Nucleation and growth of cracks in vitreous-bonded aluminum oxide at elevated temperatures
Journal Article
·
· J. Am. Ceram. Soc.; (United States)
The nucleation and growth of cracks was studied at elevated temperatures on a grade of vitreous-bonded aluminium oxide that contained approx. =8 vol% glass at the grain boundaries. Cracks were observed to nucleate within the vitreous phase, close to the tensile surface of the flexural test specimens used in these experiments. Crack nucleation occurred at a strain of approx. =0.08% to 0.12% which corresponded to a crack nucleation time of approx. =35% of the time to failure by creep rupture. Once nucleated, cracks propagated along grain boundaries, as long as the stress for crack propagation was maintained. The crack velocity for cracks that were nucleated by the creep process was found to be linearly proportional to the apparent stress intensity factor, whereas for cracks that were nucleated by indentation, the crack velocity was proportional to the fourth power of the apparent stress intensity factor.
- Research Organization:
- Dept. of Mechanical Engineering, Univ. of Massachusetts, Amherst, MA
- OSTI ID:
- 6656128
- Journal Information:
- J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 69:10; ISSN JACTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL BONDS
CHEMICAL COMPOSITION
CRACK PROPAGATION
CREEP
CRYSTAL STRUCTURE
FRACTURE MECHANICS
GLASS
GRAIN BOUNDARIES
MECHANICAL PROPERTIES
MECHANICS
MICROSTRUCTURE
NUCLEATION
OXIDES
OXYGEN COMPOUNDS
STRAINS
STRESS INTENSITY FACTORS
STRESSES
TEMPERATURE EFFECTS
TENSILE PROPERTIES
THERMAL STRESSES
VERY HIGH TEMPERATURE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL BONDS
CHEMICAL COMPOSITION
CRACK PROPAGATION
CREEP
CRYSTAL STRUCTURE
FRACTURE MECHANICS
GLASS
GRAIN BOUNDARIES
MECHANICAL PROPERTIES
MECHANICS
MICROSTRUCTURE
NUCLEATION
OXIDES
OXYGEN COMPOUNDS
STRAINS
STRESS INTENSITY FACTORS
STRESSES
TEMPERATURE EFFECTS
TENSILE PROPERTIES
THERMAL STRESSES
VERY HIGH TEMPERATURE