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Method for generating monofilament random position with high fiber volume content

A volume content, random position technology, applied in computer-aided design, special data processing applications, instruments, etc., can solve the problem that the randomness of fibers cannot be guaranteed

Pending Publication Date: 2020-12-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Due to the initial regular arrangement, the gap between the fibers is very small at high fiber volume content, the later collision process is limited, and the randomness of the fibers cannot be guaranteed

Method used

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  • Method for generating monofilament random position with high fiber volume content
  • Method for generating monofilament random position with high fiber volume content
  • Method for generating monofilament random position with high fiber volume content

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Embodiment Construction

[0069] In order to illustrate the technical solution of the present invention more clearly, the technical solution of the present invention is described in further detail below in conjunction with the accompanying drawings:

[0070] Such as figure 1 Described, a method for generating random positions of monofilaments with high fiber volume content, specifically includes the following steps:

[0071] Step (1.1), setting of initial fiber distribution position and initial velocity: on the basis of given fiber volume content, fiber radius, window length and window height, the initial arrangement of each fiber point is given by the hexagonal close-packed distribution method. cloth position (x, y); the initial random velocity (u, v) of each fiber is given by the random number generator function;

[0072] Among them, the initial position and initial speed: Given that the average diameter of the T300 carbon fiber monofilament is 7 μm, the average diameter of the T800 carbon fiber mon...

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Abstract

The invention discloses a method for generating a monofilament random position with high fiber volume content, which relates to the technical field of composite materials and comprises the following steps of: (1) giving an initial fiber distribution position and an initial speed; (2) establishing a fiber collision method and a fiber-window collision method; (3) realizing a complete periodic boundary condition; (4) identifying the space size and increasing the fiber volume content; and (5) performing statistical evaluation and finite element model verification. After a fiber distribution randommodel with high fiber volume content is established, the reliability of the model is verified through statistical analysis, prediction of fiber bundle rigidity and strength and test comparison. According to the method, the high-fiber-volume-content fiber monofilament geometric model with good randomness can be generated, the model has complete periodic boundary conditions, the spatial distribution of the fibers in the composite material is truly reflected, and the method can be used for establishing a mesoscale fiber bundle finite element model to predict the strength and rigidity performanceof the fiber bundle.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a method for establishing a mesoscopic geometric model of fiber monofilament reinforced composite materials. Background technique [0002] In the actual curing process, there are often the formation of resin-poor regions and resin-rich regions, resulting in the inhomogeneity of the internal mechanical properties of the composite material. Therefore, considering the random arrangement of fibers, obtaining geometric characteristics that are consistent with the actual situation becomes a mesomechanics key to analysis. Generally speaking, the generation method of random fiber distribution meets the following points: (1) the fiber monofilaments cannot overlap; (2) the distance between fiber monofilaments should not be too small, so as not to cause the distortion of the finite element mesh, generally greater than The smallest unit size or 0.07 times the radius of the monof...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F113/26G06F119/08G06F119/14
CPCG06F30/23G06F2113/26G06F2119/08G06F2119/14
Inventor 张宏建崔海涛温卫东李帅徐颖
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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