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Measurement of Nonsymmetric Creep in Al 2 O 3 with a Glass Phase
Author(s) -
Fett Theo
Publication year - 1992
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.1151-2916.1992.tb04249.x
Subject(s) - creep , deflection (physics) , materials science , composite material , flexural strength , ceramic , phase (matter) , bending , knoop hardness test , atmospheric temperature range , forensic engineering , optics , microstructure , thermodynamics , indentation hardness , chemistry , physics , engineering , organic chemistry
To check the development of nonsymmetry in bending creep tests an Al 2 O 3 ceramic containing a glass phase is investigated in interrupted creep tests. The symmetric part of the strain is measured by the deflection and the nonsymmetric part is obtained by length measurements between two Knoop indentations situated at the centerline of bending bars. It is observed that nonsymmetry in creep occurs not only in the secondary creep range but also in the primary range.