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Reference : UMR5521-LAUORG-002
Workplace : GRENOBLE
Date of publication : Friday, January 10, 2020
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 1 March 2020
Proportion of work : Full time
Remuneration : Between 2617 and 3017 euros/month
Desired level of education : PhD
Experience required : 1 to 4 years
Ordered fibrous materials are discrete and anisotropic architectures made of slender and deformable fibers. They are widely used for many applications: braided, knitted or woven synthetic or bio-based fibers used as reinforcements in composite materials for automotive, aeronautic, naval and sport industries, biocompatible and/or biodegradable textiles for biomaterials, scaffolds and other biomedical applications... Despite this ubiquity, the mechanical properties of these soft fibrous architectures are still poorly understood. These properties are inherited from complex fiber scale features such as the relative motion between fibers and the strong material and geometrical non-linearities related to the rheology of fibers and fiber-fiber contacts. Proposing suitable set of constitutive equations for the mechanics of these materials to optimize their achitectures requires fine scale experiments to better characterize the aforementionned fiber scale mechanisms. This is the main objective of the proposed postdoc project. For that purpose, mechanical tests will be carried out with ordered fibrous materials and 3D in situ observations of their microstructures using X-ray microstructures. With proper image analysis subroutine dedicated to fibrous media, (i) microstructure descriptors will be extracted and their evolutions during loading will be assessed, (ii) kinematical field measurements will be carried out at the fiber scale and will be compared with those obtained at the macroscale.
- Mechanical tests with 3D in situ observation using X-ray microtomography
- 3D image analysis for fibrous materials: microstructure descriptors and kinematical field measurements
PhD in mechanics of materials or materials science
Skills : experimental mechanics and 3D imaging
- X-ray tomography
- micromechanical tests with in situ observations
- image analysis
- kinematical field measurements
- The proposed offer is part of the French National Research Agency (ANR) project AMOC, "X-ray tomography and multiscale analyses for the optimisation of textile reinforcements for composites" (2019-2023), which involves 5 academic research laboratories: 3SR Lab (CNRS/Univ. Grenoble Alpes), LaMCoS (CNRS/Univ. Lyon) , LEM3 (CNRS/Univ. Lorraine), LMSSMat (CNRS/Univ. Paris Saclay), LPMT (Univ. Haute Alsace). The main objective of AMOC is to develop relevant constitutive equations for modeling the mechanical behvaiour of textiles and prepregs used for the fiber-reinforced composites of the automitive, aeronautic, naval and sport industries. The developped mechanical models will include the non-linear micromechanical behaviour of fibers and fiber-fiber contacts as well as the evolutions of the microstructures of the deformed fibrous networks, which will be characterized with X-ray microtomography.
- The postdoc poject will be located at 3SR Lab (Grenoble, France, https://3sr.univ-grenoble-alpes.fr/), a solid mechanics research lab of the CNRS and Univ. Grenoble Alpes. In particular, the experiments with 3D in situ observations will be performed with the 3SR Lab tomograph.
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