Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (10): 85-91.doi: 10.13475/j.fzxb.20180802007

• Textile Engineering • Previous Articles     Next Articles

Preloaded unit cell model and elastic prediction of 2-D triaxial braided composites

ZHANG Fangfang1, DUAN Yongchuan2()   

  1. 1. School of Mechanical Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
    2. Key Laboratory of Advanced Forging & Stamping Technology and Science, Ministry of Education, Yanshan University, Qinhuangdao, Hebei 066004, China;
  • Received:2018-08-06 Revised:2019-07-15 Online:2019-10-15 Published:2019-10-23
  • Contact: DUAN Yongchuan E-mail:yongchuan.duan@ysu.edu.cn

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Abstract:

Aiming at the difficulties in establishing a 2-D triaxial braided composite preloaded parameterized unit cell model, the parametric unit cell model was generated by using the voxel method to combine the discrete unit data of the deformed prefabricated parts. A periodic cubic spline was put forward for the fiber path of 2-D triaxial braided composites. Based on this spline, the material direction calculation method was established and a parametric equation describing the asymmetric lenticular plane curve was built. Considering the finite element model of the prefabricated part established by extrusion deformation, the unit cell model was generated by pre-compression using the unit cutting program. Combined with the discrete data of the deformed prefabricated element, a voxel method was used to generate a parametric unit cell model with continuous displacement on both the interface and the cell boundary. The convergence of the finite element model at different resolutions was analyzed. The results show that the elastic behavior of the 2-D triaxial braided composites could be predicted by this model.

Key words: voxel mesh, stiffness predication, parametric unit cell, 2-D triaxial braided, composite

CLC Number: 

  • TB332

Fig.1

Structural representation of 2-D triaxial braided composite"

Fig.2

Periodic spline curves"

Fig.3

Lenticular fiber bundle section"

Fig.4

Fiber orientation solution"

Fig.5

Definition of material main direction rotation angle"

Fig.6

Precast mesh extraction of 2-D triaxial braided. (a) Precast model of 2-D triaxial braided composite;(b) Enhanced phase unit cell mesh;(c) Enhanced phase cell mesh with unit coordinate"

Fig.7

Single cell mesh model of composite materials by voxel method. (a)Enhanced phase mesh;(b)Matrix mesh;(c) Mesh after superimposed"

Fig.8

Influence of volume content and angle of weaving on transverse and axial modulus of 2-D triaxial braided compositematerials. (a) Elastic modulus of transverse; (b) Elastic modulus of axial; (c) Elastic modulus of thick; (d) Shear modulus oftransverse; (e) Shear modulus of axial; (f) Shear modulus of thick; (g) Poisson ratio of transverse; (h) Poissio raton ofaxial; (i) Poisson ratio of thick"

Tab.1

Performance parameters of component materials"

材料 模量/GPa μ12
E1 E2 G12 G23
T700纤维 230 40 24 14.3 0.26
环氧树脂 4.0 - - - 0.35

Tab.2

Comparison of numerical prediction results and experimental"

α=30°, Vf=53.9% α=45°, Vf=45.1% α=60°, Vf=46.4%
单元数 Ey/GPa 实验值/GPa 单元数 Ey/GPa 实验值/GPa 单元数 Ey/GPa 实验值/GPa
40 572 57.81 68 113 37.97 354 320 27.34
95 680 60.80 59.07 108 162 40.01 37.75 753 061 30.95 28.5
765 440 61.14 865 293 40.72 1 195 833 31.03
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