Ceramic matrix composite mesoscopic modeling and mechanical calculation method based on structural grid

A technology of composite materials and calculation methods, which is applied in calculation, computer-aided design, design optimization/simulation, etc., can solve problems such as the inability to achieve high-throughput mesoscopic modeling of materials, reduce the time for modeling and calculation, and reduce the Difficulty, the effect of reducing people's dependence

Active Publication Date: 2019-10-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

That is, it can only perform mesoscopic modeling and mechanical calculations on pre-prepared materials, but cannot achieve high-throughput mesoscopic modeling of materials by giving arbitrary parameters
At present, there is no effective method for mesoscopic modeling and mechanical calculation of ceramic matrix composites based on structural grids.

Method used

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  • Ceramic matrix composite mesoscopic modeling and mechanical calculation method based on structural grid
  • Ceramic matrix composite mesoscopic modeling and mechanical calculation method based on structural grid
  • Ceramic matrix composite mesoscopic modeling and mechanical calculation method based on structural grid

Examples

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Embodiment example

[0064] Implementation case: Mesoscopic modeling and stiffness calculation of plain weave SiC / SiC ceramic matrix composites based on structural mesh.

[0065] Step 1: Calculate the geometric parameters required for modeling

[0066] (1) Given independent geometric parameters, including warp direction wavelength LC=10mm, warp direction amplitude AC=0.24mm and warp cross-sectional width WC=1.74mm.

[0067] (2) Calculate all geometric parameters required for modeling

[0068] Assume that the yarn cross-section consists of two sinusoids of the same shape whose shape is determined by the sinusoidal wavelength λ c = LC = 10mm and amplitude A c = AC = 0.24mm, and the short axis distance L c = AC = 1.74mm decision. In addition, the required geometric parameters are the unit cell length L 1 =LC=10mm, unit cell width L 2 =2·WC=3.48mm, unit cell height H=2·AC=0.48mm.

[0069] Step 2: Divide the structural grid

[0070] Such as figure 1 As shown, in the three dimensions of length,...

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Abstract

The invention belongs to the technical field of composite material modeling and mechanical calculation, and particularly relates to a ceramic matrix composite material microscopic modeling and mechanical calculation method based on a structural grid. According to the method, based on the structure grid, the material types to which the pixel units belong are distinguished through several given independent mesoscopic geometrical parameters, and therefore mesoscopic modeling of the ceramic matrix composite is achieved. A homogenization theory is adopted, a flexibility matrix is obtained accordingto six groups of stress-strain relations under different periodic boundary conditions, and finally elastic parameter calculation is achieved. According to the method, parameterized modeling of the ceramic matrix composite mesoscopic geometric model and automatic hexahedral mesh division are realized in a parameterized manner, and mechanical calculation is realized. Compared with a traditional method, the method has the advantages that the difficulty is greatly reduced, the dependence on people is reduced, and the modeling and calculation time is shortened.

Description

technical field [0001] The invention belongs to the technical field of composite material modeling and mechanical calculation, and in particular relates to a method for mesoscopic modeling and mechanical calculation of ceramic matrix composite materials based on structural grids. Background technique [0002] As an advanced new material, ceramic matrix composites have become ideal candidates in special engineering industries such as aerospace. In order to realize the structural design and engineering application of ceramic matrix composites, it is necessary to conduct microscopic modeling and mechanical calculations. At present, common mesoscopic modeling methods can be divided into unstructured grid method and structured grid method. [0003] Based on unstructured grids, Kong Chunyuan et al. (Kong Chunyuan, Sun Zhigang, Gao Xiguang, Song Yingdong: 2.5-dimensional C / SiC composite unit cell model and stiffness prediction, 26, 2459-2467, (2011)) realized 2.5-dimensional braid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 高希光董洪年宋迎东张盛于国强陈正扬
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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