Micromechanical constitutive modelling of granular media: Evolution and loss of contact in particle clusters

Gardiner, B.S. and Tordesillas, A. (2005) Micromechanical constitutive modelling of granular media: Evolution and loss of contact in particle clusters. In: Hill, J.M. and Selvadurai, A.P.S., (eds.) Mathematics and Mechanics of Granular Materials: Mathematics and Mechanics of Granular Materials. Springer Netherlands, pp. 93-106.

Abstract

Micromechanical constitutive equations are developed which allow for the broad range of interparticle interactions observed in a real deforming granular assembly: microslip contact, gross slip contact, loss of contact and an evolution in these modes of contact as the deformation proceeds. This was accomplished through a synergetic use of contact laws, which account for interparticle resistance to both sliding and rolling, together with strain-dependent anisotropies in contacts and the normal contact force. By applying the constitutive model to the bi-axial test it is demonstrated that the model can correctly predict the evolution of various anisotropies as well as the formation of a distinct shear band. Moreover, the predicted shear-band properties (e.g. thickness, prolonged localisation, void ratio) are an even better fit with experimental observations than were previously found by use of previously developed micromechanical models.

Item Type:	Book Chapter
Publisher:	Springer Netherlands
Copyright:	2005 Springer
URI:	http://researchrepository.murdoch.edu.au/id/eprint/34456

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