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 journalArticle (Academic Journal)peer-review

64 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 languageEnglish
JournalGeomechanics and Engineering
Volume20
Issue number1
DOIs
Publication statusPublished - 10 Jan 2020

Keywords

  • sandstone
  • fracture
  • T-stress
  • three-point bending
  • different criteria

Fingerprint Dive into the research topics of 'Measurement of the mixed mode fracture strength of green sandstone using three-point bending specimens'. Together they form a unique fingerprint.

Cite this