基于数字图像技术的纤维织物面内渗透率表征

詹明樊; 王继辉; 倪爱清; 杨斌; 李书欣; 彭运松

doi:10.13801/j.cnki.fhclxb.20210312.008

基于数字图像技术的纤维织物面内渗透率表征

doi: 10.13801/j.cnki.fhclxb.20210312.008

1.
武汉理工大学　材料科学与工程学院，武汉 430070
2.
武汉理工大学　材料复合新技术国家重点实验室，武汉 430070
3.
中国船舶重工集团公司第七二五研究所，洛阳 471039

基金项目: 科工局基础科研项目(JCKY2018207B204)

详细信息

通讯作者:
杨斌，博士，研究方向为树脂基复合材料性能及模拟仿真　E-mail：yangbin@whut.edu.cn

中图分类号: TB332；TS107
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- 被引次数: 0
出版历程
- 收稿日期: 2020-12-31
- 录用日期: 2021-03-04
- 网络出版日期: 2021-03-12
- 刊出日期: 2021-12-01

In-plane permeability characterization of fiber fabric based on digital image technology

1.
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
2.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
3.
Luoyang Ship Material Research Institute, Luoyang 471039, China

摘要

摘要: 材料渗透率的表征受其结构空间离散性和求解方式准确性的严重影响。基于数字图像技术，评估了纤维织物渗透率的空间分布，并探讨了阶梯铺层对灌注工艺的影响。首先，从恒压单向注射实验的视频流中动态提取了流动前沿的流速分布和流动前沿角，通过织物渗透率与结构的关系仅一次实验便可求得纤维织物的面内局部渗透率分布；其次，利用正态分布函数拟合，建立了基于数字图像技术的纤维织物面内主方向渗透率张量的求解方法，并利用该方法研究了编织形式对渗透率的影响；最后，研究了阶梯铺层和恒定铺层对灌注过程的影响。结果表明：建立的基于数字图像技术的渗透率表征方法可以通过一次实验同时获取面内主方向上的渗透率及其空间离散型；在恒定铺层下缎纹织物渗透率随着纤维层数增大而增大，从厚铺层向薄铺层的灌注方式可以达到最优的灌注时间。
- 真空灌注 /
- 纤维织物 /
- 渗透率 /
- 流动前沿 /
- 数字图像技术
Abstract: The spatial discretization of the structure and the method’s accuracy have profoundly affected the characterization of material permeability. The spatial distribution of fabrics’ permeability was evaluated based on digital image technology, and the effect of step layup sequence on the infusion process was discussed. Firstly, the flow velocity distribution and the flow front angle of the flow front were dynamically extracted from the video stream of the constant pressure unidirectional injection experiments. The in-plane local permeability distribution of the fiber fabric can be obtained through only an experiment by the relationship between fabric permeability and structure. Secondly, solving method of the permeability tensor in the main direction of the fiber fabric based on digital image technology was established by fitting the normal distribution function and was used to study the influence of the weaving form on the permeability. Finally, the step layup sequence and constant layup sequence on the infusion process were studied. The results show that the in-plane permeability characterization method established based on digital image technology could simultaneously obtain the permeability in the main direction of the plane and its spatial discretization through only one experiment. The permeability of satin fabric increases with the increase of the number of fiber layers. The infusion method from thicker region to the thin region can achieve the optimal infusion time.
- vacuum infusion /
- fiber fabric /
- permeability /
- flow front /
- digital image technology

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图 1 纤维织物图片

Figure 1. Photographs of the fiber fabrics

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图 2 面内渗透率测试装置

Figure 2. Testing setup for in-plane permeability

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图 3 纤维织物阶梯铺层示意图

Figure 3. Schematic diagram of fiber fabrics under step ply

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图 4 渗透率计算流程图

Figure 4. Flow chart of permeability calculation

T—Time

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图 5 纤维织物流动前沿示意图

Figure 5. Schematic diagram of the flow front of fiber fabric

α—Flow front angle; δ—Complementary angle of the flow front angle; $\nabla $P—Pressure gradient

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图 6 缎纹织物(SF)在572 s时刻对应的灰度直方图 (a) 和流动前沿拟合图 (b)

Figure 6. Gray histogram (a) and fitting of flow front (b) of satin fabric (SF) at time 572 s

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图 7 SF部分时刻下的实验流动前沿及数据提取结果

Figure 7. Experimental flow front and data extraction results of SF at some moments

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图 8 不同各向异性程度下纤维织物流动前沿角与各向异性角关系

Figure 8. Relationship between flow front angle and anisotropy angle of fiber fabric under different degrees of anisotropy

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图 9 不同编织形式织物在45°方向灌注下流动拟合角随时间变化

Figure 9. Flow fitting angle change with time of different textiles under 45° infusion

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图 10 SF在0°方向上的渗透率云图

Figure 10. Permeability cloud diagram of SF in 0° direction

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图 11 SF在0°方向上流动前沿与时间拟合图

Figure 11. Fitting diagram of flow front and time of SF in 0° direction

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图 12 SF在0°方向上渗透率直方图

Figure 12. Permeability histogram of SF in 0° direction

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图 13 SF的细观结构

Figure 13. Mesoscopic structure of SF

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表 1 实验材料的相关参数

Table 1. Related parameters of experimental materials

Material	Type	Areal weight/(g·m⁻²)	Density/(kg·m⁻³)
Vinyl resin	ATLAC 430 LV	−	1100
Satin fabric	−	220	2550
Twill fabric	2/2 Twill	327	2550
Biaxial fabric	EKB450	455	2550
Biaxial fabric	EKB424	424	2550

下载: 导出CSV

表 2 纤维织物的面内渗透率结果

Table 2. In-plane permeability results of fiber fabric

Textile	α/(°)	K_45°/10⁻¹¹ m²	K₁/10⁻¹¹ m²	K₂/10⁻¹¹ m²	β
SF	86	2.386	2.565	2.230	0.869
Twill	78	0.521	0.662	0.430	0.649
EKB450	74	0.990	1.387	0.769	0.554
EKB424	58	9.544	25.442	5.874	0.231
Notes: K_45°—Permeability of the fabric in 45° direction; K₁—Permeability of the fabric in the fastest direction; K₂—Permeability of fabric in the slowest direction; β—Degree of anisotropy.

下载: 导出CSV

表 3 SF在均一铺层与阶梯铺层下渗透率对比

Table 3. Comparison of permeability of SF under uniform ply and step ply

Textile	Number of layers	Thickness/ mm	Average layer thickness/mm	V_f/%	K_U/(10⁻¹¹ m²)	σ/(10⁻¹¹ m²)	K_S/(10⁻¹¹ m²)	σ/(10⁻¹¹ m²)
SF	2	0.331	0.1655	52.13	2.490	0.451	4.363	0.829
	3	0.525	0.1750	49.30	2.613	0.424	3.586	0.663
	4	0.723	0.1808	47.73	2.691	0.487	2.998	0.874
	5	0.922	0.1844	46.79	2.773	0.513	2.775	0.730
Notes: V_f—Fiber volume fraction; K_U—Permeability under uniform ply; K_S—Permeability under step ply; σ—Standard deviation.

下载: 导出CSV

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