Yarn Tensile Property for Analysis

Abstract

Along with the woven structure, the material property of the yarn that is intensified or weakened under the woven deformation will be a primary factor to govern the mechanical characteristics of fabrics. Out of these diversity the attempt to grasp the material non-linearity of the yarn, that is the three dimensional assemblies of filaments has been made actively. However, the experimental research to evaluate the heterogeneous characteristics of the yarn has not carried out popularly.In the first part of this paper, the non-linear and non-homogeneous material properties of the yarn under the tensile and compressive deformation are cleared up by experiment. Secondly, for the purpose of introducing the optimum yarn property to designing system on woven fabrics, the effect of tensile and compressive properties of the yarn on the uniform biaxial tensile characteristics of plain weaves is cleared up by an analytical research.It is made clear that the material property of the yarn against tensil deformation shows an essentially nonhomogeneous and non-linear characteristics influenced by the specimen length. Subsequently, the unsymmetric shape deformation and heterogeneous distribution of filaments in the yarn cross section subjected to compressive displacement can be observed by a microscope. Also the non-linearity of compression ratio α, indicated in the previous paper can be measured. The influence of heterogeneous property of the yarn upon tensile deformation of plain weaves is cleared up by analyzing the uniform biaxial extension of plain weaves, especially in its large deformation area. And it is considered that the available guideline for the practical woven design can be given by taking into account of the average filament length of the yarn for the tensile rigidity of the consituent rahmen element and using 1/4 to 1/2value as compression ratio α.