Modelling the dynamic failure of brittle rocks using a hybrid continuum-discrete element method with a mixed-mode cohesive fracture model

Yi Lin Gui, Ha H. Bui, Jayantha Kodikara, Qian Bing Zhang, Jian Zhao, Timon Rabczuk

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

A cohesive fracture model that combines tension, compression and shear material behaviour is implemented into the hybrid continuum-discrete element method, i.e. Universal Distinct Element Code (UDEC), to simulate fracturing process in rock dynamic tests. The fracture model considers both elastic and inelastic (decomposed to fracture and plastic) displacements, with the norm of the effective inelastic displacement used to control the fracture behaviour. Two numerical examples, including notched semi-circular bending and Brazilian disc tests, are conducted to verify the applicability of the model in simulating the dynamic failure of rocks. Results show that the proposed approach is capable of realistically simulating the load rate effects on the mechanical behaviour of rock materials subjected to dynamic loads.

Original languageEnglish
Pages (from-to)146-155
Number of pages10
JournalInternational Journal of Impact Engineering
Volume87
DOIs
Publication statusPublished - 2016 Jan 1
Externally publishedYes

Keywords

  • Brazilian disc test
  • Cohesive fracture model
  • Dynamic failure
  • Mixed-mode
  • Notched semi-circular bending

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Civil and Structural Engineering
  • Aerospace Engineering
  • Automotive Engineering
  • Ocean Engineering
  • Safety, Risk, Reliability and Quality

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