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Method for identifying elastic parameters of fibers and matrix of composite after molding

A composite material, elastic parameter technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as changes in fiber and matrix properties, difficulty in determining the properties of composite finished products, and achieve important engineering significance.

Inactive Publication Date: 2018-09-28
SOUTHEAST UNIV
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Problems solved by technology

In the process of material production, processes such as heat treatment and pressure forming are required. These processes will cause changes in the properties of fibers and matrix, making it difficult to determine the properties of finished composite materials.

Method used

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  • Method for identifying elastic parameters of fibers and matrix of composite after molding
  • Method for identifying elastic parameters of fibers and matrix of composite after molding
  • Method for identifying elastic parameters of fibers and matrix of composite after molding

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Embodiment Construction

[0044] The technical solution of the present invention will be further introduced below in combination with specific implementation methods and accompanying drawings.

[0045] This specific embodiment discloses a method for identifying elastic parameters of fibers and matrix after composite material molding, such as figure 1 As shown, the unit cell model of fiber-reinforced composite material is taken as an example to illustrate, where the fiber is a transversely isotropic material, and the main direction is the x direction, where E 11 =220GPa,E 22 =13.8GPa,μ 12 =0.2, G 12 =9GPa,μ 23 =0.25; the matrix is ​​an isotropic material, E=250GPa, μ=0.25. The method includes the following steps:

[0046] S1: Establish the mesoscopic model of the composite material, the schematic diagram of the unit cell model is as follows figure 2 , 3 As shown, the static structural analysis of the mesoscopic model was performed by the finite element method, the static displacement data was ex...

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Abstract

The invention discloses a method for identifying elastic parameters of fibers and a matrix of a composite after molding, comprising the following steps: S1, building a microscopic model of the composite, carrying out static structural analysis on the microscopic model by adopting a finite element method, extracting static displacement data, and calculating relative sensitivity of a static displacement field on the elastic parameters of the fibers and the matrix; and S2, taking 2-norm of displacement residual errors of a test and finite element simulation as a target function, and minimizing the target function by utilizing an iterative optimization algorithm. The method disclosed by the invention provides a composite microscopic model considering properties of component materials, carriesout relative sensitivity analysis on parameters of the component materials by virtue of structural displacement responses, identifies the elastic parameters of the fibers and the matrix of the composite after molding by adopting the iterative optimization algorithm and has great significance in engineering.

Description

technical field [0001] The invention relates to the technical field of calculating static performance parameters of composite materials, in particular to a method for identifying elastic parameters of fibers and matrix after composite materials are molded. Background technique [0002] Composite materials have the advantages of high specific strength, high specific modulus, and strong designability, and are widely used in aerospace, civil engineering, mechanical engineering and other fields. In different engineering fields, there are different requirements for the macroscopic mechanical properties of composite materials. Therefore, accurate component performance parameters of composite materials are required to provide basic information for material structure design. The material performance of the composite material after molding is quite different from that of the corresponding single-component material, which can be attributed to the gap between the laboratory standard ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 姜东秦福溶费庆国朱锐曹芝腑
Owner SOUTHEAST UNIV
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