Injecting particle scale physics into continuum models of granular materials for large-scale applications

S. D C Walsh, A. Tordesillas

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

Models of granular materials that incorporate grain scale behaviour can be developed using a "bottom-up" approach known as micromechanics. Typically these models are derived from laws introduced to represent inter-particle contact behaviour. Here models based on two separate contact laws are compared. The first law is based on a binary contact interaction governed by spring-slider systems similar to those used in discrete element methods. In the second model, an effective contact law is introduced that is based on the observed behaviour of particle clusters. While the model based on the binary contact law can reproduce some aspects of granular behaviour, it is not capable of predicting both strain softening and dilatant behaviour under biaxial compression. In contrast, the effective contact law is able to reproduce not only the correct stress-strain response, but also the observed microstructural evolution in the two cases examined: uniform deformation and strain localisation. It has the additional advantage that it is able to simulate granular assemblies where the numbers of particles involved would make discrete element methods impractical. To demonstrate this ability results from a finite element simulation of an assembly consisting of over half a million particles are presented. These results suggest that the contact laws used in micromechanical models must account for physical mechanisms occurring in at least two length scales: at the contacts and within particle clusters. Copyright ASCE 2006.

Original languageEnglish
Title of host publicationEarth and Space 2006 - Proceedings of the 10th Biennial International Conference on Engineering, Construction, and Operations in Challenging Environments
Number of pages8
Volume2006
DOIs
Publication statusPublished - 28 Dec 2006
Externally publishedYes
EventEarth and Space 2006 : Biennial International Conference on Engineering, Construction, and Operations in Challenging Environments - League City/Houston, United States of America
Duration: 5 Mar 20068 Mar 2006
Conference number: 10th

Conference

ConferenceEarth and Space 2006
CountryUnited States of America
CityLeague City/Houston
Period5/03/068/03/06

Cite this

Walsh, S. D. C., & Tordesillas, A. (2006). Injecting particle scale physics into continuum models of granular materials for large-scale applications. In Earth and Space 2006 - Proceedings of the 10th Biennial International Conference on Engineering, Construction, and Operations in Challenging Environments (Vol. 2006) https://doi.org/10.1061/40830(188)31