Deformation field in indentation of a granular ensemble

Murthy, Tejas G. and Gnanamanickam, Ebenezer and Chandrasekar, Srinivasan (2012) Deformation field in indentation of a granular ensemble. In: PHYSICAL REVIEW E, 85 (6, Par).

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Abstract

An experimental study has been made of the flow field in indentation of a model granular material. A granular ensemble composed of spherical sand particles with average size of 0.4 mm is indented with a flat ended punch under plane-strain conditions. The region around the indenter is imaged in situ using a high-speed charge-coupled device (CCD) imaging system. By applying a hybrid image analysis technique to image sequences of the indentation, flow parameters such as velocity, velocity gradient, and strain rate are measured at high resolution. The measurements have enabled characterization of the main features of the flow such as dead material zones, velocity jumps, localization of deformation, and regions of highly rotational flow resembling vortices. Implications for validation of theoretical analyses and applications are discussed.

Item Type:	Journal Article
Publication:	PHYSICAL REVIEW E
Publisher:	AMER PHYSICAL SOC
Additional Information:	Copy right for this article belongs to American Physical Society
Keywords:	OPTICAL-FLOW;SAND
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	14 Jul 2012 08:04
Last Modified:	14 Jul 2012 08:04
URI:	http://eprints.iisc.ac.in/id/eprint/44796

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