Abstract
An incremental elastic-plastic model of granular material is proposed. The theory is based on dilatational plasticity for the irreversible part of deformation and hypoelasticity for the reversible part. The hardening and hypoelastic moduli are postulated to be functions of density changes. The resulting coupling of reversible and irreversible deformation laws is discussed. Experiments were carried out in the uniaxial strain state on several granular media (e. g. wheat and rice grains) and compared with the theoretical solution. The procedure for determination of material functions is presented.
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