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Ceramic matrix composite thermo-mechanical damage characterization method based on micro-porosity increment

A composite material and microporous technology, which is applied in the field of damage tolerance evaluation and design of ceramic matrix composite materials, can solve the problems of inaccurately characterizing the thermomechanical damage of CMCs, and achieve the effect of accurate evolution behavior

Active Publication Date: 2020-02-07
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The above-mentioned existing methods do not consider the influence of the change of porosity on the material stiffness during the loading process of the material. However, the main form of damage of CMCs under thermo-mechanical loading is matrix microcracks. Therefore, the above-mentioned methods cannot accurately characterize Thermomechanical damage of CMCs

Method used

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  • Ceramic matrix composite thermo-mechanical damage characterization method based on micro-porosity increment
  • Ceramic matrix composite thermo-mechanical damage characterization method based on micro-porosity increment
  • Ceramic matrix composite thermo-mechanical damage characterization method based on micro-porosity increment

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Embodiment 1

[0068] S11: Heat the muffle furnace to 1100°C, then quickly place the CMCs specimen in the furnace and keep it warm for 10-20 minutes. In this embodiment of the present invention, 10 minutes is taken as an example to make the temperature of the specimen uniform and fully establish thermal balance with the furnace;

[0069] Then quickly take the test piece out of the furnace, put it in a constant temperature water bath of distilled water at 25°C, and keep stirring the distilled water to avoid the accumulation of the vapor layer, so that the test piece can fully exchange heat with the distilled water;

[0070] Cool the test pieces in a water bath to room temperature, take them out and dry them in the air, and number each test piece;

[0071] The open porosity and pore size distribution of each specimen before and after cyclic thermal shock were determined by mercury intrusion porosimetry using a mercury porosimeter, and the presence of CMCs in the specimen was observed by X-ray ...

Embodiment 2

[0073] S11: Heat the muffle furnace to 800°C, then quickly place the CMCs specimen in the furnace and keep it warm for 10-20 minutes. In this embodiment of the present invention, 20 minutes is taken as an example to make the temperature of the specimen uniform and fully establish thermal balance with the furnace;

[0074] Then quickly take the test piece out of the furnace, put it in a constant temperature water bath of distilled water at 25°C, and keep stirring the distilled water to avoid the accumulation of the vapor layer, so that the test piece can fully exchange heat with the distilled water;

[0075] Cool the test pieces in a water bath to room temperature, take them out and dry them in the air, and number each test piece;

[0076] The open porosity and pore size distribution of each specimen before and after cyclic thermal shock were determined by mercury intrusion porosimetry using a mercury porosimeter, and the presence of CMCs in the specimen was observed by X-ray c...

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Abstract

The invention relates to the field of ceramic matrix composite structure damage tolerance evaluation and design, and discloses a ceramic matrix composite thermo-mechanical damage characterization method based on micro-porosity increment. The ceramic matrix composite thermo-mechanical damage characterization method comprises the following steps: S1, determining quantitative correlation between material porosity and applied thermo-mechanical load; S2, considering the influence of porosity, and establishing a model for calculating the macroscopic effective elastic modulus of the CMCs; S3, distributing the influence of the porosity of the material on the macroscopic effective elastic modulus of the material to the fiber phase and the matrix phase in a weight function form; and S4, establishingthe correlation between the energy release rate of the material and the micro-porosity increment of the material. According to the ceramic matrix composite thermo-mechanical damage characterization method, the thermal mechanical damage evolution behavior can be described more accurately.

Description

technical field [0001] The invention relates to the field of structural damage tolerance evaluation and design of ceramic matrix composite materials, in particular to a thermomechanical damage characterization method of ceramic matrix composite materials based on microporosity increment. Background technique [0002] Ceramic matrix composites (Ceramic-Matrix Composites, CMCs) is a lightweight structural material that has attracted much attention due to its ability to maintain good performance under conditions such as high temperature, oxidation, fatigue, and creep. Therefore, the thermal protection of high-speed aircraft CMCs are utilized in critical hot-end components such as flame tubes of turbine engines, turbine guide vanes, turbine outer rings, heat shields, and flame holders, and these applications are important to aerospace engineering. [0003] Barriers to the industrial application of CMCs are extremely limited empirical knowledge of their microstructural evolution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F119/14G06F119/08G06F119/04
Inventor 杨正茂闫涵裴长浩龙丽平刘晖
Owner INST OF MECHANICS - CHINESE ACAD OF SCI