DIGITAL IMAGE CORRELATION (DIC) TO EVALUATE PROGRESSION AND UNIFORMITY OF SHEAR BANDS IN DILATIVE SANDS

Abstract eng:
Digital Image Correlation (DIC) has been used to measure local deformations in dense sands to evaluate deformation patterns associated with shear band formation and the uniformity of deformation within persistent shear bands. Displacement vectors and contours of specimen behavior were produced and quantitatively illustrate the patterns of deformation associated with the evolution of displacement from uniform to localized. Results indicate a consistent pattern of uniform deformation, followed by shearing along conjugate planes which eventually yield to one persistent shear band. The wealth of displacement data produced by a typical DIC allowed analysis of strain uniformity along the length of a shear band. Results indicate erratic volumetric behavior along the length of the shear band prior to critical state, and fairly uniform deformation during and after critical state is achieved.

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