Rock Mechanics and Rock Engineering

, Volume 47, Issue 1, pp 267–274 | Cite as

ISRM-Suggested Method for Determining the Mode I Static Fracture Toughness Using Semi-Circular Bend Specimen

  • M. D. Kuruppu
  • Y. Obara
  • M. R. Ayatollahi
  • K. P. Chong
  • T. Funatsu
ISRM Suggested Method


The International Society for Rock Mechanics has so far developed two standard methods for the determination of static fracture toughness of rock. They used three different core-based specimens and tests were to be performed on a typical laboratory compression or tension load frame. Another method to determine the mode I fracture toughness of rock using semi-circular bend specimen is herein presented. The specimen is semi-circular in shape and made from typical cores taken from the rock with any relative material directions noted. The specimens are tested in three-point bending using a laboratory compression test instrument. The failure load along with its dimensions is used to determine the fracture toughness. Most sedimentary rocks which are layered in structure may exhibit fracture properties that depend on the orientation and therefore measurements in more than one material direction may be necessary. The fracture toughness measurements are expected to yield a size-independent material property if certain minimum specimen size requirements are satisfied.


Rock fracture mechanics Mode I fracture toughness Semi-circular bend specimen Fracture testing Sedimentary rock In situ environment 



The authors thankfully acknowledge the guidance and encouragement given by Prof. Resat Ulusay, President of the ISRM commission on testing methods, and other commission members in order to develop this suggested method.


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Copyright information

© Springer-Verlag Wien 2013

Authors and Affiliations

  • M. D. Kuruppu
    • 1
  • Y. Obara
    • 2
  • M. R. Ayatollahi
    • 3
  • K. P. Chong
    • 4
    • 5
  • T. Funatsu
    • 6
  1. 1.Curtin UniversityKalgoorlieAustralia
  2. 2.Graduate School of Science and TechnologyKumamoto UniversityKumamotoJapan
  3. 3.School of Mechanical EngineeringIran University of Science and TechnologyTehranIran
  4. 4.National Institute of Standards and TechnologyGaithersburgUSA
  5. 5.Department of Mechanical EngineeringGeorge Washington UniversityWashington DCUSA
  6. 6.Institute for Geo-Resources and Environment, AISTTsukubaJapan

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