BEM calibration of the short-rod specimen for fracture toughness test of rock

Kazuo Hayashi; Hitoshi Saito

doi:10.1299/jsmea1988.34.4_464

BEM calibration of the short-rod specimen for fracture toughness test of rock

Kazuo Hayashi, Hitoshi Saito

Institute of Fluid Science (IFS)

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

The results of numerical calibration of a standard short-rod rock specimen with a chevron crack used in the ISRM suggested method are reported, where the boundary element method was used to compute compliance, the stress intensity factor based on the compliance and the distribution of the local stress intensity factor along the crack front edge for various crack depths. The local stress intensity factor is never uniform for a straight front edge of the crack. The change of the shape of the front edge during the fracture toughness test was computed for two cases. In the first case, crack growth resistance is independent of crack growth and, in the second case, crack growth resistance increases with crack growth. Based on the results of the calibration, the validity of the ISRM suggested method for the measurement of rock fracture toughness is discussed.

Original language	English
Pages (from-to)	464-469
Number of pages	6
Journal	JSME International Journal, Series 1: Solid Mechanics, Strength of Materials
Volume	34
Issue number	4
DOIs	https://doi.org/10.1299/jsmea1988.34.4_464
Publication status	Published - 1991

ASJC Scopus subject areas

Engineering(all)

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title = "BEM calibration of the short-rod specimen for fracture toughness test of rock",

abstract = "The results of numerical calibration of a standard short-rod rock specimen with a chevron crack used in the ISRM suggested method are reported, where the boundary element method was used to compute compliance, the stress intensity factor based on the compliance and the distribution of the local stress intensity factor along the crack front edge for various crack depths. The local stress intensity factor is never uniform for a straight front edge of the crack. The change of the shape of the front edge during the fracture toughness test was computed for two cases. In the first case, crack growth resistance is independent of crack growth and, in the second case, crack growth resistance increases with crack growth. Based on the results of the calibration, the validity of the ISRM suggested method for the measurement of rock fracture toughness is discussed.",

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T1 - BEM calibration of the short-rod specimen for fracture toughness test of rock

AU - Hayashi, Kazuo

AU - Saito, Hitoshi

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N2 - The results of numerical calibration of a standard short-rod rock specimen with a chevron crack used in the ISRM suggested method are reported, where the boundary element method was used to compute compliance, the stress intensity factor based on the compliance and the distribution of the local stress intensity factor along the crack front edge for various crack depths. The local stress intensity factor is never uniform for a straight front edge of the crack. The change of the shape of the front edge during the fracture toughness test was computed for two cases. In the first case, crack growth resistance is independent of crack growth and, in the second case, crack growth resistance increases with crack growth. Based on the results of the calibration, the validity of the ISRM suggested method for the measurement of rock fracture toughness is discussed.

AB - The results of numerical calibration of a standard short-rod rock specimen with a chevron crack used in the ISRM suggested method are reported, where the boundary element method was used to compute compliance, the stress intensity factor based on the compliance and the distribution of the local stress intensity factor along the crack front edge for various crack depths. The local stress intensity factor is never uniform for a straight front edge of the crack. The change of the shape of the front edge during the fracture toughness test was computed for two cases. In the first case, crack growth resistance is independent of crack growth and, in the second case, crack growth resistance increases with crack growth. Based on the results of the calibration, the validity of the ISRM suggested method for the measurement of rock fracture toughness is discussed.

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