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Characterization method and system for structural density uniformity of ceramic matrix composite material

A technology of density uniformity and composite materials, which is used in the analysis of materials, material analysis using wave/particle radiation, image enhancement, etc. It can solve the problems of density uniformity and lack of CMC data layers that cannot be clearly and clearly represented.

Pending Publication Date: 2022-06-28
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, using the penetration of X-rays and applying industrial CT non-destructive testing technology to scan ceramic matrix composite material samples, the distribution of defects in the sample structure can be obtained, but it cannot clearly indicate that the density of the data layer in the CMC structure is uniform lack of the use of actual digital parameters to characterize the impact of defects in the CMC structure on the overall density

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  • Characterization method and system for structural density uniformity of ceramic matrix composite material
  • Characterization method and system for structural density uniformity of ceramic matrix composite material
  • Characterization method and system for structural density uniformity of ceramic matrix composite material

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Embodiment 1

[0031] The existing method for the density uniformity of ceramic matrix composites is to use the fitted linear relationship between the CT value of the image and the attenuation coefficient to make a rough estimation. There is a lack of a specific parameter to accurately measure the density uniformity of the CMC structure. characterization. For this, see figure 1 , this embodiment provides a method for characterizing the structural density uniformity of a ceramic matrix composite material, including:

[0032] S1: collect a two-dimensional slice image of the ceramic matrix composite structure;

[0033] In this embodiment, an industrial CT detection device is used to collect two-dimensional slice images of the ceramic matrix composite structure, such as figure 2 As shown, the industrial CT detection device includes a radiation source, a mechanical scanning system, a detector, a computer, a database and an image display system;

[0034] The ray source preferably adopts the X-...

Embodiment 2

[0094] see Figure 4 , this embodiment also provides a characterization system for the uniformity of the structure density of the ceramic matrix composite material, including:

[0095] The acquisition module M1 is used to acquire the two-dimensional slice image of the ceramic matrix composite material structure;

[0096] The preprocessing module M2 is used for preprocessing the two-dimensional slice image by adopting the adaptive wavelet threshold algorithm and the multi-scale top hat transformation algorithm to obtain the preprocessed image;

[0097] a positioning module M3, configured to locate the defect area of ​​the ceramic matrix composite material structure according to the grayscale value of the preprocessed image;

[0098] a calculation module M4 for calculating the fractal dimension of each of the defect regions;

[0099] The characterization module M5 is used to characterize the density uniformity of the ceramic matrix composite structure according to all the frac...

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Abstract

The invention relates to a characterization method and system for structural density uniformity of a ceramic-based composite material, and belongs to the field of composite material defect detection.The characterization method comprises the steps that defect scanning is conducted on the ceramic-based composite material through an industrial CT nondestructive testing technology, and a two-dimensional slice image of the ceramic-based composite material is obtained; a two-dimensional image is subjected to filtering and image enhancement operation through a self-adaptive wavelet threshold algorithm and a feature extraction algorithm based on a multi-scale top cap, and finally the fractal dimension of an image defect area is calculated by using a fractal theory, so that the density uniformity of the ceramic matrix composite structure can be accurately represented by using specific digits.

Description

technical field [0001] The invention relates to the field of composite material defect detection, in particular to a method and system for characterizing the structural density uniformity of a ceramic matrix composite material. Background technique [0002] With the continuous improvement of engine performance during the service of aerospace vehicles, the demand for advanced high-temperature structural materials is becoming more and more urgent. In recent years, major engine manufacturers have increased their investment, aiming at a new generation of high temperature resistant materials - ceramic matrix composites (CMC). Ceramic matrix composite material is a kind of composite material composed of various fibers woven with ceramic materials such as silicon carbide or silicon nitride as the matrix. Its temperature resistance is greatly improved (near 2000 ℃), far exceeding that of ordinary metal materials, and its strength and stiffness are high at high temperatures. In add...

Claims

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Application Information

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IPC IPC(8): G01N23/046G06T7/00G06T7/73G06T5/00G06T5/30G06V10/56
CPCG01N23/046G06T7/0004G06T7/73G06T5/30G01N2223/1016G01N2223/601G01N2223/615G06T2207/10081G06T2207/20064G06T2207/30108G06T5/90G06T5/70
Inventor 张玉燕于紫梦温银堂李启航梁波
Owner YANSHAN UNIV