Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (04): 85-92.doi: 10.13475/j.fzxb.20200809508

• Textile Engineering • Previous Articles     Next Articles

Meso-structure simulation of hexagonal braiding preforms

YANG Xin1,2, SHAO Huiqi1,3, JIANG Jinhua1,2(), CHEN Nanliang1,2   

  1. 1. Engineering Research Center of Technical Textile, Ministry of Education, Donghua University, Shanghai 201620, China
    2. College of Textiles, Donghua University, Shanghai 210620, China
    3. Innovation Center for Textile Science and Technology, Donghua University, Shanghai 201620, China
  • Received:2020-08-26 Revised:2021-01-15 Online:2021-04-15 Published:2021-04-20
  • Contact: JIANG Jinhua E-mail:jiangjinhua@dhu.edu.cn

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Abstract:

In order to study the complex structure of second generation of hexagonal braiding fabrics and predict its performance, an algorithm for simulating meso-structure was created for simulation using MatLab, which led to the establishment of models reflecting clearly the meso-structure. On the basis of the motion pattern of the second generation machine's horn gear, motion path of carriers was deduced which was used for coding. The trajectory of the yarn carrier were optimized through the use of B-spline, and Solidtube functions were used to carry out the simulation, leading to the visualization of the micro-structure. The algorithm in this text was designed on the basis of the most fundamental relation between horn gears and switch, thus it is universal to simulate hexagonal braiding structure, and the structure created by the algorithm to simulate also provided a better tool for unit cell division in finite element method. The braiding experiments of different hexagonal preforms were carried out. The results show that appearance of the simulated braiding structure resembles the experimental products, which verifies the accuracy of the algorithm.

Key words: hexagonal braiding, horn gear, meso-structure model, braiding algorithm, composite preform

CLC Number: 

  • TB332

Fig.1

Second generation hexagonal braiding machine"

Fig.2

Comparison between first and second generation horn gears. (a) First generation horn gears's chematic design; (b) Second generation horn gears's chematic design; (c) Horn gears with swithes device"

Fig.3

Principle of carriers' motion of second generation horn gears"

Fig.4

Digram of horn gear and switches"

Fig.5

Flow chart of motion trail of carrier"

Fig.6

Motion trail of carriers. (a) Motion trail of carriers on single horn gear; (b) Motion trail of carriers after considering process of switches' motion"

Fig.7

Spatial path of yarns before (a) and after (b) interpolation"

Fig.8

Solid drawing (a) and design sketch (b) of braiding fabric"

Fig.9

Braiding trail and structure of Ⅰ beam. (a)Motion trail of carriers; (b)Top view of Ⅰ beam; (c)Braiding structure of Ⅰ beam side"

Fig.10

Comparison between real and simulative braiding structure braided on braider with outer switches"

Fig.11

Comparison between real and simulative braiding structure braided on braider without outer switches. (a) Horn gear group without outer switches; (b)Real braiding structure; (c) Simulative braiding structure"

Fig.12

Comparison of braiding structures between first and second generation braiding machines. (a)Two-layer plate; (b)Braiding structures of first generation machine; (c)Braiding structures of second generation machine"

Fig.13

Cross section model of first (a) and second (b) generation braided structure"

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