Matrix cracking in unidirectional ceramic matrix composites under quasi-static and cyclic loading |
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| Affiliation: | 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. Nanjing Forestry University, College of Chemical Engineering, Nanjing 210016, PR China;3. Key Laboratory of Aero-engine Thermal Environment and Structure, Ministry of Industry and Information Technology, Nanjing 210016, PR China;4. State Key Laboratory of Mechanics and Control Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China;1. Key Laboratory of Aero-engine Thermal Environment and Structure, Ministry of Industry and Information Technology, 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. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China;1. School of Astronautics, Beihang University, Beijing 100191, China;2. Beijing Institute of Structure & Environment Engineering, Beijing 100191, China;3. Xi’an Institute of Modern Control Technology, Xi’an 710065, China;4. College of Aerospace Engineering, Chongqing University, Chongqing 400044, China;1. CEA, DEN, DMN, SRMA, 91191 Gif-sur-Yvette Cedex, France;2. Université Paris-Est, Laboratoire Navier (UMR 8205), CNRS, ENPC, IFSTTAR, F-77455 Marne-la-Vallée, France;3. Mines ParisTech, Centre des matériaux (CNRS UMR 7633), BP 87, 91003 Evry Cedex, France;1. University of Akron, Mechanical Engineering, Akron, United States;2. Scaled Composites, Mojave, CA, United States |
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| Abstract: | Experimental data associated with the development of matrix cracks in unidirectional continuous silicon carbide fibre/calcium alumino-silicate matrix laminates under quasi-static loading are presented, including crack density, residual strain and hysteresis behaviour as functions of applied stress. Simple models are developed, based on an assumption of purely frictional load transfer between the fibre and matrix, which describe reasonably well the quasi-static stress-strain behaviour in the presence of cracks. Under tension-tension mechanical fatigue cycling it is found that the crack density stabilises at a relatively early stage in the test. Based on the quasi-static model, the changes in fatigue hysteresis loops on fatigue cycling are interpreted in terms of a reduction in the effective frictional interfacial shear stress. |
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