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- W2237156297 abstract "Experimental Study of Shear and Compaction Band Formation in Berea Sandstone. (December 2008) Elizabeth Anne Herrin, B.S., Texas A&M University Chair of Advisory Committee: Dr. Frederick M. Chester Many field, experimental, and theoretical studies have contributed greatly to our understanding of the occurrence and formation of deformation bands in porous granular materials, but questions remain regarding the mechanics of strain localization, and how the orientation, thickness and internal strain (shear relative to volume change) of deformation bands is influenced by loading history and evolving rock properties. Here we report on triaxial rock deformation experiments using a non-traditional sample geometry to investigate band formation across the brittle-ductile transition. Five-cm diameter cylinders of Berea sandstone were machined with a circular (8.77 cm radius) notch to form a dog-bone sample geometry. In triaxial compression, the sample geometry obviates end-effects without creating heterogeneous stress gradients that can influence localization. Samples were instrumented to measure local strains in the neck region and acoustic emissions (AE), and then shortened to failure at confining pressures of 50 to 250 MPa. Deformation bands formed at all conditions, and photo mosaics of the outer sample surface were used to determine the thickness and orientation of the bands. Band thickness increases from several to tens of mm thickness and the angle" @default.
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- W2237156297 date "2009-05-15" @default.
- W2237156297 modified "2023-09-27" @default.
- W2237156297 title "Experimental study of shear and compaction band formation in berea sandstone" @default.
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