Hertzian contact damage in porous alumina ceramics
- Curtin Univ. of Technology, Perth, Western Australia (Australia). Dept. of Applied Physics
- National Inst. of Standards and Technology, Gaithersburg, MD (United States). Materials Science and Engineering Lab.
A study has been made of Hertzian contact damage in porous and dense liquid-phase-sintered aluminas. Indentation stress-strain curves show increasing nonlinearity as the materials become more porous, illustrating an increasing component of quasi-plasticity in the contact damage. Observations of the surface and subsurface damage patterns using a bonded-interface sectioning technique reveal a transition in the Hertzian damage process, from classical tension-driven cone cracks in the high-density material, to distributed shear- and compression-driven subsurface damage and deformation in the porous materials. Strength tests on specimens subjected to cyclic indentations reveal a substantially higher susceptibility to fatigue in the most porous structure.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 509242
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 4 Vol. 80; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of grain size on Hertzian contact damage in alumina
Micromechanics of deformation in porous liquid phase sintered alumina under hertzian contact