An experimental method to measure the strain field inside a granular material - Archive ouverte HAL Accéder directement au contenu
Vidéo Année : 2017

An experimental method to measure the strain field inside a granular material

Afficher 

Résumé

In many situations granular materials are highly stressed and undergo high plastic or hyper-elastic deformations: gauge fault, sintered powders, globules in veins... However, most of the experiments stay in the small deformation regime for theoretical convenience and are not able to properly catch the behaviour of these materials. By mean of a novel experimental approach we overcome the limitations of the photo-elastic method to measure local strain in highly deformed particles. We built an apparatus capable of compressing a densely packed set of 2D bidisperse discs made of silicone while imaging them very accurately after each loading step. This accurate imaging process permits first to follow precisely the evolution of the particle positions and geometries. Then a homemade Digital Image Correlation code catches the evolution of the displacement fields in each particle. All non-linear elasticity tensors (deformation, Cauchy-Green, strain...) are deduced and open a new field of experimental analysis for 2D granular matter as well as the opportunity to compute the stress tensor. We believe this new measurement method, not limited to a specific material, shape or loading mechanism opens a wide panel of new experimental possibility...

Dates et versions

medihal-01540230 , version 1 (16-06-2017)

Licence

Paternité - Pas d'utilisation commerciale

Identifiants

  • HAL Id : medihal-01540230 , version 1

Citer

Jonathan Barés, Thi-Lo Vu, Serge Mora. An experimental method to measure the strain field inside a granular material: application to highly compressed granular systems. 2017. ⟨medihal-01540230⟩
356 Consultations
17 Téléchargements

Partager

Gmail Facebook X LinkedIn More