束纤维的拉伸特性与强度—伸长间的关系

Relationships between the tensile properties and tenacity-extension behaviour of fibre-bundles

束纤维实验与单纤维实验存在差别 ,不仅测试方法和仪器有所不同 ,而且所测得的结果也有差异。采用束纤维强伸性测量方法能够得到羊毛纤维束比强度 (BS)与纤维束伸长率 (BE) ,但在分析纤维束强力曲线时存在局限性。文中提出了新的参量 ,如纤维束初始模量 (BM)、断裂比功 (BW)、峰值前断裂比功 (WBP)、峰值后断裂比功 (WAP)以及二者的比率 (WAP WBP)等。同时比较了羊毛、涤纶及粘胶人造丝三者纤维束的强伸性能。从 32批精梳毛条中抽取试样进行测试 ,结果表明 ,三者的束强力特征间 (如BS BE ,BS BM ,BS BW ,BE BW和BM BW)存在相关性。但是 ,各变量的变异系数彼此几乎不存在相关性 ,并且与束纤维力学参数平均值 (除BS CVBM和CVBM BW外 )不相关。

Fibre bundle testing is different from single fibre measurement, not only in testing methods and instruments, but in the results obtained. For wool fibres, Sirolan TENSOR can supply fibre bundle tenacity ( BS ) and bundle extension (BE) , but has some limitations on the analysis of the measured tensile curves of fibre bundles. It has not only raised new parameters, such as initial modulus (BM) and specific work of rupture (BW) , as well as the specific work before or after the peak point( WBP or WAP ) and the ratios of WAP/WBP and WAP/BW, but also compared the tensile behaviour of different fibre bundles, e.g. wool, polyester and viscose rayon fibre bundles. The experimental results from 32 lots of wool tops show that there are correlations between bundle tensile properties, such as BS BE, BS BM, BS BW, BE BW and BM BW. However, the variables of coefficients of variance (CV) are almost independent of each other and have no correlation with the average values of fibre bundle tensile parameters, except for BS CVBM and CVBM BW.