Comparison of cyclic fatigue behavior between C/SiC and SiC/SiC ceramic-matrix composites at elevated temperatures using hysteresis dissipated energy

2016 ◽  
Vol 150 ◽  
pp. 41-52 ◽  
Author(s):  
Li Longbiao
Keyword(s):  
Elevated Temperatures ◽  
Fatigue Behavior ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Cyclic Fatigue ◽  
Dissipated Energy ◽  
Matrix Composites ◽  
Sic Ceramic

Comparisons of cyclic fatigue hysteresis between C/SiC and SiC/SiC ceramic–matrix composites with different fiber preforms at room and elevated temperatures

2020 ◽  
Vol 54 (20) ◽  
pp. 2723-2737
Author(s):  
Li Longbiao
Keyword(s):  
Room Temperature ◽  
Elevated Temperatures ◽  
Ceramic Matrix Composites ◽  
Cyclic Fatigue ◽  
Inert Atmosphere ◽  
Dissipated Energy ◽  
Matrix Composites ◽  
Cycle Number ◽  
Air Atmosphere ◽  
Sic Ceramic

In this paper, the cyclic fatigue hysteresis of carbon fiber reinforced silicon carbide (C/SiC) and SiC/SiC ceramic–matrix composites with different fiber preforms at room and elevated temperatures is investigated. The evolution of fatigue hysteresis dissipated energy versus applied cycle number for unidirectional C/SiC ( σmax = 240 MPa at room temperature and σmax = 250 MPa at 800℃ in air atmosphere), cross-ply C/SiC ( σmax = 105 MPa at room temperature and 800℃ in air atmosphere), 2D C/SiC ( σmax = 387 and 425 MPa at room temperature), 2.5D C/SiC ( σmax = 180 MPa at room temperature, σmax = 140 MPa at 800℃ in air atmosphere, and σmax = 230 MPa at 600℃ in inert atmosphere), 2D SiC/SiC ( σmax = 130 MPa at 600℃, 800℃, and 1000℃ in inert atmosphere, σmax = 80 MPa at 1000℃ in air atmosphere, σmax = 100 MPa at 1000℃ in steam atmosphere, σmax = 140 MPa at 1200℃ in air and in steam atmospheres, σmax = 90, 120 MPa at 1300℃ in air atmosphere), and 3D SiC/SiC ( σmax = 100 MPa at 1300℃ in air atmosphere) is analyzed. The change rate of the fatigue hysteresis dissipated energy between C/SiC and SiC/SiC composites is compared. The fatigue hysteresis dissipated energy decreases with applied cycle number for unidirectional, and cross-ply C/SiC composite at 800℃ in air, and 2.5D C/SiC composite at 600℃ in inert; and the fatigue hysteresis dissipated energy increases with applied cycle number for 2.5D C/SiC composite at 800℃ in air, 2D SiC/SiC composite at 600℃, and 800℃ in inert.

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