Measurement of the mixed mode fracture strength of green sandstone using three-point bending specimens

Yifan Li; Shiming Dong; Martyn J Pavier

doi:10.12989/gae.2020.20.1.009

Measurement of the mixed mode fracture strength of green sandstone using three-point bending specimens

Yifan Li, Shiming Dong, Martyn J Pavier

Research output: Contribution to journal › Article (Academic Journal) › peer-review

11 Citations (Scopus)

171 Downloads (Pure)

Abstract

Three-point bending specimens have been used to investigate the mixed mode fracture of green sandstone. Dimensionless stress intensity factors and T-stresses were calculated first by using the finite element method for various crack lengths, crack angles and span to length ratios. It is shown that three-point bending specimens can provide the whole range of mode mixities from pure mode I to pure mode II, provided suitable values are chosen for the crack angle and span to length ratio. The fracture test results were also used to compare with predictions of different criteria. These comparisons show that modified criteria including the influence of the T-stress agree better with experiment than the conventional criteria but that no one criterion matches perfectly the test results.

Original language	English
Journal	Geomechanics and Engineering
Volume	20
Issue number	1
DOIs	https://doi.org/10.12989/gae.2020.20.1.009
Publication status	Published - 10 Jan 2020

Keywords

sandstone
fracture
T-stress
three-point bending
different criteria

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title = "Measurement of the mixed mode fracture strength of green sandstone using three-point bending specimens",

abstract = " Three-point bending specimens have been used to investigate the mixed mode fracture of green sandstone. Dimensionless stress intensity factors and T-stresses were calculated first by using the finite element method for various crack lengths, crack angles and span to length ratios. It is shown that three-point bending specimens can provide the whole range of mode mixities from pure mode I to pure mode II, provided suitable values are chosen for the crack angle and span to length ratio. The fracture test results were also used to compare with predictions of different criteria. These comparisons show that modified criteria including the influence of the T-stress agree better with experiment than the conventional criteria but that no one criterion matches perfectly the test results.",

keywords = "sandstone, fracture, T-stress, three-point bending, different criteria",

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AU - Li, Yifan

AU - Dong, Shiming

AU - Pavier, Martyn J

PY - 2020/1/10

Y1 - 2020/1/10

N2 - Three-point bending specimens have been used to investigate the mixed mode fracture of green sandstone. Dimensionless stress intensity factors and T-stresses were calculated first by using the finite element method for various crack lengths, crack angles and span to length ratios. It is shown that three-point bending specimens can provide the whole range of mode mixities from pure mode I to pure mode II, provided suitable values are chosen for the crack angle and span to length ratio. The fracture test results were also used to compare with predictions of different criteria. These comparisons show that modified criteria including the influence of the T-stress agree better with experiment than the conventional criteria but that no one criterion matches perfectly the test results.

AB - Three-point bending specimens have been used to investigate the mixed mode fracture of green sandstone. Dimensionless stress intensity factors and T-stresses were calculated first by using the finite element method for various crack lengths, crack angles and span to length ratios. It is shown that three-point bending specimens can provide the whole range of mode mixities from pure mode I to pure mode II, provided suitable values are chosen for the crack angle and span to length ratio. The fracture test results were also used to compare with predictions of different criteria. These comparisons show that modified criteria including the influence of the T-stress agree better with experiment than the conventional criteria but that no one criterion matches perfectly the test results.

KW - sandstone

KW - fracture

KW - T-stress

KW - three-point bending

KW - different criteria

U2 - 10.12989/gae.2020.20.1.009

DO - 10.12989/gae.2020.20.1.009

M3 - Article (Academic Journal)

SN - 2005-307X

VL - 20

JO - Geomechanics and Engineering

JF - Geomechanics and Engineering

IS - 1

ER -

Measurement of the mixed mode fracture strength of green sandstone using three-point bending specimens

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