Random distribution and generation method of fibers in unidirectional fiber reinforced composite material

A technology of reinforced composite materials and unidirectional fibers, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of fiber overlap and low calculation efficiency, and achieves a simple and clear method, reducing calculation time, and high efficiency. The effect of computational efficiency

Active Publication Date: 2017-01-04
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0003] When the traditional Monte Carlo sampling method is used for random sampling, the sampling points tend to be concentrated in a certain area. For the randomly distributed fibers generated by simulation, the fibers are prone to overlap, resulting in low computational efficiency.

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  • Random distribution and generation method of fibers in unidirectional fiber reinforced composite material
  • Random distribution and generation method of fibers in unidirectional fiber reinforced composite material
  • Random distribution and generation method of fibers in unidirectional fiber reinforced composite material

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Embodiment Construction

[0032] The method of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] Such as figure 2 Shown is a flowchart of the steps of the present invention. In this embodiment, the random distribution of fibers with a fiber volume ratio of 60% is simulated as an example, and the rectangular size of the cross-section of the composite material is 200 μm×50 μm; l min is the shortest distance allowed between the first fiber and its neighbors, l max is the maximum distance allowed between the first fiber and its adjacent fibers, in the embodiment, l min =0,l max = 1.6 μm; fiber diameter d is 6.6 μm. Such as image 3 As shown, a coordinate system is established on the cross-section of the fiber reinforced composite material, the lower left corner is the coordinate origin, the right side is the positive direction of the x-axis, and the right above is the positive direction of the y-axis; the specific st...

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Abstract

The invention belongs to the technical field of mechanical engineering, and particularly relates to a random distribution and generation method of fibers in a unidirectional fiber reinforced composite material. The method comprises the following steps that 1, a first fiber is generated on the cross section of the fiber reinforced composite material; 2, adjacent fibers of the first fiber are generated and defined as second-generation fibers; 3, according to the method of generating the adjacent fibers of the first fiber in the second step, all the fibers in the second-generation fibers are treated one by one, adjacent fibers are generated and defined as third-generation fibers, adjacent fibers are sequentially generated generation by generation till the circle centers of the fibers of one generation are all outside the cross section area of the fiber reinforced composite material, and the generation process is finished. According to the random distribution and generation method of the fibers in the unidirectional fiber reinforced composite material, the random characteristics of fiber distribution can be simulated, the volume ratio of the fibers can be increased to 70% or above, less sampling is achieved on the premise that the random characteristics of the fibers are not changed, the operation efficiency is improved, and the time is shortened.

Description

technical field [0001] The invention belongs to the technical field of mechanical engineering, and in particular relates to a method for generating random distribution of fibers in unidirectional fiber-reinforced composite materials. Background technique [0002] Fiber-reinforced composites (FRP) have been widely used in aircraft, vehicles, ships and other equipment. However, the mechanical properties of FRP are greatly dispersed due to the influence of the production process. By observing the cross-section of FRP with a scanning electron microscope, it is found that the distribution of fibers on the cross-section of the composite material is a disordered random state, such as figure 1 Shown is the distribution of fibers on the substrate. The random distribution of fibers on the cross-section of the composite material will cause the change of the local fiber volume ratio in the cross-section, and the mechanical properties of the composite material have an important relatio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 章力张书锋蒋远翔陈循
Owner NAT UNIV OF DEFENSE TECH
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