Failure mechanism in staple yarns

The failure mechanism in staple yams is strongly influenced by yam structure. Manufacturing methods impose certain constraints on the disposition and distribution of fibers in the yam cross section. This paper investigates the failure mechanism in ling, rotor, air-jet, and vortex yarns. The yams are subjected to uniaxial loading on a tensile tester, and images of the yams before and after breaking are recorded. Image analysis of the failure regions yields some interesting features and reveals typical mechanisms occurring in different yam structures. The failure mechanism in each yam type is discussed in terms of some basic parameters characteristic of the structure.