Method for predicting residual stiffness of two-dimensional braided ceramic matrix composite material after oxidation

A technology of composite materials and prediction methods, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve problems such as consuming large experimental funds

Active Publication Date: 2016-09-07
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, the experimental method consumes a lot of experimental funds, and the proposed calculation model can only calculate the residual stiffness at discrete specific temperatures

Method used

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  • Method for predicting residual stiffness of two-dimensional braided ceramic matrix composite material after oxidation
  • Method for predicting residual stiffness of two-dimensional braided ceramic matrix composite material after oxidation
  • Method for predicting residual stiffness of two-dimensional braided ceramic matrix composite material after oxidation

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Embodiment Construction

[0057] The present invention will be further explained below in conjunction with the accompanying drawings.

[0058] In this example, the two-dimensional plain weave C / SiC composite material is taken as an example to predict the residual stiffness of the material after oxidation in the range of 700°C to 900°C. The material performance parameters are shown in Table 1.

[0059] Table 1

[0060]

[0061] Such as Figure 8 As shown, the specific steps of this method are as follows:

[0062] (1), based on the theory of mass loss rate and the assumption of fiber degradation law, an oxidation kinetic model is established. Among them, the mass loss rate theory is divided into two temperature ranges:

[0063] 1) When the temperature is in the range of 400 °C to 700 °C, the formula for the mass loss rate of the composite material is as follows:

[0064] λ r = Δ W W ...

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Abstract

The invention relates to a method for predicting residual stiffness of a two-dimensional braided ceramic matrix composite material after oxidation. The stiffness refers to elastic deformation resistance ability of the material under stress. By analyzing the stiffness of each component of the material, stress and strain distribution in the material can be determined. Therefore, the invention provides the method capable of accurately predicting the residual stiffness of the two-dimensional braided ceramic matrix composite material after oxidation. A kinetic model considering fiber oxidation is proposed, and based on this, a microscale model considering fiber oxidation and a mesoscale model of the two-dimensional braided ceramic matrix composite material are established. With the adoption of a finite element method, the residual stiffness of the material after oxidation is calculated by applying a periodic boundary condition. According to the method, the residual stiffness of the material in different oxidation temperature intervals at different oxidation time can be accurately predicted and does not need to be tested by a large amount of manpower and material resources through tests, so that a large amount of test costs are reduced.

Description

technical field [0001] The invention relates to a method for predicting the residual stiffness of a two-dimensional braided ceramic matrix composite material after oxidation. Background technique [0002] Two-dimensional braided ceramic matrix composites have excellent properties such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance and low density, and have a wide demand in high temperature protection systems for aerospace vehicles. During the use of materials, due to the influence of high-temperature environmental factors, oxidative damage will gradually occur, resulting in a decrease in the mechanical properties of the material, which will seriously affect the service life and safety of engineering components. Stiffness refers to the ability of a material to resist elastic deformation when it is stressed. It is of great significance to study the residual stiffness of two-dimensional plain weave ceramic matrix composites a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23G06F30/367
Inventor 孙志刚陈西辉宋迎东
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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