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

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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 semicircular 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

Keywords

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

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