Stress-Strain Relation of Stretch Yarns:Part 2 : The Inter-Fiber Friction in Elongation

概要

論文の詳細を見る
The inter-fiber friction of stretch yarns in their extension process has been investigated by checking the elongation-recovery cycle curves. Results : 1) For every stretch yarn, the difference between elongation and the recovery curve of the 1st cycle is unusually large, but the difference decreases as the cycles progress. It has been ascertained experiinentally that the unusally large difference in the first cycle is due to energy dissipation by friction of inter-fibers ; and that a rather small difference in the proceeding cycles is caused by the energy absorption of the crimp extension. 2) The energy dissipation ratio by the friction of inter-fibers (EXR) and the energy absoption ratio of intra-fibers (INR) are defined as follows: EXR = e1- e3 / γ3 INR = e3-γ3 / γ3, where ei and γi indicate the work done with i'th elongation and recovery cycles, respectively. 3) For many stretch yarns, the value of EXR ranges between 0.8 and 4.3 and the energy loss of inter-fiber friction is far larger than that of crimp extension . 4) To evaluate the stress-strain relation of stretch yarn, it is necessary to give mechanical conditioning (at least 2 elongation-recovery cycles) after wet relaxing of the sample yarn.
社団法人日本繊維機械学会の論文