Shear-induced pressure anisotropy in granular materials of nonspherical particles
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912759735648256 |
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| author | Rahim, Huzaif Roy, Sudeshna Pöschel, Thorsten |
| author_facet | Rahim, Huzaif Roy, Sudeshna Pöschel, Thorsten |
| contents | When a granular material composed of elongated grains is sheared in a split-bottom shear cell, a pressure difference develops within the material. This pressure difference depends on the interparticle friction ($μ$), which affects shear localization and particle alignment. For large $μ$, alignment is confined to a narrow shear band, leading to localized increases in packing density and pressure. For small $μ$, particles align over a wider region, leading to a nearly uniform packing density and pressure throughout the material. In contrast, spherical particles, regardless of $μ$, maintain a uniform packing density and pressure throughout the material. We observe a phenomenological similarity to the Weissenberg effect in non-Newtonian fluids, where normal stress differences induce radial pressure gradients, unlike the uniform pressure in Newtonian fluids. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_11157 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Shear-induced pressure anisotropy in granular materials of nonspherical particles Rahim, Huzaif Roy, Sudeshna Pöschel, Thorsten Soft Condensed Matter When a granular material composed of elongated grains is sheared in a split-bottom shear cell, a pressure difference develops within the material. This pressure difference depends on the interparticle friction ($μ$), which affects shear localization and particle alignment. For large $μ$, alignment is confined to a narrow shear band, leading to localized increases in packing density and pressure. For small $μ$, particles align over a wider region, leading to a nearly uniform packing density and pressure throughout the material. In contrast, spherical particles, regardless of $μ$, maintain a uniform packing density and pressure throughout the material. We observe a phenomenological similarity to the Weissenberg effect in non-Newtonian fluids, where normal stress differences induce radial pressure gradients, unlike the uniform pressure in Newtonian fluids. |
| title | Shear-induced pressure anisotropy in granular materials of nonspherical particles |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2512.11157 |