Special Section on Digital Photoelasticity: Advancements and Applications

Micromechanical analysis of inclusions in particulate media using digital photo stress analysis tomography

[+] Author Affiliations
Simon Joseph Antony, Osas Imafidon

University of Leeds, Institute of Particle Science and Engineering, School of Chemical and Process Engineering, Leeds, LS2 9JT, United Kingdom

Thabit Barakat

King Saud University, College of Science, Department of Physics and Astronomy, PO Box 2455, Riyadh, Saudi Arabia

Opt. Eng. 54(8), 081202 (Feb 26, 2015). doi:10.1117/1.OE.54.8.081202
History: Received July 25, 2014; Revised August 29, 2014; Accepted September 2, 2014
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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.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Simon Joseph Antony ; Osas Imafidon and Thabit Barakat
"Micromechanical analysis of inclusions in particulate media using digital photo stress analysis tomography", Opt. Eng. 54(8), 081202 (Feb 26, 2015). ; http://dx.doi.org/10.1117/1.OE.54.8.081202


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