Development of an ISRM suggested method for determining mode I static fracture toughness

M. D. Kuruppu, Y. Obara, M. R. Ayatollahi, K. P. Chong, Takahiro Funatsu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A number of standard methods have been proposed to determine the Mode I fracture toughness of rock. They include those based on short rod (SR) specimen, chevron bend (CB) specimen and cracked chevron-notched Brazilian disk (CCNBD) specimen. The semi-circular bend (SCB) specimen has been widely used for fracture toughness determination of geomaterials owing to inherent favourable properties such as its simplicity, minimal requirement of machining and the convenience of testing that can be accomplished by applying 3-point compressive loading using a common laboratory load frame. Use of more than one type of specimen is regarded as appropriate when it is required to measure the fracture toughness of anisotropic materials in different material directions of a rock sample. The objective of this paper is to provide details of the process of development of ISRM Suggested Method for Mode I static fracture toughness determination of rock and other geomaterials using SCB specimen, which was recently approved by ISRM. The details of the development process including the stress intensity factor calibration using the finite element method, improvement of the suggested experimental method including the steps taken to minimise errors, and suggestions to improve the accuracy of results are given.

Original languageEnglish
Title of host publicationISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014
PublisherInternational Society for Rock Mechanics
Pages1555-1563
Number of pages9
ISBN (Electronic)9784907430030
Publication statusPublished - 2014
Externally publishedYes
Event8th Asian Rock Mechanics Symposium, ARMS 2014 - Sapporo, Japan
Duration: Oct 14 2014Oct 16 2014

Other

Other8th Asian Rock Mechanics Symposium, ARMS 2014
CountryJapan
CitySapporo
Period10/14/1410/16/14

Fingerprint

fracture toughness
fracture strength
Fracture toughness
Rocks
rocks
rock
Stress intensity factors
finite element method
Machining
stress intensity factors
Calibration
calibration
Finite element method
machining
suggestion
method
Testing
rods
requirements
material

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

Kuruppu, M. D., Obara, Y., Ayatollahi, M. R., Chong, K. P., & Funatsu, T. (2014). Development of an ISRM suggested method for determining mode I static fracture toughness. In ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014 (pp. 1555-1563). International Society for Rock Mechanics.

Development of an ISRM suggested method for determining mode I static fracture toughness. / Kuruppu, M. D.; Obara, Y.; Ayatollahi, M. R.; Chong, K. P.; Funatsu, Takahiro.

ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014. International Society for Rock Mechanics, 2014. p. 1555-1563.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Kuruppu, MD, Obara, Y, Ayatollahi, MR, Chong, KP & Funatsu, T 2014, Development of an ISRM suggested method for determining mode I static fracture toughness. in ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014. International Society for Rock Mechanics, pp. 1555-1563, 8th Asian Rock Mechanics Symposium, ARMS 2014, Sapporo, Japan, 10/14/14.
Kuruppu MD, Obara Y, Ayatollahi MR, Chong KP, Funatsu T. Development of an ISRM suggested method for determining mode I static fracture toughness. In ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014. International Society for Rock Mechanics. 2014. p. 1555-1563
Kuruppu, M. D. ; Obara, Y. ; Ayatollahi, M. R. ; Chong, K. P. ; Funatsu, Takahiro. / Development of an ISRM suggested method for determining mode I static fracture toughness. ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014. International Society for Rock Mechanics, 2014. pp. 1555-1563
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