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, Takahiro Funatsu

Research output: Contribution to journalArticle

177 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)267-274
Number of pages8
JournalRock Mechanics and Rock Engineering
Volume47
Issue number1
DOIs
Publication statusPublished - Jan 1 2014

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fracture toughness
Fracture toughness
Rocks
compression
rock
Sedimentary rocks
Rock mechanics
rock mechanics
sedimentary rock
Materials properties
method
material
laboratory
test

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology
  • Geology

Cite this

ISRM-suggested method for determining the mode i static fracture toughness using semi-circular bend specimen. / Kuruppu, M. D.; Obara, Y.; Ayatollahi, M. R.; Chong, K. P.; Funatsu, Takahiro.

In: Rock Mechanics and Rock Engineering, Vol. 47, No. 1, 01.01.2014, p. 267-274.

Research output: Contribution to journalArticle

Kuruppu, M. D. ; Obara, Y. ; Ayatollahi, M. R. ; Chong, K. P. ; Funatsu, Takahiro. / ISRM-suggested method for determining the mode i static fracture toughness using semi-circular bend specimen. In: Rock Mechanics and Rock Engineering. 2014 ; Vol. 47, No. 1. pp. 267-274.
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