Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (09): 89-94.doi: 10.13475/j.fzxb.20210302706

• Textile Engineering • Previous Articles     Next Articles

Finite element modeling and simulation of cotton fiber assembly compression based on three-dimensional braided model

WU Fan1, LI Yong2, CHEN Xiaochuan1(), WANG Jun3, XU Minjun1   

  1. 1. College of Mechanical Engineering, Donghua University, Shanghai 201620, China
    2. College of Mechanical and Electronic Engineering, Tarim University, Alar, Xinjiang 843300, China
    3. College of Textiles, Donghua University, Shanghai 201620, China
  • Received:2021-03-08 Revised:2022-05-26 Online:2022-09-15 Published:2022-09-26
  • Contact: CHEN Xiaochuan E-mail:xcchen@dhu.edu.cn

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Abstract:

In order to analyze the stress of cotton fiber assembly in compression and improve the quality of cotton bales, a new model for three-dimensional braided composites is established. In this model, cotton fiber bundles were assumed to have the same circular cross-section and arranged according to the three-cell structure of three-dimensional four-direction braided composites. The model was subjected to compression analysis assuming a cotton fiber assembly, and the relationship between compressive stress and relative density was analyzed with the variation of cotton fiber stress. In addition, the influence of moisture regain on the compressive stress of cotton fiber assembly was analyzed. The results show that the stress of cotton fiber assembly decreases first and then increases as the moisture regain is increased. When the moisture regain is between 8.8% and 12.3%, the stress of cotton fiber is the minimum. The finite element analysis results are consistent with the experimental results, demonstrating the validity of the model.

Key words: cotton fiber assembly, finite element model, compression, moisture regain, stress, cotton bales

CLC Number: 

  • TS101

Fig.1

Unit cell geometry model of cotton fiber assembly. (a) Internal unit; (b) Surface unit; (c) Angle unit"

Fig.2

Solid model of cotton fiber assembly"

Tab.1

Compressive modulus of cotton fiber assembly when moisture regain is 8.8%"

相对密度 压缩模量/MPa 相对密度 压缩模量/MPa
0.043 0.003 5 0.068 0.034 8
0.046 0.004 6 0.074 0.053 2
0.048 0.006 1 0.082 0.088 4
0.051 0.008 3 0.091 0.148 2
0.055 0.011 3 0.103 0.263 8
0.059 0.016 3 0.117 0.506 0
0.063 0.023 5 0.121 0.613 9

Fig.3

Finite element model of cotton fiber assembly"

Fig.4

Stress nephogram of cotton fiber assembly when moisture regain is 8.8%. (a) Compression ratio is 30%; (b) Compression ratio is 45%; (c) Compression ratio is 60%; (d) Compression ratio is 65%"

Fig.5

Relation between compressive stress and compressive ratio (a) with relative density (b)"

Tab.2

Comparison of compressive stress between FEA results and experimental results of cotton fiber assembly"

压缩
率/%		 相对
密度		 压应力/MPa 相对
误差/%
有限元分析值 压缩试验值
35 0.063 0.000 60 0 —
40 0.068 0.001 09 0.000 51 113.7
45 0.074 0.001 94 0.001 53 26.8
50 0.082 0.004 25 0.004 59 7.4
55 0.091 0.009 00 0.010 19 11.7
60 0.103 0.019 56 0.021 91 10.7
65 0.117 0.052 99 0.046 00 13.0

Fig.6

Curves of compressive modulus and relative density of cotton fiber assembly with different moisture regains"

Fig.7

Stress nephogram of different moisture regain cotton fiber assembly at 65% compression ratio"

Tab.3

Fiber stress values of different moisture regain cotton fiber assembly of FEA results"

回潮率/% 弯曲区域纤维应力/MPa 滑移区域纤维应力/MPa
4.2 >0.37 <0.19
6.6 >0.26 <0.13
8.8 >0.17 <0.09
10.7 >0.16 <0.08
12.3 >0.16 <0.08
14.1 >0.24 <0.12
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