Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (10): 67-73.doi: 10.13475/j.fzxb.20190902007

• Textile Engineering • Previous Articles     Next Articles

Multi-scale simulation of impact failure behavior for 4- and 5-directional 3-D braided composites

FENG Duanpei1,2, SHANG Yuanyuan3, LI Jun1,2()   

  1. 1. College of Fashion and Design, Donghua University, Shanghai 200051, China
    2. Key Laboratory of Clothing Design and Technology (Donghua University), Ministry of Education, Shanghai 200051, China
    3. College of Polymer Science and Engineering, Qingdao University of Science & Technology, Qingdao, Shandong 266042, China
  • Received:2019-09-05 Revised:2020-07-07 Online:2020-10-15 Published:2020-10-27
  • Contact: LI Jun E-mail:lijun@dhu.edu.cn

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Abstract:

In order to simulate and predict the complex mechanical characteristics of 3-D braided composites against impact, a multi-scale meso-structure method was used to establish an equivalent combination model of 3-D braided composites to study impact behavior of braided composites. Impact damage evolution, crack propagation and energy absorption were examined numerically. 4- and 5-directional 3-D braided structures were used to prepare braided composites, and the equivalent combination model was established according to the obtained braid parameters. A drop weight impact tester equipped with a high-speed camera was used to record the fracture behavior of the 4-directional 3-D and 5-directional 3-D braided composites under low-speed impact. The 3-D braided composite equivalent combination models were validated by the fracture behavior obtained from the experiments. The simulation results show that under the same volume fraction, the axial yarn exhibits the highest energy absorption. Due to the presence of axial yarns, the 5-directional 3-D braided composites have better crack resistance and crack propagation than the 4-directional 3-D braided composites.

Key words: 3-D braided composite, model construction, impact fracture behavior, specific energy absorption, finite element analysis

CLC Number: 

  • TB332

Fig.1

Spectral slot size"

Tab.1

Specification of composite impact specimen"

纤维类型 结构 编织角
φ/(°)		 纤维体积
分数Vf/%		 试样尺寸
(L×W×H)/mm
T700-12K 三维四向 25.97 36.77 70×14×7
三维五向 23.84 32.19 70×14×7

Fig.2

Hierarchical decomposition of yarns"

Fig.3

Multi-scale braided composite model"

Tab.2

Stiffness parameters of meso-scale model RVEs"

结构 类型 Ez/
GPa		 Ey/
GPa		 Ex/
GPa		 νxx νy νz Gxz/
GPa		 Gyz/
GPa		 Gxy/
GPa
三维四向
 内单胞 24.86 4.73 4.73 0.36 0.36 0.43 8.38 8.38 5.80
面单胞 11.94 3.90 3.94 0.44 0.37 0.39 1.74 1.94 1.32
内单胞 34.18 4.51 4.51 0.33 0.33 0.40 6.53 6.53 3.82
三维五向
 面单胞 11.60 3.58 3.67 0.43 0.36 0.38 1.76 1.66 1.25

Fig.4

Schematic diagram of equivalent combination model"

Fig.5

Finite elements model of impact fracture test"

Fig.6

Impact fracture load-displacement(a) and crack propagation process of 4-directional 3-D(b) and 5-directional 3-D(c) braided composite"

Fig.7

Load-displacement curves of braided composite under impact fracture test obtained through experiment and simulation. (a) 4-directional 3-D bracided composite; (b) 5-directional 3-D braided composites"

Fig.8

Comparison on stress distribution of two kinds of braided composite. (a) Load-displacement curve obtained through simulation; (b) Stress transfer and distributions of braided composites"

Fig.9

Energy proportion of braided composites. (a) Energy absorption; (b) Specific energy absorption by FEM"

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