Influence of tensile straining and fibril angle on the stiffness and strength of previously dried kraft pulp fibers

July 2018 Pub Date : 2018-07-01 DOI:10.32964/TJ17.07.383
John Long, W. Batchelor
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引用次数: 1

Abstract

It has long been known that in individual wood fibers, the tensile mechanical properties are heavily determined by the nature of the cellulose chains in the fibers. Both elastic tensile modulus and strength are directly related to the fibril angle, which is the steepness with which the cellulose chains wind their way around the fiber in the secondary wall of the middle layer, named the S2 layer. Classic work from the 1970s measured modulus and strength in wood fibers as a function of the fibril angle and compared the results with theoretical models. The measurements were hampered by the presence of defects in the fibers, some which occurred naturally and others which resulted from pulp processing. In this study, we performed more accurate measurements of strength and modulus in single fibers of radiata pine by loading the fibers in cycles, gradually pulling some of the defects out of the fibers in an attempt to obtain defect-free values of modulus and strength. We then plotted these properties against measured fibril angle and compared our results with theoretical models. The results show that even when the fiber had reached maximum load before fracture, at a given value of fibril angle, it still had a measured modulus that is around half the theoretically expected value. The results suggest that the load required to fully remove defects from the fibers may be larger than the fibers can bear before fracturing.
拉伸应变和纤维角对预干燥硫酸盐浆纤维刚度和强度的影响
人们早就知道,在单个木材纤维中,拉伸机械性能在很大程度上取决于纤维中纤维素链的性质。弹性拉伸模量和强度都与纤维角度直接相关,纤维角度是纤维素链缠绕在中间层(称为S2层)第二壁纤维上的陡峭度。20世纪70年代的经典工作测量了木纤维的模量和强度作为纤维角度的函数,并将结果与理论模型进行了比较。测量受到纤维中存在缺陷的阻碍,这些缺陷有些是自然发生的,有些是纸浆加工造成的。在本研究中,我们对辐射松单纤维的强度和模量进行了更精确的测量,通过循环加载纤维,逐渐将一些缺陷拉出纤维,试图获得无缺陷的模量和强度值。然后,我们根据测量的纤维角度绘制这些特性,并将我们的结果与理论模型进行比较。结果表明,即使纤维在断裂前已达到最大载荷,在给定的纤维角度值下,其实测模量仍约为理论期望值的一半。结果表明,从纤维中完全去除缺陷所需的载荷可能大于纤维在断裂前所能承受的载荷。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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