Slow and intermittent stress relaxation of biomass granular media

Florent Thevenon (1, 2, 3) , Bharath Devulapalli (2) , Muriel Marchand (1) , Thierry Melkior (1) , Alain de Ryck (2)

1 UGA - Université Grenoble Alpes
2 RAPSODEE - Centre de recherche d'Albi en génie des procédés des solides divisés, de l'énergie et de l'environnement
3 ADEME - Agence de l'Environnement et de la Maîtrise de l'Energie

In the present work, the relaxation of several wood powders has been investigated in an annular shear cell. It is found that the slow logarithmic relaxation commonly observed for various materials including granular materials is interrupted by large events. Their frequency and amplitude are investigated with respect to particle size and stress-history by measuring stresses and strain. These large events during the relaxation appear to be controlled by the deformation. The coarser the particles are, the bigger is the deformation of the powder bed between two fast relaxation events and during the event.

Domaines: Sciences de l'ingénieur [physics]

Florent Thevenon, Bharath Devulapalli, Muriel Marchand, Thierry Melkior, Alain de Ryck. Slow and intermittent stress relaxation of biomass granular media. Powders & Grains 2021 – 9th International Conference on Micromechanics on Granular Media, Jul 2021, Buenos Aires (Online), Argentina. 4 p., ⟨10.1051/epjconf/202124908010⟩. ⟨hal-03309045⟩