3D studies of indentation by combined X-ray tomography and digital volume correlation

Mahmoud Mostafavi, Yelena Vertyagina, Christina Reinhard, Robert Bradley, Xia Jiang, Marina Galano, James Marrow

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

6 Citations (Scopus)

Abstract

Hardness testing obtains material properties from small specimens via measurement of load-displacement response to an imposed indentation; it is a surface characterisation technique so, except in optically transparent materials, there is no direct observation of the assumed damage and deformation processes within the material. Three-dimensional digital image correlation ('digital volume correlation') is applied to study deformation beneath indentations, mapping the relative displacements between high-resolution synchrotron X-ray computed tomographs (0.9 μm voxel size). Two classes of material are examined: ductile aluminium-silicon carbide composite (Al-SiC) and brittle alumina (Al2O3). The measured displacements for Hertzian indentation in Al-SiC are in good agreement with an elastic-plastic finite element simulation. In alumina, radial cracking is observed beneath a Vickers indentation and the crack opening displacements are measured, in situ under load, for the first time. Potential applications are discussed of this characterization technique, which does not require resolution of microstructural features.

Original languageEnglish
Title of host publicationKey Engineering Materials
Pages14-21
Number of pages8
Volume592-593
DOIs
Publication statusPublished - 2014
Event7th International Conference on Materials Structure and Micromechanics of Fracture, MSMF 2013 - Brno, Czech Republic
Duration: 1 Jul 20133 Jul 2013

Publication series

NameKey Engineering Materials
Volume592-593
ISSN (Print)10139826

Conference

Conference7th International Conference on Materials Structure and Micromechanics of Fracture, MSMF 2013
CountryCzech Republic
CityBrno
Period1/07/133/07/13

Keywords

  • Computed tomography
  • Digital image correlation
  • Hardness
  • Indentation

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