Application of discrete element method for validity evaluation of rock dynamic fracture toughness measured by Semi-Circular Bend technique

Tohid Kazerani, J. Zhao

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

1 Citation (Scopus)


The Semi-Circular Bend (SCB) dynamic fracture toughness test, performed by the split-Hopkinson pressure bar, is simulated using a discrete element model. The influence of fracture constitutive law, loading rate and frictional boundary condition on the test measurements is investigated. It is found that friction between loading bars and rock specimen will severely affects on the test results and must be, therefore, considered carefully to secure the accuracy of the measurement. Simulation results also show that a rate-dependent fracture law is needed to predict the test data properly. Furthermore, the study suggests that the SCB specimen fractures before the peak dynamic load, based on which dynamic fracture toughness is calculated, is reached. Hence, the technique overestimates the dynamic fracture toughness of material.

Original languageEnglish
Title of host publicationHarmonising Rock Engineering and the Environment - Proceedings of the 12th ISRM International Congress on Rock Mechanics
Number of pages4
ISBN (Print)9780415804448
Publication statusPublished - 2012
Externally publishedYes
EventInternational Society of Rock Mechanics Series of Symposia and Conferences 2011 - China National Convention Center (CNCC), Beijing, China
Duration: 18 Oct 201121 Oct 2011
Conference number: 12th


ConferenceInternational Society of Rock Mechanics Series of Symposia and Conferences 2011
Abbreviated titleISRM 2011
OtherInternational Congress on Rock Mechanics of the International Society for Rock Mechanics 2011

Proceedings title = Harmonising Rock Engineering and the Environment
Internet address


  • Dynamics
  • Numerical modeling
  • Rock failure
  • Rock properties

Cite this