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Method for computing equivalent elastic parameters of fiber reinforced composite material

A technology of composite materials and elastic parameters, applied in calculation, image data processing, instruments, etc., can solve problems such as deviation

Active Publication Date: 2014-06-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is difficult to consider these influencing factors based on the periodic unit cell model, so the numerical method mentioned above has a large deviation from the experimental value in the prediction of elastic parameters

Method used

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  • Method for computing equivalent elastic parameters of fiber reinforced composite material
  • Method for computing equivalent elastic parameters of fiber reinforced composite material
  • Method for computing equivalent elastic parameters of fiber reinforced composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Please refer to Figure 2 to Figure 4 As shown, the calculation of equivalent elastic parameters of plain weave carbon fiber reinforced ceramic matrix composites:

[0078] Such as figure 2 Shown is a typical plain weave carbon fiber reinforced ceramic matrix composite material specimen, the reinforcement phase is carbon fiber, and the matrix is ​​silicon carbide matrix. The elastic parameters of carbon fiber are as follows:

[0079] E. 11 =221Gpa,E 22 =E 33 =13.8Gpa,G 12 =G 13 =9.0Gpa,G 23 =9.2Gpa,μ 12 =μ 13 =0.2,μ 23 =0.25

[0080] The elastic parameters of the matrix are as follows:

[0081] E=450Gpa, μ=0.25

[0082] Step 1: Scan the specimen sample with XCT to obtain image 3 The layer-by-layer grayscale image sequence shown;

[0083] Step 2: The tomographic image sequence has a total of 16 images. The pixel size of each image is 154 pixels wide and 83 pixels high. The gray scale range of each pixel is 0-255. Read the tomographic image sequence of the...

Embodiment 2

[0092] Please refer to Figure 5 to Figure 7 As shown, the calculation of equivalent elastic parameters of plain punctured carbon fiber reinforced ceramic matrix composites:

[0093] Such as Figure 5 Shown is a typical plain-grain punctured carbon fiber reinforced ceramic matrix composite specimen. The reinforcing phase is carbon fiber, and the matrix is ​​silicon carbide matrix. The elastic parameters of carbon fiber are as follows:

[0094] E. 11 =221Gpa,E 22 =E 33 =13.8Gpa,G 12 =G 13 =9.0Gpa,G 23 =9.2Gpa,μ 12 =μ 13 =0.2,μ 23 =0.25

[0095] The elastic parameters of the matrix are as follows:

[0096] E=450Gpa, μ=0.25

[0097] Step 1: Scan the specimen sample with XCT to obtain Figure 6 The layer-by-layer grayscale image sequence shown;

[0098] Step 2: The tomographic image sequence has a total of 5 images. The pixel size of each image is 124 pixels wide and 159 pixels high. The gray scale range of each pixel is 0-255. Read the tomographic image sequence o...

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Abstract

The invention provides a method for computing equivalent elastic parameters of a fiber reinforced composite material, and belongs to the technical field of calculation of statics performance parameters of composite materials. A composite material micro-structure model is established by using an XCT (X-ray computed tomography) technology and more approaches a true situation; important parameters affecting elasticity modulus, such as fiber bundle shape, fiber volume ratio, porosity and pore distribution, can be automatically obtained without a hypothesis. The method is more reasonable, higher in computation accuracy, and more universal in flow; various paradoxical hypotheses and complicated mathematical derivations are eliminated, and an engineer accepts and masters the method more easily.

Description

Technical field: [0001] The invention relates to a method for calculating equivalent elastic parameters of fiber-reinforced composite materials, which belongs to the technical field of calculation of static performance parameters of composite materials. Background technique: [0002] Fiber-reinforced composite materials have the characteristics of high specific stiffness and specific strength, and can also be used as structural materials in extremely high temperature environments. They are important materials in the fields of aerospace, military, new energy, and automobiles. Fiber-reinforced composite materials are divided into unidirectional, two-dimensional braided, 2.5-dimensional, three-dimensional orthogonal, three-dimensional and four-directional composite materials. Regardless of the configuration of the composite material, when a low-velocity static load is applied, the stress-strain curve generally contains a linear segment and a nonlinear segment. The slope of the...

Claims

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Application Information

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IPC IPC(8): G06T7/00
Inventor 高希光宋迎东罗漂洋
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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