Numerical study of the semi-circular bend dynamic fracture toughness test using discrete element models

GaoFeng Zhao, Tohid Kazerani, Ke Man, Ming Zhi Gao, Jian Zhao

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14 Citations (Scopus)

Abstract

The semi-circular bend (SCB) dynamic fracture toughness test is simulated using discrete element models. The influence of the frictional boundary condition, constitutive law and specimen thickness on the test measurements is investigated. It is found that friction between loading plates and the rock specimen affects the test results. Therefore, friction must be carefully considered to obtain accurate measurements. The simulation results also show that in contrast to the 2D model in which a rate-dependent cohesive law must be introduced, 3D models with a rate-independent law can produce good results. Furthermore, the study suggests that test measurements are seriously affected by specimen thickness; thus, full 3D modeling is required for simulation of the SCB test.
Original languageEnglish
Pages (from-to)1587 - 1595
Number of pages9
JournalScience China Technological Sciences
Volume58
Issue number9
DOIs
Publication statusPublished - 16 Jul 2015

Keywords

  • Dynamic fracture toughness
  • Rock
  • Discrete element model
  • Friction

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