Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (11): 52-58.doi: 10.13475/j.fzxb.20210911207

• Textile Engineering • Previous Articles     Next Articles

Measurement of micro deformation of yarns and fabrics based on digital image correlation method

WANG Mingliang1, ZHANG Huile2, YUE Xiaoli1, CHEN Huimin1()   

  1. 1. College of Mechanical Engineering, Donghua University, Shanghai 201620, China
    2. Yangtze Delta Research Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, Zhejiang 313000, China
  • Received:2021-09-29 Revised:2022-01-12 Online:2022-11-15 Published:2022-12-26
  • Contact: CHEN Huimin E-mail:ch_huimin@dhu.edu.cn

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Abstract:

In order to measure the tensile deformation of yarns and structural repeat in fabrics accurately and continuously, a method for uniaxial tensile test was proposed in micro scale based on a digital image correlation method (DIC). Four types of fabric were selected, and yarn samples were acquired from the fabrics before the fabrics were cut into testing samples. A designed speckle pattern was made on each sample. As the next step, the yarn and fabric samples were subjected to uniaxial tensile tests and the whole process was recorded by camera. Extensometers were introduced in the DIC testing software to calculate the linear strain of segmented parts on single yarn and the linear strain of fabric along the warp and weft directions. The results show that the linear strain increases at different rates in each part on the yarn during the tensile process. When the fabric is stretched by small deformation, the deformation of fabric is non-uniform, especially for weft knitted fabrics. The method to measure the micro deformation based on DIC reveals the deformation patterns for yarns and fabrics in production and application, and it provides information for the design and application of intelligent wearable electronic textiles.

Key words: digital image correlation method, micro scale, linear strain measurement, textile testing

CLC Number: 

  • TS101.8

Tab.1

Sample specification"

试样
编号		 织物成分 织物类型 面密度/
(g·m-2)		 纱线线密度/
tex
1# 涤纶 平纹机织 120 13.0
2# 棉 纬编针织 160 22.4
3# 棉 纬编针织 140 18.2
4# 涤/棉
(65/35)		 纬编针织 144 14.6

Fig.1

Diagram of samples.(a) Sample of yarn; (b) Sample of fabric"

Fig.2

Speckle pattern.(a) Fabric 1#; (b) Fabric 2#; (c) Fabric 3#; (d) Fabric 4#"

Fig.3

Lab environment.(a) Experimental scene of yarn; (b) Experimental scene of fabric"

Fig.4

Calibration of DIC measuring.(a) Calibration of yarn; (b) Calibration of fabric at micro level"

Fig.5

Schematic diagram of DIC-2D measuring"

Fig.6

Options of extensometers.(a) Selection of extensometers on yarn; (b) Selection of extensometers on loop"

Fig.7

Variation curve of extensometers in warp yarn 1#"

Tab.2

Range of extensometers’ strain rate in yarn"

试样
编号		 引伸计应变速率/ (%·s-1)
最大值 最小值
1# -A1 0.277 0 0.202 3
1# -A2 0.266 9 0.175 2
1# -A3 0.223 2 0.169 1
1# -A4 0.412 3 0.111 0
1# -A5 0.386 3 0.199 9
1# -A6 0.458 3 0.093 6
2# -A1 0.248 8 0.137 6
2# -A2 0.278 3 0.118 8
2# -A3 0.257 3 0.101 2
3#-A1 0.178 6 0.104 5
3#-A2 0.215 4 0.098 6
3#-A3 0.243 3 0.094 1
4#-A1 0.155 9 0.079 9
4#-A2 0.205 7 0.091 3
4#-A3 0.192 3 0.109 2

Fig.8

Strain trend of extensometers in yarn"

Fig.9

Variation curve of extensometers by warp tensile"

Fig.10

Variation curve of extensometers by weft tensile"

Tab.3

Standard deviation of extensometers’ strain"

织物
编号		 纵向拉伸
应变标准差/%		 横向拉伸
应变标准差/%
伸长 收缩 伸长 收缩
1# 0.329 6 0.194 8 0.599 9 0.393 6
2# 1.270 5 1.249 2 0.352 4 0.645 5
3# 0.440 9 0.617 6 0.378 2 0.435 8
4# 0.645 4 0.667 1 0.348 9 0.481 0
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