Failure characteristics of ScS-6/Ti-24Al-11Nb composite with a circular hole at room and elevated temperatures. Master's thesis
Technical Report
·
OSTI ID:5832206
Off-axis loading of eight ply, unidirectional specimens with and without a circular hole determined the ultimate tensile strength of SCS-6/Ti-24Al-11Nb composite at temperatures of 25 degrees C and 650 degrees C and fiber orientations of 0 degrees, 15 degrees, 45 degrees. Longitudinal moduli of the tested orientations compared closely to the rule of mixtures calculated values, and strengths compared closely to those predicted by the Tsai-Wu failure theory. The small diameter hole does not act as a stress concentrator, but merely reduces the material's strength in proportion to area loss. This result differs from those predicted by linear finite element analysis and orthotropic stress concentration theory. Radiography, used to detect damage prior to failure, showed no fiber breakage nor matrix cracking. Microscopic examination of the fracture surfaces indicates a weak fiber/matrix interface bond at both room and elevated temperatures. Brittle fracture of fibers and matrix with little fiber pull out occurs at room temperature, while brittle fiber fracture and ductile matrix fracture with greater fiber pull out occurs at elevated temperatures.
- Research Organization:
- Air Force Inst. of Tech., Wright-Patterson AFB, OH (United States). School of Engineering
- OSTI ID:
- 5832206
- Report Number(s):
- AD-A-243869/5/XAB; AFIT/GAE/ENY--91D-8
- Country of Publication:
- United States
- Language:
- English
Similar Records
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Conference
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Thu Dec 31 23:00:00 EST 1987
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OSTI ID:5785103
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Journal Article
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·
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Related Subjects
36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
BRITTLENESS
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
FAILURES
FIBERS
FINITE ELEMENT METHOD
FRACTURE MECHANICS
MATERIALS
MECHANICAL PROPERTIES
MECHANICS
MICROSCOPY
NIOBIUM ALLOYS
NUMERICAL SOLUTION
OPENINGS
SILICON CARBIDES
SILICON COMPOUNDS
STRESSES
SURFACES
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TENSILE PROPERTIES
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
ULTIMATE STRENGTH
YOUNG MODULUS
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
BRITTLENESS
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
FAILURES
FIBERS
FINITE ELEMENT METHOD
FRACTURE MECHANICS
MATERIALS
MECHANICAL PROPERTIES
MECHANICS
MICROSCOPY
NIOBIUM ALLOYS
NUMERICAL SOLUTION
OPENINGS
SILICON CARBIDES
SILICON COMPOUNDS
STRESSES
SURFACES
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TENSILE PROPERTIES
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
ULTIMATE STRENGTH
YOUNG MODULUS