2 research outputs found
STUDY OF RIB KNITS COURSEWISE TENSILE PROCESS
Stretchability of knitwear is one of the most important factors of wearing comfort. Elasticity of
knitted structures in course wise direction is usually higher than along wales and often characterized by
crosswise shrinkage. Existing methods of knitting program development do not consider the real rate of
wale wise shrinkage of rib knitted structure under the course wise extension. During the study
experimental research has been carried out to fulfill empirical data on the relationship between samples’
length and width under uniaxial course wise elongation. A range of samples of rib 1Ă—1, 2Ă—2, 3Ă—3, 4Ă—4 and
5Ă—5 knits, made of cotton, bamboo, polyacrylonitrile (PAN), wool/acrylic blend and wool yarn, were
stretched with a tensile machine WDW-05M. In the process of stretching the width of each specimen was
defined in the moments of extension by 50, 100, 150, 200, 250 and 300 per cent. It has been found that
linear approximation can be applied to describe the dependence of specimen’s width on its relative course
wise elongation. It was found that the stitch height/width ratio changes unevenly. In the beginning of the
process of course wise stretching of a rib knitted structure, it does exist, such an interval, where an
increase of the knit’s linear size along the courses occurs without a significant shrinkage in the wale wise
direction. It is suggested to name the upper limit of this interval as “unidimensional extension limit” and
define it as an extension of a standard (100Ă—50mm) specimen, at which its width decreases by 10%. It was
found as well that the value of this index significantly depends on the ribbing variation and much less on
the type of raw materials
FRAME MODEL OF UNIAXIAL STRETCHING OF 1x1 RIB KNITS
One of the nowadays challenges is the development of scientific sound models of knitwear deformations. The paper is devoted to developing an algorithm for constructing a frame model of rib 1x1 knits stretched in the course or wale direction. In the process of uniaxial stretching, the shape of the sample depends on the tensile forces orientation. A frame model of a deformed knitted structure, and an algorithm of construction of a mesh frame, are developed during the study. The frame model makes it possible to find coordinates of intermeshing points of every stitch. Then yarn characteristic points can be determined that, in turn, serve as input data for the construction of 3D model of rib 1x1 structure under uniaxial tensile deformations at the yarn level of detail. The study provides a graphical tool for formalization of geometric transformation that happen during 2D deformations of knitted structures, characterized by gradual change of the specimens width crosswise to the loading direction. This model is intended to become a part of a general deformation model of knitted fabrics