Apparent enhanced fatigue resistance under cyclic tensile loading for HIPed silicon nitride
- Univ. of Washington, Seattle, WA (United States). Dept. of Mechanical Engineering
- Oak Ridge National Lab., TN (United States)
- Oak Ridge Inst. for Science and Education, TN (United States)
Cyclic tensile loading tests of a commercial HIPed silicon nitride at elevated temperatures have indicated apparent enhanced fatigue resistance compared to static tensile loading tests under similar test conditions. At 1,150C, stress rupture results plotted as maximum stress versus time to failure did not show significant differences in failure behavior between static, dynamic, or cyclic loading conditions, with all failures originating from preexisting defects (slow crack growth failures). At 1,260C, the stress rupture results showed pronounced differences between static, dynamic, and cyclic loading conditions. Failures at low static stresses (<175 MPa) originated from environmentally assisted (oxidation) and generalized creep damage, while failures at similar times but much greater (up to 2x) cyclic stresses originated from preexisting defects (slow crack growth failures). At 1,370C, stress rupture results did not show as pronounced differences between static, dynamic, and cyclic loading conditions, with most failures originating from environmentally assisted (oxidation) and generalized creep damage.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6301438
- Journal Information:
- Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 76:3; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CHALCOGENIDES
CHEMICAL REACTIONS
CRACK PROPAGATION
CREEP
DATA
EXPERIMENTAL DATA
FABRICATION
FAILURE MODE ANALYSIS
FAILURES
FATIGUE
HOT PRESSING
INFORMATION
MATERIALS TESTING
MATERIALS WORKING
MECHANICAL PROPERTIES
MECHANICAL TESTS
NITRIDES
NITROGEN COMPOUNDS
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
PRESSING
RUPTURES
SILICON COMPOUNDS
SILICON NITRIDES
STATIC LOADS
STRESSES
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
TENSILE PROPERTIES
TESTING
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES