Observing deformation and fracture of rock with speckle patterns

M. Haggerty, Qing Lin, Joseph F Labuz

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The high resolution technique of electronic speckle pattern interferometry (ESPI) can be very useful in determining deformation of laboratory specimens and identifying initiation of failure. The in-plane ESPI theory is described and the fringe pattern of the processed ESPI image is analyzed to determine deformation and crack opening displacement. Fringes on the ESPI image represent lines of equal intensity, which relate to surface displacement. An ESPI system was constructed and calibrated for measuring uni-directional displacements. Several types of the experiments, such as uniaxial compression and fracture testing, were conducted to demonstrate the utility of ESPI.

Original languageEnglish (US)
Pages (from-to)417-426
Number of pages10
JournalRock Mechanics and Rock Engineering
Volume43
Issue number4
DOIs
StatePublished - Jul 1 2010

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speckle
Speckle
interferometry
Interferometry
Rocks
rock
Fracture testing
Compression testing
electronics
crack
compression
Cracks
experiment
Experiments

Keywords

  • Electronic speckle pattern interferometry (ESPI)
  • Fracture initiation
  • Fringe pattern
  • Laser speckle
  • Speckle effect
  • Speckle interferometry
  • Stress intensity factor

Cite this

Observing deformation and fracture of rock with speckle patterns. / Haggerty, M.; Lin, Qing; Labuz, Joseph F.

In: Rock Mechanics and Rock Engineering, Vol. 43, No. 4, 01.07.2010, p. 417-426.

Research output: Contribution to journalArticle

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