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 language | English |
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Title of host publication | Materials Structure and Micromechanics of Fracture VII |
Publisher | Trans Tech Publications |
Pages | 14-21 |
Number of pages | 8 |
ISBN (Print) | 9783037859346 |
DOIs | |
Publication status | Published - 2014 |
Externally published | Yes |
Event | International Conference on Materials Structure and Micromechanics of Fracture (MSMF) 2013 - Brno, Czechia Duration: 1 Jul 2013 → 3 Jul 2013 Conference number: 7th https://www.scientific.net/KEM.592-593 (Proceedings) |
Publication series
Name | Key Engineering Materials |
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Volume | 592-593 |
ISSN (Print) | 1013-9826 |
ISSN (Electronic) | 1662-9795 |
Conference
Conference | International Conference on Materials Structure and Micromechanics of Fracture (MSMF) 2013 |
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Abbreviated title | MSMF 2013 |
Country/Territory | Czechia |
City | Brno |
Period | 1/07/13 → 3/07/13 |
Internet address |
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Keywords
- Computed tomography
- Digital image correlation
- Hardness
- Indentation