Numerical modeling of oxidized C/SiC microcomposite in air oxidizing environments below 800 °C: Microstructure and mechanical behavior

Xu, Yingjie; Pan, Zhejun; Lü, Huan; Zhang, Weihong

doi:10.1016/j.jeurceramsoc.2015.05.039

Cited by 38 publications

(8 citation statements)

References 27 publications

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“…Oxygen will diffuse into the C/SiC composites through cracks and react with the PyC interface and fibers. The calculation formula of the oxidation rate of PyC interface is given by [24] where R c is the reaction rate of PyC interface, k 0 is the constant that represents the rate of reaction, E 0 is the activation energy of reaction, R is the ideal gas constant, T is the temperature, C O 2 is the oxygen concentration. The interfacial parameter (x,y) of the PyC interface component will change from 1 to 1 after stressed oxidation.…”

Section: Oxidation Of Components In the C/sic Compositesmentioning

confidence: 99%

“…In the atmosphere of high temperature (> 900 ℃) and high oxygen pressure, the SiC matrix may undergo passive oxidation with formation of solid oxide [6] which will fill up the matrix cracks and then stop the diffusion of oxygen and the oxidation of carbon [7]. The oxidation of C fibers and PyC interface causes the degradation of fiber/matrix interface and fibers properties, and also changes the stress distribution in the bulk composite system [8,9]. When the residual strength of fibers under tension decreases to the level less than fiber stress, the fibers will fracture.…”

Section: Introductionmentioning

confidence: 99%

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A Progressive Oxidative Damage Model of C/SiC Composites under Stressed Oxidation Environments

et al. 2021

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A progressive oxidative damage model of C/SiC composites, which is based on the oxidation mechanism and mechanical model of C/SiC composites, is presented to simulate the damage process of C/SiC composite under stressed oxidation environments. Firstly, the oxidation failure time of fibers was calculated according to the fiber stress and the fiber strength decline rule under stressed oxidation environments. Secondly, the stress redistribution and crack propagation around fracture fibers were given by combining the fracture position of fibers with the mechanical model, and the crack propagation would cause more fibers to be oxidized. Thirdly, the progressive oxidative damage process of C/SiC composites under stressed oxidation environments was simulated by repeating the cyclic process of fiber oxidation fracture and crack propagation around the fracture fibers. Finally, through the progressive oxidative damage model, the stress-strain curves and fracture morphology of the unidirectional C/SiC composites after stressed oxidation were predicted. The simulation results were correlated well with the experimental results, in terms of stressed oxidation life, stress-strain curve and variation law of fracture morphology, which indicated the reliability of the model.

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Section: Oxidation Of Components In the C/sic Compositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Progressive Oxidative Damage Model of C/SiC Composites under Stressed Oxidation Environments

et al. 2021

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“…It is assumed that each unit cell in the composites has the same deformation mode and that there is no separation or overlap between neighboring unit cells. Therefore, the periodic boundary conditions (PBC) [ 25 , 26 , 27 ] must be applied to the unit cell model. The PBC can be applied using nodes coupling (CP) and constraint equations (CE) defining in ANSYS.…”

Section: Micromechanical Model Of the Unidirectional C/c–sic Compomentioning

confidence: 99%

Optimizing Thermal-Elastic Properties of C/C–SiC Composites Using a Hybrid Approach and PSO Algorithm

Gao

2016

Materials

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Carbon fiber-reinforced multi-layered pyrocarbon–silicon carbide matrix (C/C–SiC) composites are widely used in aerospace structures. The complicated spatial architecture and material heterogeneity of C/C–SiC composites constitute the challenge for tailoring their properties. Thus, discovering the intrinsic relations between the properties and the microstructures and sequentially optimizing the microstructures to obtain composites with the best performances becomes the key for practical applications. The objective of this work is to optimize the thermal-elastic properties of unidirectional C/C–SiC composites by controlling the multi-layered matrix thicknesses. A hybrid approach based on micromechanical modeling and back propagation (BP) neural network is proposed to predict the thermal-elastic properties of composites. Then, a particle swarm optimization (PSO) algorithm is interfaced with this hybrid model to achieve the optimal design for minimizing the coefficient of thermal expansion (CTE) of composites with the constraint of elastic modulus. Numerical examples demonstrate the effectiveness of the proposed hybrid model and optimization method.

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“…Since the as-fabricated micro-cracks in the SiC matrix act as oxygen transport paths, the exposed carbon fibers are susceptible to the oxidation, which leads to continuous decrease of their stiffness and strength. Thus, the successful implementation of C/SiC components in the envisioned applications will depend on accurately determining the effect of oxidation on the mechanical behavior of the composite [9].…”

mentioning

confidence: 99%

Simulation of Degraded Properties of 2D plain Woven C/SiC Composites under Preloading Oxidation Atmosphere

Chen

Sun

et al. 2017

Appl Compos Mater

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In this paper, a numerical model which incorporates the oxidation damage model and the finite element model of 2D plain woven composites is presented for simulation of the oxidation behaviors of 2D plain woven C/SiC composite under preloading oxidation atmosphere. The equal proportional reduction method is firstly proposed to calculate the residual moduli and strength of unidirectional C/SiC composite. The multi-scale method is developed to simulate the residual elastic moduli and strength of 2D plain woven C/SiC composite. The multi-scale method is able to accurately predict the residual elastic modulus and strength of the composite. Besides, the simulated residual elastic moduli and strength of 2D plain woven C/SiC composites under preloading oxidation atmosphere show good agreements with experimental results. Furthermore, the preload, oxidation time, temperature and fiber volume fractions of the composite are investigated to show their influences upon the residual elastic modulus and strength of 2D plain woven C/SiC composites.

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Numerical modeling of oxidized C/SiC microcomposite in air oxidizing environments below 800 °C: Microstructure and mechanical behavior

Cited by 38 publications

References 27 publications

A Progressive Oxidative Damage Model of C/SiC Composites under Stressed Oxidation Environments

A Progressive Oxidative Damage Model of C/SiC Composites under Stressed Oxidation Environments

Optimizing Thermal-Elastic Properties of C/C–SiC Composites Using a Hybrid Approach and PSO Algorithm

Simulation of Degraded Properties of 2D plain Woven C/SiC Composites under Preloading Oxidation Atmosphere

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