Evaluation of the Nonuniformity of Filaments Based on Data from Pulsed-Acoustic Tests of Complex Chemical Fibres

The values of the elongation at break of filaments in a complex fibre are found by the method of combining the stress-strain diagrams and acoustic emission spectra of fracture of complex fibres. Experimental data are used to assess the correspondence of the empirical law of distribution of the elongation at break of filaments to the theoretical (normal) law. The behavior of filaments in extension of a complex fibre to breaking is described with the concepts of reliability theory and the statistical indexes characterizing the nonuniformity of the filaments and the working capacity of a complex fibre in elongation close to the elongation at break are calculated. Complex fibres fabricated by melt spinning (polyester, polypropylene) have higher reliability reserves than fibres wet-spun from solution (viscose). The results are of practical importance and can be used for optimizing industrial manufacture and processing of complex fibres.