TY - GEN
T1 - Development of an ISRM suggested method for determining mode I static fracture toughness
AU - Kuruppu, M. D.
AU - Obara, Y.
AU - Ayatollahi, M. R.
AU - Chong, K. P.
AU - Funatsu, T.
N1 - Publisher Copyright:
© 2014 by Japanese Committee for Rock Mechanics.
PY - 2014
Y1 - 2014
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:84962362105
T3 - ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014
SP - 1555
EP - 1563
BT - ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014
A2 - Kaneko, null
A2 - Kodama, null
A2 - Shimizu, null
PB - International Society for Rock Mechanics
T2 - 8th Asian Rock Mechanics Symposium, ARMS 2014
Y2 - 14 October 2014 through 16 October 2014
ER -