In-situ tensile damage and fracture behavior of PIP SiC/SiC minicomposites at room temperature |
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| Affiliation: | 1. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, Hunan, 410083, PR China;2. Hunan Province Key Laboratory of New Specialty Fibers and Composite Material, Central South University, Changsha, Hunan, 410083, PR China;3. Powder Metallurgy Research Institute, Central South University, Changsha, Hunan 410083, PR China;4. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, No. 800, Dongchuan Road, Minhang District, Shanghai 200240, PR China;5. College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, No. 29, Jiangjun Ave., Nanjing 211106, PR China;1. Rolls-Royce Plc, P.O Box 31, Derby, DE24 8BJ, UK;2. Rolls-Royce Corporation, 546 South Meridian St, Indianapolis, USA;3. Intertek, Derby, DE24 8BJ, UK;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. Nanjing Forestry University, College of Chemical Engineering, Nanjing 210016, PR China;3. AECC Commercial Aircraft Engine Co., Ltd., Shanghai 200241, 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 |
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| Abstract: | In-situ tensile damage and fracture behavior of original SiC fiber bundles, processed and uncoated SiC fiber bundles, SiC fiber bundle with PyC interphase, SiC/SiC minicomposites without/with PyC interphase are analyzed. Relationships between load-displacement curves, stress-strain curves, and micro damage mechanisms are established. A micromechanical approach is developed to predict the stress-strain curves of SiC/SiC minicomposites for different damage stages. Experimental tensile stress-strain curves of two different SiC fiber reinforced SiC matrix without/with interphase are predicted. Evolution of composite’s tangent modulus, interface debonding fraction, and broken fiber fraction with increasing applied stress is analyzed. For the BX? and Cansas-3303? SiC/SiC minicomposite with interphase, the composite’s tangent modulus decreased with applied stress especially approaching tensile fracture; the interface debonding fraction increased with applied stress, and the composite’s tensile fracture occurred with partial interface debonding; and the broken fiber fraction increased with applied stress, and most of fiber’s failure occurred approaching final tensile fracture. |
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| Keywords: | Ceramic-matrix composites (CMCs) Minicomposite In-situ Matrix fragmentation Interface debonding Fiber pullout |
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