Numerical modeling of material flow with an internal length

Frédéric Dufour (1) , Gilles Pijaudier-Cabot (1)

1 GeM - Institut de Recherche en Génie Civil et Mécanique

In this paper we propose a new numerical method to study material flow with an internal length. The finite element method with Lagrangian interpolation points (FEMLIP) is used for its capability to model large deformation processes for any type of materials. It is widely accepted in the litterature that fresh concrete rheology is very well estimated by Bigham model in the classical continuum approach. Nevertheless in most cases the form size and the distance between reinforced bars are about few times greater than aggregate size itself. This means that the microstructure has a non negligible effect on the flow (aggregate rotation independent of material rotation + boundary layer effect) and that it must be taken into account to get a good estimation of the filling capability of the material. We propose to use a Cosserat continuum with a Bingham law to tackle this work.

Mots clés: Cosserat model; Bingham rheology; fresh concrete flow

Domaines: Mécanique [physics.med-ph]; Matériaux

Frédéric Dufour, Gilles Pijaudier-Cabot. Numerical modeling of material flow with an internal length. 17th ASCE Engineerings Mechanics Conference, Jun 2004, Newark, United States. ⟨hal-01008547⟩