On the definition of the stress tensor in granular media

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:50

Article

Nicot, Francois¹  Hadda, Nejib¹  Guessasma, Mohamed²  Fortin, Jerome²  Millet, Olivier³ 

[1] IRSTEA, Grenoble, France

[2] LTI, St Quentin en Yvelines, France

[3] Univ La Rochelle, LaSIE, La Rochelle, France

关键词: Stress;    Granular materials;    Homogenization;    Micromechanics;    Microstructure;    Discrete element method;    Inertial effects;   

DOI  :  10.1016/j.ijsolstr.2013.04.001

来源: Elsevier

【 摘 要 】

This paper investigates the definition of the stress tensor within a granular assembly, when inertial effects are likely to occur. It is shown that the stress tensor can be expressed as a sum of two terms. A first term corresponds to the standard definition of the stress, according to the Love-Weber formula; this term is related to the contact forces existing within adjoining particles. A second term accounts for dynamic effects related to rotation velocities and accelerations of the particles. These results are checked from discrete numerical simulations in order to examine in which context the contribution of inertial effects should not be omitted. With this aim, the simulation of a granular specimen collapse and then a silo discharge is considered. (C) 2013 Elsevier Ltd. All rights reserved.

【 授权许可】

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