Method for predicting inner oxidation morphology of unidirectional ceramic matrix composite material in stress water vapor environment

A composite material, internal oxidation technology, applied in design optimization/simulation, special data processing application, chemical process analysis/design, etc., can solve problems such as the inability to predict the internal oxidation morphology of unidirectional ceramic matrix composites

Active Publication Date: 2019-09-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention aims at the deficiencies of the above-mentioned prior art, and provides a method for predicting the internal oxidation morphology of unidirectional ceramic matrix composites in a stress water vap

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for predicting inner oxidation morphology of unidirectional ceramic matrix composite material in stress water vapor environment
  • Method for predicting inner oxidation morphology of unidirectional ceramic matrix composite material in stress water vapor environment
  • Method for predicting inner oxidation morphology of unidirectional ceramic matrix composite material in stress water vapor environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0153] In this embodiment 1, the unidirectional ceramic matrix composite material is subjected to a method for predicting the internal oxidation morphology of the material under a stress water vapor oxidation environment at 900-1200°C, which specifically includes the following steps:

[0154] Step (1), determining the number of cracks in the unidirectional ceramic matrix composite 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 of the number of cracks in the matrix with stress;

[0155] Step (1) specifically includes the following steps:

[0156] The strength of the unidirectional ceramic matrix composite matrix has a certain dispersion, and the cracking of the matrix under stress is a random process. 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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for predicting inner oxidation morphology of a unidirectional ceramic matrix composite material in a stress water vapor environment. The method comprises the following steps of determining a matrix crack number of the unidirectional ceramic matrix composite material; determining a crack width change rule; calculating a diffusion coefficient of water vapor in CO and H2 mixed gas; measuring a specific ratio of CO and H2 which are generated in actual oxidation reaction; and determining the inner oxidation morphology of the ceramic matrix composite material, namely calculating a water vapor concentration field, and determining the inner oxidation morphology of the ceramic matrix composite material at anytime. The method predicates the inner oxidation morphology of the ceramic matrix composite material in the stress water vapor environment and accurately acquires the inner crack wall oxidation of the material after stress oxidation, and oxidation morphology of fibers, an interface and a matrix after the water vapor enters the crack bottom, thereby supplying a theoretical support and an experiment basis for an oxidation problem of the unidirectional ceramic matrix composite material in the stress water oxygen coupling environment.

Description

technical field [0001] The invention relates to a method for predicting the oxidation morphology of a ceramic matrix composite material in a stress water vapor environment, in particular to a method for predicting the internal oxidation morphology of a unidirectional silicon carbide fiber toughened silicon carbide ceramic matrix composite material in a stress water vapor environment. Background technique [0002] Silicon carbide fiber reinforced silicon carbide ceramic matrix composites (Continuous silicon carbide fiber reinforced silicon carbide composites, referred to as SiC / SiC) has excellent properties such as high temperature resistance, low density, high specific strength, high specific modulus, etc. It has a wide application prospect on components such as nozzle adjustment pieces. [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 curre...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G16C20/10G06F17/50
CPCG16C20/10G06F2119/06G06F30/20
Inventor 孙志刚陈西辉丁俊杰宋迎东牛序铭李宏宇
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap