Hertzian Contact Damage in Porous Alumina Ceramics

A study has been made of Hertzian contact damage in porous and dense liquid‐phase‐sintered aluminas. Indentation stressstrain curves show increasing nonlinearity as the materials become more porous, illustrating an increasing component of “quasi‐plasticity” in the contact damage. Observations of the...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the American Ceramic Society 1997-04, Vol.80 (4), p.1027-1031
Main Authors: Latella, Bruno A., OConnor, Brian H., Padture, Nitin P., Lawn, Brian R.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Miscellaneous
Technical ceramics
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A study has been made of Hertzian contact damage in porous and dense liquid‐phase‐sintered aluminas. Indentation stressstrain 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.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1997.tb02940.x