Thermomechanical fatigue of ScS-6/(Beta)21-S (0/90)2s composite (Final report). Master's thesis
The objective of this study was to investigate the material behavior of SCS-6/Beta21-S (0/90)2s in a thermomechanical fatigue environment. Samples of the SCS-6/Beta21-S composite were subjected to in-phase and out-of-phase cyclic loading; four samples were tested under in-phase conditions and eight samples were tested under out-of-phase conditions. Stress, temperature, and total strain values were acquired during the test sequence and analyzed for indication of possible trends. Experimental results indicated in-phase specimen possessed shorter fatigue lives then their out-of-phase counterparts above the static first ply failure of the matrix. The out-of-phase specimen showed a shorter fatigue life below the first ply failure. The examination of the strain change, modulus change, fractography, and metallography of the in-phase test specimens suggests a fracture mechanism that is fiber dominated. The investigation of these parameters, for the out-of-phase test specimens, indicates the fracture mechanism may be matrix dominated. Additional analysis, using a linear life fraction model and a cumulative damage model, further suggests two parameters govern the fatigue life of SCS-6/Beta21-S. Both models indicate the maximum stress or strain parameter of the 0 fibers provides reasonable correlation for life prediction and damage accumulation for an in-phase environment. The load range and modulus provide reasonable correlation for the life prediction and damage for out-of-phase test specimen.
- Research Organization:
- Air Force Inst. of Tech., Wright-Patterson AFB, OH (United States). School of Engineering
- OSTI ID:
- 5832133
- Report Number(s):
- AD-A-243932/1/XAB
- Resource Relation:
- Other Information: Thesis (M.S.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SILICON CARBIDES
THERMAL FATIGUE
TITANIUM ALLOYS
COMPOSITE MATERIALS
DAMAGE
FAILURES
FIBERS
FRACTOGRAPHY
LAYERS
MATHEMATICAL MODELS
MATRIX MATERIALS
METALLOGRAPHY
SAMPLING
SERVICE LIFE
STRESSES
TENSILE PROPERTIES
ALLOYS
CARBIDES
CARBON COMPOUNDS
FATIGUE
MATERIALS
MECHANICAL PROPERTIES
SILICON COMPOUNDS
360603* - Materials- Properties