important skill.
Candidates must have a very positive attitude to working in a team. Finally, fluency in spoken and written English is a requirement.
- Website for additional job details
https://emploi.cnrs.fr/Offres/CDD/UMR6183-CANMER-005/Default.aspx
Work Location(s)
- Number of offers available
- 1
- Company/Institute
- Institut de Recherche en Génie Civil et Mécanique
- Country
- France
- City
- NANTES
- Geofield
Where to apply
- Website
https://emploi.cnrs.fr/Candidat/Offre/UMR6183-CANMER-005/Candidater.aspx
Contact
- City
NANTES- Website
http://gem.ec-nantes.fr
STATUS: EXPIRED