基于Micro-CT图像的缎纹织物细观结构分析及渗透率预测

曹鹏军; 赵文斌; 杨斌; 倪爱清; 王继辉

doi:10.13801/j.cnki.fhclxb.20220420.002

基于Micro-CT图像的缎纹织物细观结构分析及渗透率预测

doi: 10.13801/j.cnki.fhclxb.20220420.002

1.
武汉理工大学　材料科学与工程学院，武汉 430070
2.
西安航天复合材料研究所，西安 710025
3.
武汉理工大学　材料复合新技术国家重点实验室，武汉 430070

基金项目: 科工局基础科研项目(JCKY2018207B204)

详细信息

通讯作者:
倪爱清，博士，副研究员，硕士生导师，研究方向为树脂基复合材料性能及模拟仿真　E-mail: ani@whut.edu.cn

中图分类号: TB332
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出版历程
- 收稿日期: 2022-02-11
- 修回日期: 2022-03-27
- 录用日期: 2022-04-09
- 网络出版日期: 2022-04-21
- 刊出日期: 2023-03-15

Meso-structure analysis and permeability prediction of satin fabric based on Micro-CT

1.
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
2.
Xi'an Aerospace Composites Research Institute, Xi'an 710025, China
3.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

Funds: Defense Industrial Technology Development Program (JCKY2018207B204)

摘要

摘要: 建立了确定显微计算机断层扫描技术(Micro-CT)扫描最合适分辨率的方法，并基于CT图像分析了3K五枚缎纹织物的结构，预测了渗透率。首先，将织物理想单胞模型转换为不同分辨率二维切片，考察分辨率对单胞结构、渗透率表征的影响，提出了确定Micro-CT扫描最合适分辨率的方法；其次，采用确定的分辨率对织物进行Micro-CT扫描，获取织物细观结构；最后，使用CT三维细观结构进行厚度方向渗透率数值预测，研究了织物结构的空间离散性对厚度方向渗透率的影响。结果表明：对于本文所用五枚缎纹织物，采用15 μm分辨率进行Micro-CT扫描最合适；通过Micro-CT可准确获取织物纤维束的路径及截面变化；多层织物的孔隙沿3个主方向均呈现周期性排布，且束间孔隙率均值为16.6%；使用真实CT模型的厚度方向渗透率预测结果与实验值具有良好的吻合性。
- 缎纹织物 /
- 分辨率 /
- CT图像 /
- 束间孔隙 /
- 数值模拟 /
- 渗透率
Abstract: The optimal resolution determination method of micro-computed tomography (Micro-CT) scanning was presented here based on two-dimensional slices at different resolutions for ideal unit cell model, and the meso-structure and permeability of 3K 5-harness satin woven fabric were characterized based on the CT image at the optimal resolution. Firstly, the ideal unit cell model of the fabric was converted into 2D slices at different resolutions and the effects of resolution on the characterization of cell structure and permeability were investigated. Thereafter, the optimal resolution was determined for fabric CT scanning. Then, the CT image of the fabric with the optimal resolution was used for the meso-structure and through-thickness permeability characterizations of the fabric. The results show that the optimal resolution for the CT scanning of 5-harness satin woven fabric is 15 μm. The path and cross-sectional variation of the yarns in the fabric can be obtained by Micro-CT accurately. The inter-tow voids of the multilayer fabric are arranged periodically along the three main directions with an average inter-tow porosity of 16.6%. The through-thickness permeabilities obtained based on Micro-CT are in good agreement with experimental results.
- satin fabric /
- resolution /
- CT image /
- inter-tow voids /
- numerical simulation /
- permeability

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图 1 纤维束截面特征参数

Figure 1. Characteristic parameters of fiber tows

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图 2 厚度方向渗透率测试装置

Figure 2. Through-thickness permeability testing device

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图 3 五枚缎纹织物结构形貌

Figure 3. Structural morphology of the 5-harness satin woven fabric

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图 4 五枚缎纹织物单胞模型：(a) 理想单胞几何模型；(b) 单胞体素模型

