Study on fiber fracture sequence during yarn tensile fracture via acoustic emission method
Xueyu Zhang, Binjie Xin, Yuansheng Zheng, Meiwu Shi, Lantian Lin, Cong Gao, Yanan Yi, Zumin Yang, Handian Li
Abstract
via the acoustic emission technology, a method used for investigating the single fiber fracture sequence during tensile fracture process of blended yarn, which is made of different kinds of fiber was presented in this paper. As the fibers aggregate together after spinning process, the tensile strength of the yarn mainly originates from the strength of the fibers inside the yarn, as well as the cohesive force and surface friction between the fibers. In order to collect the acoustic emission signals generated during tensile fracture of the yarn and different single fibers, the acoustic emission technology was adopted. Firstly, the time-frequency matrix of the acoustic emission signal was constructed on the basis of Hilbert-Huang transform; subsequently, the singular value of the signal was obtained by singular value decomposition of the time-frequency matrix of the signal; ultimately, the singular value of the signal was judged by the fuzzy c-means cluster analysis. The results showed that the singular value can be used not only to characterize the fractures of different kinds of fiber in an efficient way, but also to identify the fiber fracture sequence during tensile fracture process of blended yarn, providing an excellent theoretical support for researching into the yarn formation process.