Fatigue properties and fracture analysis of a SiC fiber-reinforced titanium matrix composite |
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| Affiliation: | 1. Physics Department, Dillard University, New Orleans, LA 70122, United States;2. SSS optical Technologies, 515 Sparkman Drive, Huntsville, AL 35816, United States;3. Mathematics & Physics Department, Oakwood University, 7000 Adventist Blvd, Huntsville, AL 35896, United States;4. Chemistry Department, Tulane University, New Orleans, LA 70122, United States;5. Mechanical Engineering Department, University of New Orleans, New Orleans, LA 70148, United States;1. Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, PR China;2. Key Laboratory of Aero-engine Thermal Environment and Structure, Ministry of Industry and Information Technology, Nanjing, 210016, PR China;3. State Key Laboratory of Mechanics and Control Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, PR China |
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| Abstract: | Tension–tension fatigue properties of SiC fiber reinforced Ti–6Al–4V matrix composite (SiCf/Ti–6Al–4V) at room temperature were investigated. Fatigue tests were conducted under a load-controlled mode with a stress ratio 0.1 and a frequency 10 Hz under a maximum applied stress ranging from 600 to 1200 MPa. The relationship between the applied stress and fatigue life was determined and fracture surfaces were examined to study the fatigue damage and fracture failure mechanisms using SEM. The results show that, the fatigue life of the SiCf/Ti–6Al–4V composite decreases substantially in proportion to the increase in maximum applied stress. Moreover, in the medium and high life range, the relationship between the maximum applied stress and cycles to failure in the semi-logarithmic system could be fitted as a linear equation: Smax/μ = 1.381 ? 0.152 × lgNf. Fractographic analysis revealed that fatigue fracture surfaces consist of a fatigued region and a fast fracture region. The fraction of the fatigued region with respect to the total fracture surface decreases with the increase of the applied maximum stresses. |
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| Keywords: | A Fibers A Metal–matrix composites (MMCs) B Fatigue D Fractography |
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