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A method for predicting the cracking stress of a steady-state matrix of a woven ceramic-based composite material by considering the environmental influence

A technology of matrix cracking and composite materials, which is applied in prediction, data processing applications, special data processing applications, etc., and can solve problems such as unsatisfactory accuracy of prediction results

Pending Publication Date: 2019-04-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Application Information

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Problems solved by technology

For example, Li Longbiao et al. provided a method for predicting the steady-state matrix cracking stress of unidirectional ceramic matrix composites (see Modeling first matrix cracking stress of fiber-reinforced ceramic-matrix composites considering fiber fracture. Theoretical and Applied Fracture Mechanics 2017; 92:24-32. ), but the accuracy of the prediction results is not satisfactory

Method used

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  • A method for predicting the cracking stress of a steady-state matrix of a woven ceramic-based composite material by considering the environmental influence
  • A method for predicting the cracking stress of a steady-state matrix of a woven ceramic-based composite material by considering the environmental influence
  • A method for predicting the cracking stress of a steady-state matrix of a woven ceramic-based composite material by considering the environmental influence

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Embodiment 1

[0234] Taking two-dimensional braided ceramic matrix composites (2D C / SiC) as test samples, the cracking stress of the steady-state matrix was predicted after oxidation for 4 hours and 6 hours at a high temperature of 700 °C in an air environment.

[0235] The sample parameters are as follows: V f (%)=40, χ=0.5, E f =200GPa,E m =350GPa,G m =145GPa, r f = 3.5 μm, ξ d =1.2J / m 2 , τ 0_i =6MPa, τ 0_f =1MPa, α rf =-0.38×10 -6 / °C, α rm =4.6×10 -6 / °C, μ=0.1, ζ=25μm, T 0 = 1000°C.

[0236] Substituting the above parameters into the steady-state matrix cracking stress distribution equation, the fiber / matrix interface debonding zone length equation and the steady-state matrix cracking equilibrium relationship equation, the steady-state matrix cracking stress of the test sample is obtained by solving, which is the predicted value. Forecast results such as image 3 The specific test results are shown in Table 2.

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Abstract

The invention belongs to the technical field of ceramic matrix composite steady-state matrix cracking stress prediction, and particularly relates to a method for predicting the cracking stress of a steady-state matrix of a woven ceramic-based composite material by considering the environmental influence. The invention provides a steady-state matrix cracking stress distribution equation, which is constructed and obtained by utilizing the length of a fiber / matrix interface oxidation area, and the fiber / matrix interface oxidation zone friction shear stress under the temperature condition and thefiber / matrix interface debonding zone friction shear stress under the temperature condition are constructed, so that the temperature and oxidation factors are included into a steady-state matrix cracking stress equation, and a basis is provided for accurately predicting the cracking stress of the steady-state matrix of the woven ceramic matrix composite material. Results of the embodiment show that the prediction method provided by the invention can predict the cracking stress of the woven ceramic-based composite material at different use temperatures.

Description

technical field [0001] The invention belongs to the technical field of predicting the cracking stress of a steady-state matrix of a ceramic matrix composite material, and in particular relates to a method for predicting the cracking stress of a steady-state matrix of a braided ceramic matrix composite material in consideration of environmental influences. Background technique [0002] Braided ceramic matrix composites have the advantages of high temperature resistance, corrosion resistance, low density, high specific strength, and high specific modulus. Compared with superalloys, they can withstand higher temperatures, reduce cooling airflow, and improve turbine efficiency. Therefore, they have become Preparation materials for various devices such as aero-engine combustors, turbine guide vanes, turbine shell rings, and tail nozzles. The high-pressure turbine of the LEAP (Leading Edge Aviation Propulsion, LEAP) series engine developed by CFM uses braided ceramic matrix compos...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06Q10/04
CPCG06F30/20G06F2119/06G06Q10/04
Inventor 李龙彪
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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