Fatigue life modeling in titanium matrix composites
Conference
·
OSTI ID:89875
- Wright Lab., Wright-Patterson AFB, OH (United States)
Damage summation models are developed for predicting the fatigue life of titanium matrix composites under a variety of loading conditions. Isothermal fatigue as a function of temperature, frequency, stress ratio, and superimposed hold time is modeled by considering cycle- and time-dependent components of damage separately and adding the effects. Thermomechanical fatigue life is modeled by considering fiber and matrix stresses and summing the damage due to each mechanism. A procedure is developed to model both isothermal and thermomechanical fatigue utilizing micromechanical stresses for cyclic damage and applied stresses for time-dependent damage. The models are applied to titanium matrix composites reinforced with silicon carbide fibers. The modeling correlates well with experimental data and is consistent with mechanisms of failure observed through fractography.
- OSTI ID:
- 89875
- Report Number(s):
- CONF-9409291--; ISBN 1-56676-220-0
- Country of Publication:
- United States
- Language:
- English
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