Optimization and Reliability Analysis of 2.5D C/SiC Composites Turbine Stator Vane
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Optimization and Reliability Analysis of 2.5D C/SiC Composites Turbine Stator Vane Zhigang Sun & Chunyuan Kong & Xuming Niu & Yingdong Song & Xianqiao Wang
Received: 9 December 2013 / Accepted: 12 December 2013 # Springer Science+Business Media Dordrecht 2014
Abstract This paper presents a feasible and efficient methodology to design 2.5D C/SiC composites vane system. To better represent the architecture of 2.5D C/SiC composites, here we define five geometric parameters to describe its microstructure based on the optical photomicrographs. The double scale model for mechanical properties of 2.5D C/SiC composites has been presented to provide a reliable validation with the experimental results. Meanwhile, Monte Carlo (MC) simulation method has been employed to investigate the stochastic behavior of 2.5D C/SiC composites mechanical properties. MC simulation results show that mechanical properties of 2.5D C/SiC composites heavily depends on the stochastic behavior of components and the microstructure of 2.5D composites. To fully explore the potential of 2.5D C/SiC composite, finally we present a vane optimization model and investigate its reliability by integrating the analytical model for mechanical properties with the finite element model analysis. These findings provide an effective method to assess the risk of vane design. Keywords 2.5D C/SiC composites . Optimization . Reliability analysis . Mechanical properties . Safety factor
1 Introduction Owing to its high strength and toughness, composite materials have enjoyed the great popularity in a variety of applications, such as structural materials for aerospace industry, internal chambers and thermal components in aircraft engine [1]. To broaden the full potentiality of composite materials, optimal design has been employed to maximize its material properties, especially in laminated composite. Kim [2] developed a kind of optimal method for tapered composite laminates by taking into account the discrete ply angles and the number of Z. Sun (*) : C. Kong : X. Niu : Y. Song College of Energy and Power Engineering and Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing, People’s Republic of China 210016 e-mail: [email protected] X. Wang College of Engineering, University of Georgia, Athens, GA 30602, USA
Appl Compos Mater
plies in each patch. Liu [3] maximized the buckling load of laminate with discrete ply angles by utilizing standard genetic algorithms(GA) and permutation GA. Zhao [4] proposed twolevel layout optimization strategy for large-scale composite wing structures. By considering the uncertainty of parameters, Eamon [5] combined the analysis reliability with sizing optimization methodology to investigate composite advanced submarine sail structure. Ceramic composites, as one of the outstanding composites, have been plagued by the unpredicted micro-crack of matrix and unstable thermal-mechanical properties. Puglia [6] demonstrated that defects of ceramic composites such as microcracks an
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