Damage analysis of 2.5D C/C-SiC composites subjected to fatigue loadings |
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| Affiliation: | 1. Powder Metallurgy Research Institute, Central South University, 410083 Changsha, China;2. Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, 28359 Bremen, Germany;3. Center for Environmental Research and Sustainable Technology (UFT), University of Bremen, 28359 Bremen, Germany;4. Ceramic Materials Engineering, University of Bayreuth, 95447 Bayreuth, Germany;5. Polymer Engineering, University of Bayreuth, 95447 Bayreuth, Germany;6. MAPEX - Center for Materials and Processes, University of Bremen, 28359 Bremen, Germany;1. Nanjing University of Aeronautics and Astronautics, Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing 210016, PR China;2. Key Laboratory of Aero-engine Thermal Environment and Structure, Ministry of Industry and Information Technology, PR China;3. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China;1. Science and Technology on Scramjet Laboratory, China Aerodynamics Research and Development Center, Mianyang 621000, China;2. Flight Theory Department, Army Aviation College, Beijing 101116, China;3. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, China;1. Science and Technology on Thermostructure Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, China;2. School of Material Science and Engineering, South China University of Technology, Guangzhou 510630, China;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, PR China;2. Ceramic Materials Engineering, University of Bayreuth, Bayreuth, 95447, Germany;3. College of Metallurgical Engineering, Hunan University of Technology, Zhuzhou, Hunan 412008, PR China |
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| Abstract: | Damage analyses of a ceramic matrix composite during fatigue and quasi-static loads were performed by acoustic emission (A.E.) monitoring. The material studied was a 2.5D C/C-SiC composite produced by chemical vapor infiltration followed by liquid silicon infiltration. The analysis done during the first 200 cycles of a fatigue test showed that the number of A.E. hits is a good parameter for the quantification of damage. Furthermore, the A.E. hit energy was associated with the type of damage. In this sense, the damage developed during the fatigue loading was related to matrix crack initiation, propagation and re-opening, as well as fiber-matrix friction. Quasi-static tests on post-fatigue samples showed that the previous fatigue loadings increased the material`s damage threshold and hindered the development of new damage. Particular attention was given to the sample after 2,000,000 cycles as this sample showed distinct A.E. signals that could be related to fiber debonding. |
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| Keywords: | A. Ceramic-matrix composites (CMCs) B. Fatigue D. Acoustic emission Damage threshold |
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