Identification of nonlinear fracture properties from size effect tests and structural analysis based on geometry-dependent R-curves

Z. P. Bažant; R. Gettu; M. T. Kazemi

doi:10.1016/0148-9062(91)93232-U

Identification of nonlinear fracture properties from size effect tests and structural analysis based on geometry-dependent R-curves

Z. P. Bažant^*, R. Gettu, M. T. Kazemi

^*Corresponding author for this work

Civil and Environmental Engineering

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

142 Scopus citations

Abstract

The size effect method, previously developed for concrete and mortar, is demonstrated for rock. Geometrically similar fracture specimens of limestone are tested and the measured maximum load values are used to obtain fracture energy, fracture toughness and effective size of the fracture process zone. Further, it is shown how to determine, from these results, other nonlinear fracture parameters including the critical effective crack-tip opening displacement. R-curves, dependent on specimen geometry, are calculated and used to predict load-deflection curves, which are found to agree very well with measurements. A modification of the R-curves for post-peak response is proposed.

Original language	English (US)
Pages (from-to)	43-51
Number of pages	9
Journal	International Journal of Rock Mechanics and Mining Sciences and
Volume	28
Issue number	1
DOIs	https://doi.org/10.1016/0148-9062(91)93232-U
State	Published - Jan 1991

ASJC Scopus subject areas

Geotechnical Engineering and Engineering Geology
General Engineering

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abstract = "The size effect method, previously developed for concrete and mortar, is demonstrated for rock. Geometrically similar fracture specimens of limestone are tested and the measured maximum load values are used to obtain fracture energy, fracture toughness and effective size of the fracture process zone. Further, it is shown how to determine, from these results, other nonlinear fracture parameters including the critical effective crack-tip opening displacement. R-curves, dependent on specimen geometry, are calculated and used to predict load-deflection curves, which are found to agree very well with measurements. A modification of the R-curves for post-peak response is proposed.",

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AU - Gettu, R.

AU - Kazemi, M. T.

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Y1 - 1991/1

N2 - The size effect method, previously developed for concrete and mortar, is demonstrated for rock. Geometrically similar fracture specimens of limestone are tested and the measured maximum load values are used to obtain fracture energy, fracture toughness and effective size of the fracture process zone. Further, it is shown how to determine, from these results, other nonlinear fracture parameters including the critical effective crack-tip opening displacement. R-curves, dependent on specimen geometry, are calculated and used to predict load-deflection curves, which are found to agree very well with measurements. A modification of the R-curves for post-peak response is proposed.

AB - The size effect method, previously developed for concrete and mortar, is demonstrated for rock. Geometrically similar fracture specimens of limestone are tested and the measured maximum load values are used to obtain fracture energy, fracture toughness and effective size of the fracture process zone. Further, it is shown how to determine, from these results, other nonlinear fracture parameters including the critical effective crack-tip opening displacement. R-curves, dependent on specimen geometry, are calculated and used to predict load-deflection curves, which are found to agree very well with measurements. A modification of the R-curves for post-peak response is proposed.

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Identification of nonlinear fracture properties from size effect tests and structural analysis based on geometry-dependent R-curves

Abstract

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