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An Investigation on triaxial compression of flexible fiber packings
AIChE Journal ( IF 3.7 ) Pub Date : 2020-02-19 , DOI: 10.1002/aic.16946
Yu Guo 1 , Yanjie Li 2 , Qingzhao Liu 2 , Hanhui Jin 1 , Dandan Xu 3 , Carl Wassgren 4 , Jennifer S. Curtis 5
Affiliation  

This article examines the mechanical response of flexible fiber packings subject to triaxial compression. Short fibers yield in a manner similar to typical granular materials in which the deviatoric stress remains nearly constant with increasing strain after reaching a peak value. Interestingly, long fibers exhibit a hardening behavior, where the stress increases rapidly with increasing strain at large strains and the packing density continuously increases. Phase diagrams for classifying the bulk mechanical response as yielding, hardening, or a transition regime are generated as a function of the fiber aspect ratio and fiber–fiber friction coefficient. Large fiber aspect ratio and large fiber–fiber friction coefficient promote hardening behavior. The positions of boundaries between different regimes depend on the confining pressure and fiber flexibility. The hardening packings can support much larger loads than the yielding packings, but larger internal axial forces within fibers and larger fiber–fiber contact forces occur.

中文翻译:

柔性纤维盘根的三轴压缩研究

本文研究了受三轴压缩作用的柔性纤维盘根的机械响应。短纤维以类似于典型粒状材料的方式屈服,其中在达到峰值后,偏应力随应变增加而保持几乎恒定。有趣的是,长纤维表现出硬化行为,在大应变下应力随应变的增加而迅速增加,堆积密度不断增加。根据纤维长宽比和纤维-纤维摩擦系数,生成了将整体机械响应分类为屈服,硬化或过渡状态的相图。较大的纤维长径比和较大的纤维-纤维摩擦系数可促进硬化行为。不同状态之间的边界位置取决于围压和纤维的柔韧性。硬化盘根可以承受比屈服盘根更大的载荷,但是纤维内部的内部轴向力更大,而纤维与纤维之间的接触力更大。
更新日期:2020-02-19
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