TY - JOUR
T1 - Fracture toughness testing of core-based specimens by acoustic emission
AU - Hashida, T.
N1 - Funding Information:
Acknowledgements--The author wishes to express his gratitude to Professor H. Takahashi, Tohoku University for his continued support and guidance throughout this investigation. He also acknowledges Dr Finn Ouchterlony, Swedish Detonic Research Foundation, Sweden, for his helpful discussions. He gratefully acknowledges the assistance of Mr T. Fukasawa in performing the experimental work reported here. Financial support for this work was provided in part by the Japan Society for the Promotion of Science, and in part by the Japan Ministry of Education, Science and Culture and under Grant-in-Aid for Special Distinguished Research No. 58065002.
PY - 1993/2
Y1 - 1993/2
N2 - Recently, a pair of "Suggested Methods for Determining the fracture toughness of rock" have been proposed by the ISRM. The fracture testing methods specify two chevron-notched specimens, the chevron bend (CB) and the short rod (SR). In this study, fracture toughness tests according to the Suggested Testing Methods were conducted on CB and SR specimens of a granite. In addition to these specimens, straight-notched core specimens with three different geometries were tested, using the J-integral approach combined with an acoustic emission technique to determine the fracture toughness. Results from the two testing methods were compared with special reference to specimen geometry compatibility. The fracture toughness determined by the ISRM Suggested Methods showed a specimen geometry effect, and a possible reason for this result was discussed. In contrast, it was shown that the J-iintegral/AE method as applied to the straight-notched specimens provides a suitable evaluation procedure for core-based fracture toughness testing of rock.
AB - Recently, a pair of "Suggested Methods for Determining the fracture toughness of rock" have been proposed by the ISRM. The fracture testing methods specify two chevron-notched specimens, the chevron bend (CB) and the short rod (SR). In this study, fracture toughness tests according to the Suggested Testing Methods were conducted on CB and SR specimens of a granite. In addition to these specimens, straight-notched core specimens with three different geometries were tested, using the J-integral approach combined with an acoustic emission technique to determine the fracture toughness. Results from the two testing methods were compared with special reference to specimen geometry compatibility. The fracture toughness determined by the ISRM Suggested Methods showed a specimen geometry effect, and a possible reason for this result was discussed. In contrast, it was shown that the J-iintegral/AE method as applied to the straight-notched specimens provides a suitable evaluation procedure for core-based fracture toughness testing of rock.
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U2 - 10.1016/0148-9062(93)90176-E
DO - 10.1016/0148-9062(93)90176-E
M3 - Article
AN - SCOPUS:0027388279
SN - 1365-1609
VL - 30
SP - 61
EP - 69
JO - International Journal of Rock Mechanics and Minings Sciences
JF - International Journal of Rock Mechanics and Minings Sciences
IS - 1
ER -