Discrete element modelling of fracture in quasi-brittle materials

Nhu H.T. Nguyen, Ha H. Bui, J. Kodikara, S. Arooran, Giang D. Nguyen, P. Jitsangiam

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

Abstract

The fracture of quasi-brittle materials (e.g. concrete, soft rock) has long been a crucial issue in research and engineering. In the past few decades, numerical methods have been applied to investigate the fracture mechanism of these material types. Among others (e.g. FEM, mesh-free), Discrete Element Method is regarded as an efficient numerical method to model the failure of materials owing to its advantages for fracture modelling over the classical continuum-based methods. However, despite its powerful nature, current contact models for DEM are not capable of capturing the local failure mechanisms of cement binder contacts between aggregates in quasi-brittle materials. This research applies a cohesive model into DEM simulation to characterise and investigate the failure responses of quasi-brittle materials. The model couples damage mechanics and plasticity theory, and also can handle fracture under mixed-mode stresses. This modelling approach is then employed to simulate experimental tests of quasibrittle materials. Numerical results are shown to agree with the fracture behaviour of the materials in experiments and better than the result of current most popularly used model in DEM simulation.

Original languageEnglish
Title of host publicationMechanics of Structures and Materials
Subtitle of host publicationAdvancements and Challenges - Proceedings of the 24th Australasian Conference on the Mechanics of Structures and Materials, ACMSM24 2016
PublisherCRC Press
Pages329-336
Number of pages8
ISBN (Print)9781138029934
Publication statusPublished - 1 Jan 2017
EventAustralasian Conference on the Mechanics of Structures and Materials 2016 - Perth, Australia
Duration: 6 Dec 20169 Dec 2016
Conference number: 24th

Conference

ConferenceAustralasian Conference on the Mechanics of Structures and Materials 2016
Abbreviated titleACMSM 2016
CountryAustralia
CityPerth
Period6/12/169/12/16

Cite this

Nguyen, N. H. T., Bui, H. H., Kodikara, J., Arooran, S., Nguyen, G. D., & Jitsangiam, P. (2017). Discrete element modelling of fracture in quasi-brittle materials. In Mechanics of Structures and Materials: Advancements and Challenges - Proceedings of the 24th Australasian Conference on the Mechanics of Structures and Materials, ACMSM24 2016 (pp. 329-336). CRC Press.