Experimental Study on Single Fiber Tensile Properties of Sisal Fibers Using a Digital Image Correlation Method as a Strain Measurement

ABSTRACT

The development of natural fibers in engineering applications requires an accurate measurement of their dimensional characteristics and mechanical properties. Fiber cross-sectional area (CSA) obtained from lateral dimensional measurements should consider the specific cross-sectional shape (CSS) of the fibers and their wide lengthwise variations. In this study, the dimensional measurements of water-retted and unretted sisal fibers were conducted by laser scanning microscopy (LSM) and calculation-based methods. Single fiber tensile tests were performed using the digital image correlation (DIC) method. Results show that the diameters of water-retted and unretted fibers measured by LSM were 233 ± 45 µm and 236 ± 42 µm, respectively. The diameters of water-retted and unretted fibers obtained by calculation were 192 ± 17 µm and 178 ± 20 µm, respectively. The tensile strengths of water-retted and unretted fibers were 679 ± 118 MPa and 718 ± 106 MPa, respectively. The strain at failure and elastic modulus of water-retted and unretted fibers were 2.0 ± 0.6% and 34 ± 8 GPa, as well as 1.5 ± 0.2% and 48 ± 6 GPa, respectively. Water retting seems to predominantly influence the strain at failure and elastic modulus of sisal fibers, as confirmed by the ANOVA analysis.

摘要

天然纤维在工程应用中的发展需要精确测量其尺寸特性和机械性能. 从横向尺寸测量中获得的纤维横截面面积（CSA）应考虑纤维的特定横截面形状（CSS）及其广泛的纵向变化. 本研究采用激光扫描显微镜（LSM）和基于计算的方法对水脱胶和未脱胶剑麻纤维的尺寸进行了测量. 使用数字图像相关（DIC）方法进行单纤维拉伸试验. 结果表明，用LSM测量的水脱胶和未脱胶纤维的直径分别为233 ± 45 µm和236 ± 42 µm. 通过计算获得的水脱胶和未脱胶纤维的直径分别为192 ± 17 µm和178 ± 20 µm. 水脱胶纤维和未脱胶纤维的拉伸强度分别为679 ± 118MPa和718 ± 106MPa. 脱胶纤维和未脱胶纤维的破坏应变和弹性模量分别为2.0 ± 0.6%和34 ± 8GPa，以及1.5 ± 0.2%和48 ± 6GPa. ANOVA分析证实，水脱胶似乎主要影响剑麻纤维的失效应变和弹性模量.

KEYWORDS:

• Sisal fiber
• water-retted fiber
• unretted fiber
• dimensional analysis
• optical techniques
• mechanical properties

关键词:

• 剑麻纤维
• 水浸渍纤维
• 未经修饰的纤维
• 维度分析
• 光学技术
• 机械性能

Acknowledgments

The authors are pleased to acknowledge the support of the colleagues from the Arenberg and Bruges campuses of KU Leuven. The authors also thank the secretary office of Arenberg campus - KU Leuven and the student services office of Bruges campus - KU Leuven for their support in providing consumable laboratory goods.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

The data used to support the findings of this study are included within the article.

Additional information

Funding

This work was financed by the IUPEPPE project under the framework of collaboration of the Ministry of Education (Ethiopia) and KU Leuven (Belgium).