Tensile creep behavior of SiCf/SiC ceramic matrix minicomposites |
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| Affiliation: | 1. Ceramic and Polymer Composites Branch, Materials and Structures Division, NASA Glenn Research Center, 21000 Brookpark Road, Mail Stop 106-1, Cleveland, OH 44135, USA;2. Mechanical Engineering Department, Auburn Science & Engineering Center, University of Akron, 302 Buchtel Common, Akron OH 44325, USA;1. Laboratory of Science and Technology on UAV, Northwestern Polytechnical University, Xi’an, 710065, China;2. Xi''an Institute of Space Radio Technology, Xi’an, 710100, China;3. School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China;4. Faculty of Science, Engineering and Computing, Kingston University London, SW15 3DW, UK;1. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, 410073, China;2. Chongyi Zhangyuan Tungsten Co., Ltd, Ganzhou, 341000, China;1. Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei-shi, Tokyo 184-8588, Japan;2. Japan Aerospace Exploration Agency (JAXA), 6-13-1, Osawa, Mitaka-shi, Tokyo 181-0015, Japan;1. School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China;2. Beijing Institute of Structure and Environment Engineering, Beijing 100901, China;3. Department of Materials Science and Engineering of Northwestern Polytechnic University, 710072 Xi’an, Shanxi, China |
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| Abstract: | Single fiber-tow minicomposites represent the major load-bearing element of woven and laminate ceramic matrix composites (CMCs). To understand the effects of fiber type, fiber content, and matrix cracking on tensile creep in SiCf/SiC CMCs, single-tow SiCf/SiC minicomposites with different fiber types and contents were investigated. The minicomposites studied contained either Hi-Nicalon? or Hi-Nicalon? Type S SiC fibers with a boron nitride (BN) interphase and a chemical-vapor-infiltrated-silicon-carbide (CVI-SiC) matrix. Tensile creep was performed at 1200 °C in air. A bottom-up creep modeling approach was applied where creep parameters of the fibers and matrix were obtained separately at 1200 °C. Next, a theoretical model based on the rule of mixtures was derived to model the fiber and matrix creep-time-dependent stress redistribution. Fiber and matrix creep parameters, load transfer model results, and numerical modeling were used to construct a creep strain model to predict creep damage evolution of minicomposites with different fiber types and contents. |
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| Keywords: | Creep Creep load sharing model Total creep strain model Oxidation Fiber creep |
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