New insight into subcritical rupture of SiC-based filaments at intermediate temperatures (400–900 °C) under air |
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| Affiliation: | 1. Postgraduate Programme in Materials Science and Engineering, University of São Paulo, USP/FZEA, Av. Duque de Caxias Norte, 225, 13635-900, Pirassununga, Brazil;2. Forschungszentrum Jülich, Institute for Energy and Climate Research (IEK-1), 52425, Jülich, Germany;3. Federal University of Alfenas, José Aurelio Vilela, 11999, Cidade Universitária, BR 267, Km 533, Poços de Caldas, MG, 37715-400, Brazil;4. Department of Biosystem Engineering, Faculty of Animal Science and Food Engineering (FZEA), University of São Paulo (USP), 13635-900, Pirassununga, SP, Brazil;1. Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE, School of Mechanical Engineering, Shandong University, Jinan 250061, PR China;2. Key National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan 250061, PR China;3. State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, PR China;4. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, PR China;1. State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi''an Jiaotong University, Xi''an, 710049, China;2. Welding Engineering and Laser Processing Centre, School of Aerospace, Transport and Manufacturing, Cranfield University, Cranfield, MK43 0AL, UK;1. Department of Industrial Engineering, University of Padova, Padova, 35131, Italy;2. Refractories, Ceramics and Building Materials Department, National Research Centre, El-Bohous Str., 12622, Cairo, Egypt;3. Department of Materials Science and Engineering, The Pennsylvania State University, State College, PA, 16801, USA |
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| Abstract: | The delayed failure of SiC fibrous reinforcement has continuously been investigated to warrant the long term performances of Ceramic Matrix Composite (CMC). Chiefly assessed on multifilament tow samples to alleviate some handling difficulties, subcritical crack growth (SCG) parameters are however ruled by structural artifacts which hinder the identification of intrinsic filament behavior. In this paper, we propose to estimate the true filament parameters for 5 fiber types from bundle behavior using a recently communicated Monte Carlo algorithm integrating flaw and stress distributions through a deterministic fracture mechanics law under Paris’ formulation. So computed tow lifetime are broadly dispersed, encompassing raw data, and show a structure-dependent scale effect, revealed by nfilament>ntow where n is the stress exponent. The relationship between SCG coefficient and chemical composition of the substrate is discussed and highlights the major effect of doping elements (Ti or Zr), oxygen or hydrogen content. |
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| Keywords: | SiC fiber Static fatigue Bundle lifetime Filament lifetime Scale effect Delayed failure distribution |
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