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 PaperOther

9 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 publicationMaterials Structure and Micromechanics of Fracture VII
PublisherTrans Tech Publications
Pages14-21
Number of pages8
ISBN (Print)9783037859346
DOIs
Publication statusPublished - 2014
Externally publishedYes
EventInternational Conference on Materials Structure and Micromechanics of Fracture (MSMF) 2013 - Brno, Czechia
Duration: 1 Jul 20133 Jul 2013
Conference number: 7th
https://www.scientific.net/KEM.592-593 (Proceedings)

Publication series

NameKey Engineering Materials
Volume592-593
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795

Conference

ConferenceInternational Conference on Materials Structure and Micromechanics of Fracture (MSMF) 2013
Abbreviated titleMSMF 2013
Country/TerritoryCzechia
CityBrno
Period1/07/133/07/13
Internet address

Keywords

  • Computed tomography
  • Digital image correlation
  • Hardness
  • Indentation

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