Quasistatic response of loose cohesive granular materials - Archive ouverte HAL
Communication Dans Un Congrès Année : 2021

Quasistatic response of loose cohesive granular materials

Résumé

DEM-simulated model cohesive assemblies of spherical grains of diameter d , with contact tensile strength F 0 , once prepared in loose states, are quasistatically subjected to growing isotropic pressure P , and then to triaxial compression, maintaining lateral stresses σ 2 = σ 3 = P while increasing axial stress σ 1 = P + q and strain є 1 . Reduced pressure P * = d 2 P/ F 0 varies from 0.1 (cohesion dominated case, for which systems typically equilibrate with solid fraction Ф ≃ 0.35), to large values for which the cohesionless behavior is retrieved. In triaxial compression, while the moderate strain response (є 1 ~ 0.1) is influenced by initial coordination numbers and mesoscale heterogeneities, the approach to the critical state, as both q (deviator) and Ф steadily increase, gets slower for smaller P * . Critical ratio q /P strongly increases for decreasing P * , as roughly predicted in an “effective stress” scheme. Anomalously small elastic moduli are observed in the gel-like structures. While extensive geometric rearrangements take place, no shear banding is observed. Loose cohesive granular assemblies are thus capable of large quasistatic stable plastic strains and ductile rupture.
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Dates et versions

hal-04318643 , version 1 (01-12-2023)

Identifiants

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Walid Lammali, Jean-Noël Roux, Anh-Minh Tang. Quasistatic response of loose cohesive granular materials. Powders and Grains 2021- – 9th International Conference on Micromechanics on Granular Media, Association pour l'Étude de la MIcromécanique des Milieux Granulaires, Jul 2021, Santa Rosa de la Pampa (virtual), Argentina. pp.14021, ⟨10.1051/epjconf/202124914021⟩. ⟨hal-04318643⟩
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