Multi-Scale Modeling and Experimental Study of the Strength of Plain-Woven SiC/SiC Composites
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Multi-Scale Modeling and Experimental Study of the Strength of Plain-Woven SiC/SiC Composites Xiguang Gao 1,2
& Hongnian Dong
1,2
& Sheng Zhang
1,2
& Yingdong Song
1,2,3
Received: 23 March 2019 / Accepted: 12 August 2019/ # Springer Nature B.V. 2019
Abstract The strength of plain-woven SiC/SiC composites was predicted with the multi-scale method. Firstly, a three-dimensional unit cell was used to characterize the geometric structure of plainwoven SiC/SiC composites. Secondly, the yarns were seen as minicomposites, whose axial mechanical properties were obtained by the shear-lag model, and the fiber defect model was adopted to simulate the failure process of minicomposites. The strength of plain-woven SiC/ SiC composites predicted with the multi-scale method is in good agreement with the experimental result. Besides, the effects of heat treatment and load-carrying capacity of broken fiber on the strength of plain-woven SiC/SiC composites were evaluated, and the effect of woven geometry structure was also evaluated. Keywords Ceramic matrix composites . Failure . Finite element analysis . Heat treatment . Strength . Multi-scale
1 Introduction Fiber-reinforced ceramic matrix composites (CMCs) not only inherit ceramics’ outstanding properties, such as high strength, high modulus, high hardness, chemically inert and high melting temperature but also overcome the brittleness and notch sensitivity of ceramics. Given
* Xiguang Gao [email protected] * Yingdong Song [email protected]
1
Key Laboratory of Aero-engine Thermal Environment and Structure, Ministry of Industry and Information Technology, Nanjing 210016, People’s Republic of China
2
Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, 29 Yudao St, Nanjing 210016, People’s Republic of China
3
State Key Laboratory of Mechanics and Control Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, People’s Republic of China
Applied Composite Materials
the excellent properties, CMCs have been applied to aero-engine, automobile brake system, and other modern engineering structures [1–3]. According to the yarn structure, CMCs can be divided into unidirectional, cross-ply, and woven structures. Compared with unidirectional and cross-ply CMCs, woven CMCs possess better delamination resistance and impact tolerance, and have become the main form in engineering applications. Hence, the strength prediction of woven CMCs is an essential and critical task in the design of CMCs structures. Curtin [4, 5] was the first to present a theory incorporating the statistical nature of the fiber strength and the presence of fiber/matrix sliding to predict the ultimate tensile strength of CMCs. Although the theory can only be applied to unidirectional CMCs, it also gives guidance for strength prediction of woven CMCs. Although woven CMCs possess complex geometric structures, many significant signs of progress in modeling the mechanical beh
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