Micromechanical characterization of cellulose fibers
Micromechanical characterization of cellulose fibers
复制标题
纤维素纤维的微观机械表征
DOI：
10.1016/s0142-9418(01)00119-2
复制
发表时间：
2002
期刊：
影响因子：
5.1
通讯作者：
J. Lambros
中科院分区：
文献类型：
--
作者：
M. Kompella;J. Lambros
这里提出的工作的目的是对个别纤维素纤维的微观力学性能的表征。特别是，我们的兴趣是在确定弹性模量，拉伸强度和拉伸伸长率的棉和木基纤维素纤维。测试是在微尺度下进行的，对长度为几毫米、宽度为几十微米的单根纤维进行测试，之所以选择这种尺度是因为这种纤维通常用作工业原材料。自行设计并制作了一台纤维微拉伸试验机。精细分辨率步进电机（每步10 nm）为微拉伸载荷框架提供驱动，纤维中的载荷通过高灵敏度测力传感器（0.01 mN分辨率）测量。整个组件被放置在变焦立体显微镜下，用于帮助样品安装和视觉记录实验的双重目的。在对装置进行校准之后，当测试棉基纤维素纤维和木基纤维素纤维两者时均获得了良好的结果。两种纤维的平均杨氏模量分别为4 GPa和2 GPa。然而，发现这两种纤维的失效应力变化很大，因此需要假设失效的威布尔分布进行统计分析。在此基础上，得到棉纤维素纤维的平均强度为496 MPa，木纤维素纤维的平均强度为164 MPa。
The work presented here aims towards the characterization of micromechanical properties of individual cellulose fibers. In particular, our interest is in determining the elastic modulus, tensile strength and tensile elongation of cotton and wood based cellulose fibers. Testing is conducted at a microscale, on single fibers of a few millimeters in length and tens of microns in width, a scale so chosen because such fibers are commonly used as industrial raw materials. An in-house microtensile fiber tester was designed and fabricated. A fine resolution stepper motor (10 nm per step) provides the actuation for the microtensile load frame and load in the fibers is measured by a high sensitivity load cell (0.01 mN resolution). The entire assembly is placed below a zoom stereo microscope for the dual purpose of aiding in specimen mounting and visually recording the experiment. After calibration of the device, good results were obtained when testing both the cotton and wood based cellulose fibers. Average Young's moduli of 4 GPa and 2 GPa were found for the two fibers, respectively. However, a large variation in failure stress was found for the fibers of both kinds, necessitating a statistical analysis assuming a Weibull distribution of failure. Based on this, mean strengths of 496 MPa for cotton cellulose fibers and 164 MPa for wood cellulose fibers were obtained.