期刊
GRANULAR MATTER
卷 18, 期 2, 页码 -出版社
SPRINGER
DOI: 10.1007/s10035-015-0600-2
关键词
Packings; Stress-strain; Strain-stiffening; Stability
资金
- NSF [CBET-1334426, DMR-1420709]
- University of Chicagos Arete B.I.G. program
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1334426] Funding Source: National Science Foundation
Architectural structures such as masonry walls or columns exhibit a slender verticality, in contrast to the squat, sloped forms obtained with typical unconfined granular materials. Here we demonstrate the ability to create freestanding, weight-bearing, similarly slender and vertical structures by the simple pouring of suitably shaped dry particles into a mold that is subsequently removed. Combining experiments and simulations we explore a family of particle types that can entangle through their non-convex, hooked shape. We show that Z-shaped particles produce granular aggregates which can either be fluid and pourable, or solid and rigid enough to maintain vertical interfaces and build freestanding columns of large aspect ratio (>10) that support compressive loads without external confinement. We investigate the stability of such columns with uniaxial compression, bending, and vibration tests and compare with other particle types including U-shaped particles and rods. We find a pronounced anisotropy in the internal stress propagation together with strong strain-stiffening, which stabilizes rather than destabilizes the structures under load.
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