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High‐Temperature Bridging in a Vitreous Bonded Alumina
Author(s) -
Webb James E.,
Jakus Karl,
Ritter John E.
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.tb02860.x
Subject(s) - bridging (networking) , materials science , composite material , cantilever , wedge (geometry) , bridge (graph theory) , displacement (psychology) , fracture (geology) , geometry , mathematics , medicine , psychology , computer network , computer science , psychotherapist
The load supported by crack wake bridges was studied in glassy alumina at 1240°C using short double cantilever beam specimens with a rear notch wedge. Direct observation of fracture surfaces revealed the sizes and shapes of the high‐temperature bridges. The bridged area was stochastic in nature but there was a clear trend toward decreased area bridged with increasing crack opening displacement consistent with existing models. Fracture surface observations on specimens without a rear notch were compared to bridge distributions in wedged specimens. Because of the complex bridge morphology the load supported by the bridges cannot be modeled as viscous uniaxial columns.