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Thermomechanical damage characterization method of ceramic matrix composites based on porosity increment

A composite material and porosity technology, which is applied in the field of damage tolerance assessment and design of ceramic matrix composite materials, and can solve the problems of inability to accurately characterize the thermal and mechanical damage of CMCs.

Active Publication Date: 2021-06-08
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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  • Thermomechanical damage characterization method of ceramic matrix composites based on porosity increment
  • Thermomechanical damage characterization method of ceramic matrix composites based on porosity increment
  • Thermomechanical damage characterization method of ceramic matrix composites based on porosity increment

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Embodiment 1

[0068] S11: Heat the muffle to 1100 ° C and then rapidly placed in the furnace and held for 10-20 minutes, in this embodiment of the present invention, to illustrate the temperature of the test piece to make the temperature of the test piece uniform Chemical, and build a thermal balance with the furnace;

[0069] The test piece was then rapidly removed from the furnace, and in the constant temperature water bath of a distilled water at 25 ° C, distilled water is continuously stirred to avoid the accumulation of the vapor layer, so that the test piece can sufficient heat exchange with distilled water;

[0070] The test piece is cooled in the water bath to room temperature, removed and dried in the air, and numbered each test piece;

[0071] Using a mercury apparatus, the opening porosity and aperture distribution before and after the circulating thermal shock is measured by a pressurizing porosity method, and the CMCS sample is observed by X-ray computer tomography analysis and sca...

Embodiment 2

[0073] S11: Heat the muffle to 800 ° C and then rapidly placed in the furnace and held for 10-20 minutes, in this embodiment of the present invention, in this embodiment, in this embodiment, to explain the temperature of the test piece is uniform Chemical, and build a thermal balance with the furnace;

[0074] The test piece was then rapidly removed from the furnace, and in the constant temperature water bath of a distilled water at 25 ° C, distilled water is continuously stirred to avoid the accumulation of the vapor layer, so that the test piece can sufficient heat exchange with distilled water;

[0075] The test piece is cooled in the water bath to room temperature, removed and dried in the air, and numbered each test piece;

[0076] Using a mercury apparatus, the opening porosity and aperture distribution before and after the circulating thermal shock is measured by a pressurizing porosity method, and the CMCS sample is observed by X-ray computer tomography analysis and scanni...

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Abstract

The invention relates to the field of structural damage tolerance evaluation and design of ceramic matrix composite materials, and discloses a ceramic matrix composite material thermomechanical damage characterization method based on microporosity increment, including steps: S1: determining the porosity of the material and the applied thermomechanical damage Quantitative correlation between loads; S2: Considering the influence of porosity, a model for calculating the macroscopic effective elastic modulus of CMCs is established; S3: The influence of material porosity on the macroscopic effective elastic modulus of materials is assigned to the fiber phase in the form of a weight function and matrix phase; S4: Establish the correlation between the energy release rate of the material and the increment of the microporosity of the material. It can more accurately describe the evolution behavior of thermomechanical damage.

Description

Technical field [0001] The present invention relates to a structural injury tolerance assessment and design of ceramic matrix composite material, and more particularly to a method for thermal mechanical damage of a ceramic matrix composite material based on porosity increments. Background technique [0002] Ceramic-Matrix Composites, CMCS is a light structure material that maintains good performance in high temperature, oxidation, fatigue, creep, etc., so the heat protection of high-speed aircraft The key thermal components such as the flameless cylinder, turbine engine, turbine guide blades, turbine outer rings, heat insulating screens, and flame stabilizers can utilize CMCs, which are very important to aerospace projects. [0003] Industrial Applications CMCS barriers are extremely limited in microstructure evolution and mechanical performance degradation, and lack of solid mechanical models for predictive residual mechanical properties and fatigue life, more importantly, exces...

Claims

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Application Information

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Patent Type & Authority Patents(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