High-temperature failure of polycrystalline alumina. III. Failure times

Journal Article · Thu Nov 01 04:00:00 EST 1984 · J. Am. Ceram. Soc.; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1984.tb19513.x· OSTI ID:5329457

Johnson, S M; Dalgleish, B J; Evans, A G

High-temperature failure data have been obtained for two polycrystalline aluminas, revealing a strongly stress-dependent failure time. The observed stress dependence has been compared with the dependence predicted by models of the nucleation, growth, and coalescence stages of failure. Only models of the coalescence phase indicate sufficient nonlinearity to be a plausible explanation of the data. Further observations and measurements of coalescence, involving continuous crack nucleation and shear-band formation, are identified as requirements for further understanding of the rupture process.

• Research Organization: Lawrence Berkeley Lab., CA
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5329457
• Journal Information: J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 67:11; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CRACK PROPAGATION
CRACKS
CREEP
FAILURE MODE ANALYSIS
FAILURES
HIGH TEMPERATURE
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
STRESSES
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS