【摘要】 以长丝/短纤复合纱及纯棉纱等4类纱线为对象,研究其在小变形条件下受等应力与等应变循环拉伸应力作用下的力学行为,分析比较其在不同变形率及负荷条件下的的弹性回复率、蠕变率、应力松弛率等。实验结果表明:在较低的定伸长率和较低的定负荷拉伸循环应力试验中,4种纱线的弹性回复率、应力松弛与蠕变等力学性能特征均保持在较好的范围;随着定伸长率和定负荷的增大,纱线的弹性回复率、应力松弛与蠕变等特性有明显的不同,对于循环拉伸应力作用下的保形性综合评价而言,涤纶/氨纶/棉三组分复合纱最好,其次为氨纶/棉复合纱,再其次为涤纶/棉复合纱,最差为纯棉纱。更多还原

【Abstract】 The mechanical behavior of 4 kinds of filament/staple fiber composite yarn and pure cotton yarn under the condition of isostress and isostrain of cycling tensile strength with small deformation is studied.And are also analyzed the elastic recovery rate,creep rate and stress relaxation rate under the different deformation rate and load.The results show that the mechanical properties of elastic recovery rate,stress relaxation and creep of the 4 kinds of yarns all keep in good range in the experiment of cycling tensile strength with low certain elongation and constant load;as the increase of certain elongation and constant load,the elastic recovery rate,stress relaxation and creep of the yarns have abvious difference.In terms of the conformality under the cyclic tensile strength,PET/PU/cotton composite yarn shows the best,next is the PU/cotton composite yarn,and the third is the PET/cotton composite yarn,and the pure cotton yarn shows the worst.更多还原