|
 Home
> Directory
> .
> ANR FiLiGran
ANR-22-CE30-0012
FiLiGran: Mechanics of Fiber-interLinked Granular materials.
Members
Abstract
This project proposes to rationalize the behavior of fiber-reinforced granular media. Adding a small amount of flexible fibers to non-cohesive grains strongly modifies their mechanical response. Indeed, entanglement between flexible fibers and rigid grains causes a strong coupling that increases the material yield stress much above the confining pressure, induces a substantial resistance to traction and hinders extensional flows. Thus, the physics of granular materials added with fiber differs from the classical mechanics of granular media or fiber assemblies and requires the development of a new framework. To achieve this goal, we will realize a set of experiments to characterize the behavior of a model fiber-reinforced granular material under different solicitations. In a first step, we will study its mechanical response in compression and traction in the quasi-static limit and determine how the presence of fibers do affect the yield stress of this material. These experiments will be completed by visualizations allowing to track the deformation of fibers during the solicitation. In a second time, we will investigate the flowing behavior of a granular medium added with flexible fibers in a simple shear flow where the pressure is imposed. These results, associated to a dimensional analysis of the problem, will permit to propose a rheological formulation for fiber-reinforced granular materials. Thereafter, we will test the validity of this rheological law to describe the flowing behavior of this material in more realistic configurations. Finally, we will develop a theoretical modelization of the coupling between fibers and grains in order to complete our understanding of fiber-reinforced granular materials. This understanding will foster the development of fiber-reinforced techniques to realize sustainable infrastructures for civil engineering.
News
- May 2024: Johan Lorenzi is doing his Masters internship on the effect of fibres on granular avalanches.
- March 2024: Kennedy Nexion Chagua Encarnacion joins us as a postdoc to study the dispersion and organisation of flexible fibres into a granular medium.
- October 2023: Ladislas Wierzchalek starts his PhD on the Rheology and flows of fibre-reinforced granular materials.
- July 2023: We welcomed Simon Herbez from Paris-Saclay University for his licence intership on the study of a granular flow through a forest of flexible fibres.
- June 2023: Viktor Millet from Paris-Saclay University realizes his master internship on the intrusion into granular materials reinforced with fibres.
- February 2023: Karla Mella Pena, Isidora Pinilla and Sebastian Retamal from Universidad Tecnica Federico Santa Maria in Chile do their master internship on the collapse of a granular column reinforced with fibres.
Conferences
- Octobre 2024: Ladislas Wierzchalek presented his results on the rheology of grain-fibre mixtures at the conference organised by the Groupement Francais de Rheologie (GFR) in Marseille.
- September 2024: Ladislas Wierzchalek gave a presentation entitled in a talk "Rheology of a granular medium mixed with flexible fibers" at the 1st European Fluid Dynamics Conference (EFDC1) in Aachen, Germany.
- June 2024: Ladislas Wierzchalek presented his results on the characterization of grain-fibre mixtures with a vane rheometer at Journee Ecoulements et Fluides-Saclay.
- June 2024: Baptiste Darbois Texier gave a talk entitled "Flow of a granular material through a forest of obstacles" at the Annual European Rheology Conference (AERC) in Leeds.
- March 2024: Ladislas Wierzchalek presented a poster on "Rheology of a granular medium mixed with flexible fibers" at Rencontre du Non-Lineaire 2024 in Paris.
Publications
- December 2024: The article "Vane rheology of a fiber-reinforced granular material" by L. Wierzchalek, G. Gauthier and B. Darbois Texier has been submitted to Journal of Rheology.
|
|
