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New insights into the effect of interparticle friction on the critical state friction angle of granular materials
https://orcid.org/0000-0002-9660-1737
Abstract This letter examines the effect of interparticle friction (μ) on the critical state friction angle (φ cs) of granular materials via the discrete element method. A series of drained triaxial tests are conducted on multisphere ellipsoids. The results indicate that φ cs first increases with μ and then reaches a plateau when μ ≥ 0.3. Anisotropic analysis provides new insights into the underlying mechanisms of the φ cs evolution from two perspectives. First, the initial increase of φ cs results from the increases of contact normal anisotropy a c, normal contact force anisotropy a n and tangential contact force anisotropy a t; subsequently, the saturation of φ cs is a consequence of the decrease of a n being compensated by the increase of a t. Second, the relationship between the stress ratio q/p and the contact normal anisotropy within the strong and nonsliding contacts is nearly linear for ellipsoids (i.e., q/p = ). Accordingly, the initial increase of φ cs is related to the increase of k and at low μ. The plateau of φ cs at high μ can be attributed to the decrease of being compensated by the increase of k.
New insights into the effect of interparticle friction on the critical state friction angle of granular materials
https://orcid.org/0000-0002-9660-1737
Abstract This letter examines the effect of interparticle friction (μ) on the critical state friction angle (φ cs) of granular materials via the discrete element method. A series of drained triaxial tests are conducted on multisphere ellipsoids. The results indicate that φ cs first increases with μ and then reaches a plateau when μ ≥ 0.3. Anisotropic analysis provides new insights into the underlying mechanisms of the φ cs evolution from two perspectives. First, the initial increase of φ cs results from the increases of contact normal anisotropy a c, normal contact force anisotropy a n and tangential contact force anisotropy a t; subsequently, the saturation of φ cs is a consequence of the decrease of a n being compensated by the increase of a t. Second, the relationship between the stress ratio q/p and the contact normal anisotropy within the strong and nonsliding contacts is nearly linear for ellipsoids (i.e., q/p = ). Accordingly, the initial increase of φ cs is related to the increase of k and at low μ. The plateau of φ cs at high μ can be attributed to the decrease of being compensated by the increase of k.
New insights into the effect of interparticle friction on the critical state friction angle of granular materials
https://orcid.org/0000-0002-9660-1737
Abstract This letter examines the effect of interparticle friction (μ) on the critical state friction angle (φ cs) of granular materials via the discrete element method. A series of drained triaxial tests are conducted on multisphere ellipsoids. The results indicate that φ cs first increases with μ and then reaches a plateau when μ ≥ 0.3. Anisotropic analysis provides new insights into the underlying mechanisms of the φ cs evolution from two perspectives. First, the initial increase of φ cs results from the increases of contact normal anisotropy a c, normal contact force anisotropy a n and tangential contact force anisotropy a t; subsequently, the saturation of φ cs is a consequence of the decrease of a n being compensated by the increase of a t. Second, the relationship between the stress ratio q/p and the contact normal anisotropy within the strong and nonsliding contacts is nearly linear for ellipsoids (i.e., q/p = ). Accordingly, the initial increase of φ cs is related to the increase of k and at low μ. The plateau of φ cs at high μ can be attributed to the decrease of being compensated by the increase of k.
New insights into the effect of interparticle friction on the critical state friction angle of granular materials
Gong, Jian (author) / Zou, Jinfeng (author) / Zhao, Lianheng (author) / Li, Liang (author) / Nie, Zhihong (author)
2019-05-18
Article (Journal)
Electronic Resource
English
A new interparticle friction apparatus for granular materials
| Online Contents | 2011
A new interparticle friction apparatus for granular materials
| British Library Online Contents | 2011