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ABSTRACT
Cotton fiber is a kind of cellulosic fiber and is widely used in textile. To legitimately determine the parameters of compressive force properties of cotton fiber assembly, axial stress was set up through a uniaxial quasi-static loading experiment on cotton fiber assembly. The constitutive model was built for cotton fiber assembly with viscoelastic plastic theory to calculate its mechanical parameters. The results showed that the viscoelasto plastic model was established to characterize the mechanical response. The constitutive model of stress and time had been adopted at the compression and relaxation processes. The viscoelastic constitutive model can be used to describe the densifying process. Loading cycles, compression velocity, and humidity on the parameters were also investigated by analyzing the E1, E2, η2, loading cycles, and humidity showed significant influence on mechanical parameters. The E1, E2, and η2 values of Stage II were lower than others because the cotton fiber assembly of Stage II was an unsteady structure. The E1 values were almost higher than the E2 values, the E1, E2, and η2 values of Stage III and recovery were much higher than others. The senior viscoelastic stage of cotton fiber assembly mainly showed elastic deformation from loose and disordered fiber structures.
摘要
棉纤维是一种纤维素纤维,广泛应用于纺织业. 为了合理确定棉纤维集合体的压缩力学参数, 通过对棉纤维集合体进行单轴准静态加载实验, 建立了轴向应力. 利用粘弹塑性理论建立了棉纤维组件的本构模型,计算了其力学参数. 结果表明, 建立了粘弹塑性模型来描述结构的力学响应. 在压缩和松弛过程中采用了应力和时间的本构模型. 粘弹性复合模型可以用来描述致密化过程. 通过分析加载周期、压缩速度和湿度对力学参数E1、E2、η2的影响, 发现加载周期和湿度对力学参数有显著影响. 第二阶段的E1、E2和η2值低于其他阶段, 因为第二阶段的棉纤维集合体是一个不稳定的结构. E1值几乎高于E2值, III期和恢复期的E1、E2和η2值远高于其他值. 棉纤维集合体的高级粘弹性阶段主要表现为纤维结构松散无序的弹性变形.
Disclosure statement
No potential conflict of interest was reported by the author(s).