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Optical Engineering

Micromechanical analysis of inclusions in particulate media using digital photo stress analysis tomography
Author(s): Simon Joseph Antony; Osas Imafidon; Thabit Barakat
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Paper Abstract

An experimental study aimed at sensing the stress distribution characteristics of inclusions inside particulate assemblies subjected to axial compaction is presented. The particulate assemblies are made of powders and grains, in which photoelastic inclusions are embedded along the central axis of the assemblies at different elevations. Digital photo stress analysis tomography is used to obtain the contours of maximum shear-stress distribution and the direction of major principal stress within the inclusions under the external loading. Using this, an analysis is performed for understanding the implications of using Hertz theory based on discrete element modeling for simulating stresses in relatively big inclusions surrounded by particulates. In the case of the inclusions surrounded by the grains, the location at which the peak value in maximum shear stresses occurs within the inclusions deviates from that of Hertzian analysis. This effect is dominant in the case of inclusions residing close to the loading surface. Unlike granular materials, shear-stress distribution characteristics of inclusions in powder surroundings tend to display continuum-like behavior under external compression and points to the need for a deeper understanding of the effects of the surrounding materials in particulate beds with inclusions.

Paper Details

Date Published: 26 February 2015
PDF: 7 pages
Opt. Eng. 54(8) 081202 doi: 10.1117/1.OE.54.8.081202
Published in: Optical Engineering Volume 54, Issue 8
Show Author Affiliations
Simon Joseph Antony, Univ. of Leeds (United Kingdom)
Osas Imafidon, Univ. of Leeds (United Kingdom)
Thabit Barakat, King Saud Univ. (Saudi Arabia)


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