Micromechanics-based simulation of B4C-TiB2 composite fracture under tensile load |
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| Affiliation: | 1. Department of Aerospace Engineering, the Pennsylvania State University, University Park, PA16802, USA;2. NASA Glenn Research Center, Cleveland, OH 44135, USA;3. Applied Research Laboratory, the Pennsylvania State University, University Park, PA 16802, USA;1. CNR-ISTEC, Inst. of Science and Technology for Ceramics, Via Granarolo 64, 48018 Faenza, Italy;2. INFN – Laboratori Nazionali di Legnaro, Viale dell’Università 2, 35020 Legnaro, Italy;3. Department of Industrial Engineering, University of Padova, Via Venezia 1, 35131 Padova, Italy;1. Department of Physics, Faculty of Sciences and Letters, Çukurova University, 01330 Adana, Turkey;2. INMA (CSIC-Universidad de Zaragoza), Maria de Luna, 50018 Zaragoza, Spain;1. State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China;2. Shenzhen Research Institute, Central South University, Shenzhen 518057, China;1. School of Materials Science and Engineering, Harbin Institute of Technology (Weihai), Weihai 264209, PR China;2. School of Science, Lanzhou University of Technology, Lanzhou 730050, PR China;3. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;4. School of Materials Science and Engineering, Shandong University of Technology, Zibo 255049, Shandong, PR China;1. National Research Council of Italy (CNR) - Institute of Science and Technology for Ceramic Materials (ISTEC), Via Granarolo 64, I-48018 Faenza, RA, Italy;2. National Research Council of Italy (CNR) - Institute for Biological Resources and Marine Biotechnologies (IRBIM), Largo Fiera della Pesca 2, I-60125 Ancona, AN, Italy |
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| Abstract: | Micromechanics modeling was performed to study the effects of thermal residual stress, weak interphases, TiB2 volume fraction and particle size on the mechanical responses and fracture behaviors of B4C-TiB2 composites. Experimentally observed fracture behaviors including micro-cracking and crack deflection were successfully captured. The weak interphases at B4C-TiB2 boundaries and the thermal residual stress induced during cooling by the large CTE mismatch between B4C and TiB2 were identified as two major factors to promote micro-cracking that caused the enhanced progressive failure behavior. Micro-cracking was enhanced with higher TiB2 volume fraction due to higher fraction of weak interphase and material affected by thermal residual stress. Meanwhile, micro-cracking behaviors exhibited limited change with varying TiB2 particle sizes. This modeling study successfully captured the main fracture behaviors and their trends by varying micro-structures of B4C-TiB2 composites and can potentially aid microstructure design of tougher B4C-TiB2 composites in the future. |
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| Keywords: | Boron carbide Fracture toughness Micromechanics Modeling Micro-crack toughening |
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