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Method for simulating biaxial test of braided composite material and determining material performance parameters by using finite element method

A composite material and material performance technology, which is applied in the field of biaxial test parameter determination of braided composite materials, can solve problems such as large differences in data, and achieve the effects of simple operation, strong repeatability, and comprehensive mechanical response.

Active Publication Date: 2014-08-06
HARBIN INST OF TECH
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Problems solved by technology

However, there are various forms of material biaxial tests, including not only tension-pull, tension-compression, tension-shear, compression-shear, etc., but also different load ratios can be set for each type, and the data obtained by each different form are very different. How to scientifically and accurately characterize the properties of materials through biaxial tests has become a new challenge

Method used

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  • Method for simulating biaxial test of braided composite material and determining material performance parameters by using finite element method
  • Method for simulating biaxial test of braided composite material and determining material performance parameters by using finite element method
  • Method for simulating biaxial test of braided composite material and determining material performance parameters by using finite element method

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specific Embodiment approach 1

[0025] Specific Embodiment 1: This embodiment provides a method for simulating the biaxial test of braided composite materials to determine material performance parameters using the finite element method. This method needs to complete different forms of biaxial tests, and requires a polarizing microscope and a nanoindenter. The finite element software Abaqus and certain programming ability are required, which includes the following steps:

[0026] 1. Use a polarizing microscope to observe the braided composite material, use its periodicity to determine its smallest representative volume unit, and accurately measure the size and spatial distribution of the fiber bundles and matrix in several representative volume units , taking its average value;

[0027] 2. After the braided composite material is roughly ground to the shape required by the nano-indenter, use nano-indentation technology to determine the transverse modulus E of the fiber bundle at different positions of the samp...

specific Embodiment approach 2

[0047] Specific implementation mode 2: In this implementation mode, a two-way compression experiment with a three-way orthogonal braided C / C composite material with a load ratio of 1:1 is taken as an example for specific description:

[0048] 1. Using a polarizing microscope to observe the internal microstructure of the material, it can be clearly observed that the fibers inside the material are regularly distributed, which are orthogonally distributed in the X, Y, and Z directions. The darkest area is the matrix. Carefully identify its periodicity and select Representative volume unit, and measure key dimension data within the volume unit, such as figure 1 shown;

[0049] 2. After grinding the material to the shape required by the nano-indenter, perform polishing treatment, and then conduct indentation tests on the fiber and the matrix on the nano-indenter in the direction perpendicular to the fiber bundle, and obtain a schematic diagram of the load-depth curve , according t...

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Abstract

The invention discloses a method for simulating a biaxial test of a braided composite material and determining material performance parameters by using a finite element method. The method comprises the following steps: simulating a biaxial test of a material by using finite element software based on size and space distribution conditions of fibers and matrixes obtained by a polarizing microscope technology and performances of known component materials, and determining the damage mechanism and process of the material in the test process. The simulation result of the finite element software is compared with true data acquired by a biaxial testing machine, and when the simulation result is almost completely matched with the real data, the method is effective and feasible, and the material damage process simulated by the method is quite credible. The method is simple in operation and strong in repeatability and is suitable for various complex load conditions of the braided composite material, the mechanical response of the braided composite material under the complex load conditions can be accurately and comprehensively reflected, and particularly the microscopic damage mechanism and process of the material which cannot be observed in the test can be intuitively reflected.

Description

technical field [0001] The invention belongs to the technical field of testing and measuring material parameters, and relates to a method for measuring biaxial test parameters of braided composite materials. Background technique [0002] Due to its good integrity, braided composites have been used more and more in the field of aerospace, which correspondingly increases the need to use scientific methods to characterize the properties of materials, so as to guide the design and application of materials. Using experimental methods to accurately determine material performance parameters is undoubtedly an important basic work in this need. A specific example of a woven composite material is a 3D woven composite material, which not only has reinforced fibers in the X and Y directions, but also has reinforced fiber rods in the Z direction, so as to strengthen the entire space of the material, and the fibers and A special process is used between the basics to strengthen the interf...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 徐德昇许承海张瑾瑜孟松鹤杜善义
Owner HARBIN INST OF TECH
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