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Study on toughening mechanisms of pyrolytic carbon interface layer in Cf/ZrB2-SiC composites using in-situ tensile experimental and numerical methods
Affiliation:1. Materials Department, University of California, Santa Barbara, Engineering II, Santa Barbara, CA, 93106, USA;2. Department of Mechanical Engineering, University of California, Santa Barbara, Engineering II, Santa Barbara, CA, 93106, USA;3. NASA Glenn Research Center (GRC), 21000 Brookpark Road, Cleveland, OH, 44135, USA;4. Department of Materials Science and Engineering, University of Michigan, 2300 Hayward St, Ann Arbor, MI, 48109, USA;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. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, 710072, China;2. Institut für Materialwissenschaft, Technische Universität Darmstadt, Otto-Berndt-Straße 3, D-64287, Darmstadt, Germany;1. Science and Technology on Advanced Composites in Special Environments Key Laboratory, Harbin Institute of Technology, Harbin 150080, China;2. Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China;1. Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin, 150001, PR China;2. Science and Technology on Advanced Composites in Special Environments Key Laboratory, Harbin Institute of Technology, Harbin, 150001, PR China
Abstract:The toughening mechanism in continuous fiber toughened ZrB2-SiC ceramic matrix (Cf/ZrB2-SiC) composites was studied upon introduction of pyrolytic carbon coating at the fiber/matrix interface. The real-time deformation behavior, surface crack initiation and evolution of Cf/ZrB2-SiC composites under tensile load were studied using in-situ scanning electron microscopy (SEM) to determine the typical damage modes and toughening mechanisms. A refined microscopic representative volume element (RVE) inserting the cohesive zone elements was established to study the PyC interface layer damage by using finite element method. It was found that PyC interface layer damage induced by thermal residual stress (TRS) was one of critical factors affecting the mechanical performance of the Cf/ZrB2-SiC composites. The critical thickness of the interface layer was also further determined by analyzing the effect of interface layer thickness on the distribution of TRS, which can guide the design of PyC interface layer for manufacturing the Cf/ZrB2-SiC composites.
Keywords:In-situ test  Toughening mechanisms  Damage propagation  Thermal residual stress
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