ISSN: 1945-7545
CODEN: GTJODJ
Published Online: 17 December 2003
Page Count: 10

Digital Image Correlation to Evaluate Shear Banding in Dilative Sands

Rechenmacher, AL
Assistant Professor, The Johns Hopkins University, Baltimore, MD

Finno, RJ
Professor, Northwestern University, Evanston, IL

(Received 24 October 2001; accepted 10 February 2003)

Abstract

Experimental results are presented of plane strain compression experiments on dense sands, in which the technique of Digital Image Correlation (DIC) was used to quantify localized displacements. The technique is described in detail. Results of accuracy tests of the DIC technique indicated that localized displacements were measured to an accuracy of ±0.008 mm. Typical DIC analyses produced approximately 250 displacement points within a shear band, which served as input for regression based strain computation, yielding highly accurate volumetric strain data for determining evolutions to critical state. Displacement data also were used to investigate volume changes outside the shear band. The DIC technique also enabled measurement of shear band inclination and thickness throughout the deformation process.

Keywords:
shear band, dilative sand, plane strain, Digital Image Correlation, volumetric exchange, local displacements, critical state

Paper ID: GTJ11263J
DOI: 10.1520/GTJ11263J
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