1 Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 2 State Key Laboratory of Mechanics and Control of Mechanics Structure, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
The tension-compression fatigue behavior for needled C/SiC composite at room temperature was studied and compared with the properties under tension-tension fatigue loading. The results show that the tension-compression fatigue strength of the needled C/SiC composites is slightly lower than that under tension-tension loading. Hysteresis phenomenon can be observed under both loading stations. The loops move to the right and their slopes and areas increase as the cycles increase. The microstructure of the composites and the morphology of the fractured surfaces of the failure specimens can be observed by SEM. It shows that in addition to the matrix cracking and interface debonding, which is vertical to the loading direction, the meso failure mechanism under tension-compression cyclic loading also includes matrix cracking and interlayer delamination parallel to loading direction, which can make the stress state within fibers worse and finally weakens the fatigue strength of needled C/SiC composites under tension-compression loading.
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