Detection method of damage of one-way silicon carbide fiber toughening silicon carbide ceramic matrix composite in oxidation environment
A technology of silicon carbide fiber and composite materials, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of low precision and poor precision of mesomechanical models, improve accuracy, solve problems of low precision, Overcome the effect of high cost
Active Publication Date: 2015-06-17
NORTHWESTERN POLYTECHNICAL UNIV
View PDF1 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0007] In order to overcome the deficiency of the existing unidirectional SiC / SiC composite material damage detection method with poor precision, the present invention provides a damage detection method of unidirectional silicon carbide fiber toughened silicon carbide ceramic matrix composite material in an oxidizing environment
It can improve the accuracy of damage analysis of unidirectional SiC / SiC composite material damage detection method, and solve the technical problem of low precision of mesoscopic mechanical model
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0026] The specific steps of the detection method for the damage of the unidirectional silicon carbide fiber toughened silicon carbide ceramic matrix composite material in the oxidizing environment of the present invention are as follows:
[0027] In the following, for a unidirectional SiC / SiC composite material subjected to an axial tensile stress of 800MPa in an air environment of 600°C and 100KPa, the material damage at different oxidation times is calculated. The radius R of the silicon carbide fiber bundle in the unidirectional SiC / SiC composite is 2 mm, and the thickness d of the carbon interface and the silicon carbide matrix is i 、d m 200μm and 800μm respectively, the width H of the matrix microcrack C The distance between adjacent microcracks, that is, the z-direction length L of the periodic microstructure is 16 mm. The performance parameters of each component material are shown in Table 1.
[0028] Table 1 Performance parameters of component materials
[0029] ...
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
| Property | Measurement | Unit |
|---|---|---|
| radius | aaaaa | aaaaa |
| thickness | aaaaa | aaaaa |
Login to View More
Abstract
The invention discloses a detection method of damage of one-way silicon carbide fiber toughening silicon carbide ceramic matrix composite in oxidation environment and aims to solve the technical problem that the prior detection method of damage of the one-way silicon carbide (SiC) / SiC composite is bad in accuracy. The technical scheme is that an oxidizing reaction kinetics equation is applied to calculate the thickness of oxidation loss of a carbon interface in the composite material microstructure oxidation process and acquire a geometric model under different oxidation times of the composite microstructure; a finite element model of the composite microstructure after being oxidized is built to conduct finite element calculation of microcosmic stress; and maximum stress strength criterions are adopted to detect damage conditions of materials. The detection method of damage of the one-way silicon carbide fiber toughening silicon carbide ceramic matrix composite in the oxidation environment is simple and high-efficiency from the molding process to the calculation process, overcomes the defects that the prior experimental method is high in cost and long in time consumption, acquires the microcosmic stress in the microstructure of the composite after being oxidized with the help of the strong finite element analysis function of ANSYS; improves accuracy of damage analysis of the one-way SiC / SiC composite and solves the problem that the mesomechanics model is low in accuracy.
Description
technical field [0001] The invention relates to a damage detection method of a silicon carbide fiber toughened silicon carbide ceramic matrix composite material, in particular to a damage detection method of a unidirectional silicon carbide fiber toughened silicon carbide ceramic matrix composite material in an oxidizing environment. Background technique [0002] Silicon carbide fiber toughened 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, making it a One of the irreplaceable new high-temperature structural materials, widely used in aviation and aerospace engine hot-end parts, aerospace round-trip heat protection system, high-speed brakes, gas turbine hot-end parts, high-temperature gas filtration and heat exchangers, etc., its working environment ...
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
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 许英杰张卫红张清文王骏
Owner NORTHWESTERN POLYTECHNICAL UNIV