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Hertzian Contact Damage in Porous Alumina Ceramics
Author(s) -
Latella Bruno A.,
OConnor Brian H.,
Padture Nitin P.,
Lawn Brian R.
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb02940.x
Subject(s) - materials science , indentation , porosity , composite material , ceramic , porous medium , contact mechanics , deformation (meteorology) , compression (physics) , plasticity , stress (linguistics) , finite element method , structural engineering , linguistics , philosophy , engineering
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.