Porosity and geometry control ductile to brittle deformation in indentation of porous solids

Yadav, Shwetabh and Saldana, Christopher and Murthy, Tejas G (2016) Porosity and geometry control ductile to brittle deformation in indentation of porous solids. In: INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, 88-89 . pp. 11-16.

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Abstract

We report a series of plane strain wedge indentation experiments on a model porous brittle solid (soft rock) and study the effect of porosity and the indenter geometry on the mechanics of indentation. A series of images of the region surrounding the indenter were captured during indentation and were analysed using a particle image velocimetry algorithm. From the image analyses, deformation parameters were analysed as functions of porosity, including velocity fields and localization features such as compaction bands and fractures. The initiation of fracture during indentation was observed in the transition from brittle to ductile behaviour as a function of indentation depth. Higher ductility of the rock during indentation was observed for samples of high porosity and for indentation utilizing sharper wedges. The implications of these results for controlling deformation and fracture in rock drilling by tool geometry and rock porosity control are briefly discussed. (C) 2016 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	Copy right for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Keywords:	Indentation; Porous solids; Deformation; Image analysis; Compaction bands
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	22 Jun 2016 05:23
Last Modified:	22 Jun 2016 05:23
URI:	http://eprints.iisc.ac.in/id/eprint/54036

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