Observing Deformation and Fracture of Rock with Speckle Patterns

Published on Jul 1, 2010in Rock Mechanics and Rock Engineering4.14
· DOI :10.1007/S00603-009-0055-Z
M. Haggerty3
Estimated H-index: 3
(UMN: University of Minnesota),
Qing Lin11
Estimated H-index: 11
(UMN: University of Minnesota),
Joseph F. Labuz32
Estimated H-index: 32
(UMN: University of Minnesota)
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.
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