A Prediction Method of Residual Stiffness of Ceramic Matrix Composites in Stress Oxidation Environment

A composite material, oxidizing environment technology, applied in design optimization/simulation, instrumentation, electrical digital data processing, etc., can solve problems such as the inability to accurately predict the residual stiffness change of unidirectional SiC/SiC materials

Active Publication Date: 2020-03-06
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0008] The present invention aims at the deficiencies of the above prior art, and provides a method for predicting the residual stiffness of ceramic matrix composite materials in a stress oxidation environment, so as to solve the problem in the prior art that the unidirectional SiC / SiC material cannot be accurately predicted in a stress oxidation environment. The problem of residual stiffness variation under

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  • A Prediction Method of Residual Stiffness of Ceramic Matrix Composites in Stress Oxidation Environment
  • A Prediction Method of Residual Stiffness of Ceramic Matrix Composites in Stress Oxidation Environment
  • A Prediction Method of Residual Stiffness of Ceramic Matrix Composites in Stress Oxidation Environment

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Embodiment

[0125] In this embodiment, the unidirectional SiC / SiC material is subjected to a residual strength prediction method under a stress oxidation environment at 900-1200°C, which specifically includes the following steps:

[0126] Step (1), determining the number of cracks in the unidirectional SiC / SiC material matrix: considering the thermal residual stress, and according to the stress borne by the matrix under the action of tensile stress, determine the change in the number of cracks in the matrix with stress;

[0127] Step (1) specifically includes the following steps:

[0128] The strength of the unidirectional SiC / SiC material matrix has a certain dispersion, and the cracking of the matrix under stress is a random process. According to the Monte Carlo method, assuming that the failure probability of the matrix obeys the Poisson distribution, the probability that the matrix will fail due to at least one crack under stress is:

[0129] P(ξ=σ,η=L s )=1-exp{-M(A)}, N(A)≥1 (1) ...

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Abstract

The present invention disclosed a method of ceramic -based composite materials in the stress oxidation environment, including the following steps: determine the number of cracks for one -way SIC / SIC composite material base;The thickness of the oxide on the fiber; determining the amount of fibrous extension after the stress oxidation; the stress distribution of the fiber in the process of stress oxidation; determining the fiber characteristic strength distribution; determining the fiber fracture score; determining the fiber stress distribution after re -loading;SIC composite material remaining stiffness; the present invention can accurately give the unidirectional SIC / SIC composite material after a certain period of stress oxidation, which can predict the remaining stiffness performance of the unidirectional SIC / SIC composite composite stress oxidation environment.The safe use of unidirectional SIC / SIC composite materials provides theoretical support.

Description

technical field [0001] The invention belongs to the technical field of material stiffness prediction, and in particular relates to a method for predicting the residual stiffness of a ceramic matrix composite material in a stress oxidation environment. Background technique [0002] Silicon carbide fiber reinforced silicon carbide ceramic matrix composites (Continuous silicon carbide fiber reinforced silicon carbide composites, hereinafter referred to as SiC / SiC) have excellent properties such as high temperature resistance, low density, high specific strength, and high specific modulus. Important candidate materials for end parts. [0003] Due to the good compatibility of pyrolytic carbon with silicon carbide fiber and matrix, it is widely used as an interface phase in SiC / SiC materials. SiC / C / SiC materials are currently mainly used in high temperature (>900°C) stress oxidation environments. In this environment, due to the existence of stress, the matrix will crack, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F119/14
CPCG06F2119/06G06F30/20
Inventor 孙志刚熊严陈西辉李宏宇宋迎东牛序铭
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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