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Communication Dans Un Congrès Année : 2009

Discrete simulations of model, loose cohesive powders: plastic consolidation, fractal microstructure and tensile strength

Résumé

Isotropic packings of cohesive disks in 2D are studied by discrete, stress-controlled numerical simulations. Depending on the assembling process and on whether contacts possess rolling resistance (RR), configurations form under low pressure $P$ with varying solid fraction $\Phi$ and fractal dimension $d_F$ describing small scale correlations below some blob size $\xi$. The gradual collapse observed under growing $P$ is described as a linear relation between $\ln P$ and $1/\Phi$ within some range, once the influence of initial conditions has faded out, and until a maximum density is approached. This corresponds to a decrease of $\xi$ that is compatible with the fractal blob model. The isotropic tensile strength is always considerably smaller than the naive Rumpf estimate, and grows with consolidation. Coordination numbers in systems with small RR change little while density increases by large amounts in consolidation.
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Dates et versions

hal-00531800 , version 1 (03-11-2010)

Identifiants

  • HAL Id : hal-00531800 , version 1

Citer

Francisco Gilabert, Jean-Noël Roux, Antonio Castellanos. Discrete simulations of model, loose cohesive powders: plastic consolidation, fractal microstructure and tensile strength. Powders and Grains 2009, Jul 2009, Golden, United States. pp.889-892. ⟨hal-00531800⟩
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