Near-tip mechanics of stress-induced microcracking in brittle materials
Journal Article
·
· J. Am. Ceram. Soc.; (United States)
A continuum-mechanics description of stress-induced microcracking was developed. Modulus-reduction effects due to microcracking are taken into account through the model of Budiansky and O'Connell. This is used in conjunction with a modified microcracking criterion that stems from the work of Evans and Fu. The resulting constitutive law for a microcracking material was used in finite-element calculations to study the near-tip stress and strain fields and the size and shape of a small-scale damaged zone for a stationary mode I crack in an elastic body. The finite-element results for the stationary crack are used to predict asymptotic toughening values which correspond to a fully developed wake of microcracked material for a propagating crack. Substantial toughening can result. In contrast, the microcracking zone for a stationary crack is thought to make little or no contribution to material toughening. The theoretical results are discussed in the context of experimental observations for zirconia-toughened alumina.
- Research Organization:
- Dept. of Materials and Dept. of Mechanical Engineering, Univ. of California, Santa Barbara, CA (US)
- OSTI ID:
- 6360174
- Journal Information:
- J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 71:6; ISSN JACTA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mechanics of microcrack toughening in ceramics
Transformation, microcrack, and thermal residual stress as interactive processes in ZrO[sub 2]-toughened Al[sub 2]O[sub 3], simulated by the finite element method
A numerical analysis of crack growth in microcracking brittle solids
Technical Report
·
Thu Sep 01 00:00:00 EDT 1983
·
OSTI ID:5598248
Transformation, microcrack, and thermal residual stress as interactive processes in ZrO[sub 2]-toughened Al[sub 2]O[sub 3], simulated by the finite element method
Journal Article
·
Mon Aug 01 00:00:00 EDT 1994
· Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)
·
OSTI ID:7103958
A numerical analysis of crack growth in microcracking brittle solids
Journal Article
·
Mon Oct 31 23:00:00 EST 1994
· Acta Metallurgica et Materialia; (United States)
·
OSTI ID:7184370
Related Subjects
36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ASYMPTOTIC SOLUTIONS
BRITTLENESS
CALCULATION METHODS
CHALCOGENIDES
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
CRACK PROPAGATION
CRACKING
CRYSTAL STRUCTURE
DATA
DECOMPOSITION
EXPERIMENTAL DATA
FINITE ELEMENT METHOD
INFORMATION
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
MICROSTRUCTURE
NUMERICAL DATA
NUMERICAL SOLUTION
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
STRESS ANALYSIS
TENSILE PROPERTIES
THEORETICAL DATA
THERMOCHEMICAL PROCESSES
ZIRCONIUM ADDITIONS
ZIRCONIUM ALLOYS
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ASYMPTOTIC SOLUTIONS
BRITTLENESS
CALCULATION METHODS
CHALCOGENIDES
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
CRACK PROPAGATION
CRACKING
CRYSTAL STRUCTURE
DATA
DECOMPOSITION
EXPERIMENTAL DATA
FINITE ELEMENT METHOD
INFORMATION
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
MICROSTRUCTURE
NUMERICAL DATA
NUMERICAL SOLUTION
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
STRESS ANALYSIS
TENSILE PROPERTIES
THEORETICAL DATA
THERMOCHEMICAL PROCESSES
ZIRCONIUM ADDITIONS
ZIRCONIUM ALLOYS