Figure 4. Unit-cell model of 5-harness satin woven fabric: (a) Geometry model of fabric unit-cell; (b) Voxel model of fabric unit-cell

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图 5 不同分辨率下五枚缎纹织物经纬纱线交错处的XY平面切片

Figure 5. 2D slices parallel to XY plane at the intersection of warp and weft yarns of 5-harness satin woven fabric at different resolutions

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图 6 不同分辨率下与XZ平面平行的五枚缎纹织物模型截面切片图

Figure 6. 2D slices of 5-harness satin woven fabric model parallel to XZ plane at different resolutions

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图 7 不同分辨率下五枚缎纹织物模型的束间孔隙率

Figure 7. Inter-tow porosity of 5-harness satin woven fabric model at different resolutions

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图 8 五枚缎纹织物试样及Micro-CT实验系统

Figure 8. 5-harness satin woven fabric sample and Micro-CT experimental system

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图 9 五枚缎纹织物CT图像中的最小单胞选取

Figure 9. Minimum unit-cell selection from CT images of 5-harness satin woven fabric

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图 10 纤维束的提取

Figure 10. Extraction of fiber tows

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图 11 基于CT图像的厚度方向渗透率预测

Figure 11. Experimental simulation of through-thickness permeability based on CT image

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图 12 五枚缎纹织物束间孔隙不同位置二维切片图

Figure 12. 2D slices of the inter-tow voids at different positions of 5-harness satin woven fabric

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图 13 沿不同切片方向变化的五枚缎纹织物单胞束间孔隙率

Figure 13. Inter-tow porosity of the 5-harness satin woven fabric unit-cells varying along different slice directions

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图 14 五枚缎纹织物经向纤维束结构特征：(a) 面内波动参数变化；(b) 面外波动参数变化；(c) 面积变化；(d) 长宽比变化

Figure 14. Structural characteristics of warp yarns of 5-harness satin woven fabric: (a) Variation of in-plane fluctuation parameter; (b) Variation of out-of-plane fluctuation parameter; (c) Changes in area; (d) Changes in aspect ratio

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图 15 基于五枚缎纹织物单胞CT图像的Z向流动仿真结果云图

Figure 15. Cloud images of Z-direction flow simulation results based on CT images of the 5-harness satin woven fabric unit-cell

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图 16 基于五枚缎纹织物单胞CT图像仿真所得的K_Z值

Figure 16. Simulated values of K_Z based on CT image of the 5-harness satin woven fabric unit-cells

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表 1 五枚缎纹织物细观几何参数

Table 1. Geometry parameters of the 5-harness satin woven fabric

Parameter		Average/μm	Coefficient of variation/%
Weft	Width	1157±41	2.8
Weft	Height	164±13	5.5
Warp	Width	1520±31	1.0
Warp	Height	144±9	3.7
Fiber diameter		7.0±1.4	7.3

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表 2 不同分辨率下五枚缎纹织物厚度方向渗透率计算结果

Table 2. Through-thickness permeability of 5-harness satin woven fabric calculated at different resolutions

Resolution/μm	45	40	35	30	25	20	15	10
Number of voxels	436020	633650	935220	1464870	2539008	5069200	11010285	39603600
K_Z/10⁻¹² m²	2.16	1.48	2.36	1.64	1.71	1.74	1.71	1.73
CPU time/min	<10	<10	<10	12	14	26	47	75
Notes: K_Z—Permeability of 5-harness satin woven fabric in thickness direction; CPU—Central processing unit.

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表 3 实验测得的五枚缎纹织物K_Z值

Table 3. K_Z values measured by experiment of 5-harness satin woven fabric

Number	Permeability/10⁻¹² m²
1	1.35
2	1.32
3	1.28
4	1.17
5	1.13
Average/10⁻¹² m²	1.25
Coefficient of variation/%	7.65

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