Image Analysis of Shear Banding

Jeffery J. Riedel, Qing Lin, Chu Shu Kao, Joseph F. Labuz

Research output: Contribution to conferencePaperpeer-review

3 Scopus citations

Abstract

Plane strain compression tests were performed on Berea sandstone to investigate the mechanisms involved in the development and propagation of a shear band. Thin sections for optical microscopy and digital photographs were prepared by injecting blue-colored epoxy into failed specimens, where deformation localized and softening occurred. The digital image contained three parameters, R, B, and G, that defined the color of each pixel. The intensity of the R channel consistently differentiated the blue (epoxy-filled) pore space from the white grains composing the matrix. The areas of increased porosity did not extend beyond the tip, which was determined by the last observable intragranular microcrack. The porosity change that corresponded to the shear band was observed in areas with high densities of microcracking. Therefore, the localized porosityincrease was related to the evolution of microcracks within the shear band itself.

Original languageEnglish (US)
StatePublished - Dec 1 2008
Event42nd U.S. Rock Mechanics - 2nd U.S.-Canada Rock Mechanics Symposium 2008 - San Francisco, CA, United States
Duration: Jun 29 2008Jul 2 2008

Other

Other42nd U.S. Rock Mechanics - 2nd U.S.-Canada Rock Mechanics Symposium 2008
CountryUnited States
CitySan Francisco, CA
Period6/29/087/2/08

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