A thermodynamics-based cohesive model for discrete element modelling of fracture in cemented materials

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

Research output: Contribution to journalArticleResearchpeer-review

25 Citations (Scopus)

Abstract

In this research, a discrete modelling approach employing a new cohesive model is proposed to investigate the failure response of cemented materials. A cohesive model considering mixed-mode fracture is developed based on a generic thermodynamic framework for coupling damage mechanics and plasticity theory. Discrete Element Method (DEM), a well-known computational method for simulating large deformation and cracking issues, is utilised as a numerical platform to facilitate the implementation of the proposed cohesive model. The nature of discrete modelling is analogous to the internal structure of cemented materials, making it more efficient compared with conventional continuum methods to characterise the failure behaviour of cemented materials. This combined cohesive-discrete modelling approach is then employed to simulate four experimental tests under different boundary conditions. Simulation results show excellent agreements with the experiments in terms of both macro force-displacement responses and cracking patterns, suggesting the effectiveness of the proposed modelling approach for conducting numerical experiments and exploring the failure mechanisms in cemented materials.

Original languageEnglish
Pages (from-to)159–176
Number of pages18
JournalInternational Journal of Solids and Structures
Volume117
DOIs
Publication statusPublished - 15 Jun 2017

Keywords

  • Cemented materials
  • Cohesive model
  • Damage mechanics
  • Discrete element method
  • Plasticity theory
  • Thermodynamic

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