Mathematical Models Describing the Creep and Stress Relaxation Behavior of False Banana’s Fiber (Ensete Ventricosum)

ABSTRACT

Viscoelastic behavior is an important parameter for the use of natural fibers in technical applications. Mathematical models to describe the relaxation and creep behavior of Ensete fibers were investigated. The aim of the experiment was to describe the short-term creep and relaxation behavior under tension loading. The fibers of Ensete ventricosum, originally from Ethiopian region Hawasa, were used in this experiment. Moisture content Mc = 8.54 ± 0.42% (d. b.) of the samples were determined. The viscoelastic tests were performed at six load levels (15, 30, 45, 60, 75, and 90% of yarn breaking load). Measured values of the relaxation and creep behavior were fitted to the mathematical models. The results show that generalized Maxwell model and Kelvin-Voight model with two branches can be used to describe relaxation and creep behavior of Ensete fibers.

摘要

粘弹性行为是在技术应用中使用天然纤维的一个重要参数.研究了复合纤维的松弛和蠕变行为的数学模型.实验的目的是描述拉伸载荷下的短期蠕变和松弛行为.本实验采用了原产于埃塞俄比亚哈瓦萨地区的整体心室肌纤维。测定样品的含水量Mc = 8.54±0.42%（d.b.）.粘弹性试验在六个载荷水平（15%、30%、45%、60%、75%和90%的破纱载荷）下进行.将松弛和蠕变行为的实测值拟合到数学模型中.结果表明，两分支的广义麦克斯韦模型和开尔文-沃伊特模型可以用来描述整体纤维的松弛和蠕变行为.

KEYWORDS:

• Rheology
• Maxwell model
• Kelvin model
• tensile testing
• plant material
• natural fibre

关键词:

• 流变学
• 麦克斯韦模型
• 开尔文模型
• 拉伸试验
• 植物材料
• 天然纤维

Additional information

Funding

This work was supported by the Internal Grant Agency of Faculty of Engineering—Czech University of Life Sciences Prague [2019: 31130/1312/3119].