Effect of different fiber orientations on compressive creep behavior of siC fiber-reinforced mullite matrix composites |
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| Affiliation: | 1. Korea Institute for Advanced Study, 207-43 Cheongryangri-dong, Dongdaemun-gu, Seoul 130-012, Republic of South Korea;2. Superplastic Nanoscience Laboratory, National Industrial Research Institute of Nagoya Hirate-cho, Kita-ku, Nagoya 462-8510, Japan;3. The State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People''s Republic of China;1. College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, No. 29, Yudao St., Nanjing 210016, PR China;2. Université de Lyon, INSA-Lyon, MATEIS (UMR CNRS 5510), 20 Avenue Albert Einstein, F-69621 Villeurbanne, France;1. Department of Engineering Mechanics, School of Naval Architecture, Ocean and Civil Engineering (State Key Laboratory of Ocean Engineering, Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration), Shanghai Jiao Tong University, Shanghai 200240, China;2. School of Engineering, Brown University, Providence 02912, USA;1. College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China;2. Key Laboratory of In-situ Property-improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, PR China |
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| Abstract: | The compressive creep behavior of monolithic mullite and a composite made of mullite reinforced by 40 vol% SiC fiber were investigated at temperatures from 1100 to 1200°C and under stresses from 5 to 55 MPa in air with a loading direction parallel and perpendicular to the fiber direction. For both situations the composite exhibits better creep resistance than monolithic mullite, although there is a creep anisotropy. The improvement in creep resistance when the fibers are parallel to the loading directions is due to the shedding of the applied stress on the SiC fibers, and the improvement in creep resistance when the fibers are perpendicular to the loading direction occurs because the fibers inhibit the lateral deformation of the mullite matrix along the fibers. The improvement mechanisms of the composites were confirmed further by their creep-recovery study, which indicated that the two types of composite specimens exhibit both an apparent creep-recovery behavior on load removal, due to the relaxation of the residual stress state between the mullite matrix and the SiC fibers after unloading. © |
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