摘要
研究了棕榈叶鞘纤维(棕榈纤维)在4种不同隔距和准静态条件下的拉伸力学行为,应用SEM观察并分析了纤维断裂面的结构,揭示了纤维断裂的机制.结果表明,棕榈纤维的力学指标具有分散性,强度和伸长率随拉伸隔距的增大而变小,而杨氏模量则呈相反趋势.由于棕榈纤维的结构特殊,强度和模量整体呈现随纤维直径增大而变小的特点.在拉伸过程中,微纤丝取向的改变导致了纤维应力应变曲线中的非线性部分变化,断裂面结构展现了受力时4个纤维细胞的变化过程,解释了纤维的断裂机制.
In this paper, we investigated the tensile behavior under four different gauge lengths and quasi-static conditions, and the breaking surface was observed and analyzed using SEM in order to reveal the break mechanism. Results show that the mechanical indexes of palm fiber present to be scattered. The strength and elongation decrease, whereas the Young＇s modulus increases with the increasing of gauge length. According to the special structure, the strength and Young＇s modulus decrease when the fiber＇s diameter increases. During the tensile loading, a progressive alignment of the micro-fibrils with the tensile axis provides a quantitative explanation of the nonlinear in stress-strain curve. Additionally, four different processes are illustrated on breaking surfaces instructing the break mechanism of palm fiber.
出处
《河南工程学院学报（自然科学版）》
2014年第1期26-29,共4页
Journal of Henan University of Engineering：Natural Science Edition
基金
中央高校基本科研业务费专项资金资助(XDJK2013A021
XDJK2012D008)
关键词
棕榈叶鞘纤维(棕榈纤维)
拉伸强度
微纤丝角
断裂面
palm leaf sheath fiber （palm fiber）
tensile strength
micro-fibril angle
breaking surface
