Finite Element Analysis Of The Tensile Deformation Process Of Slub Yarn

Slub yarn is a kind of fancy yarn, whose knots distribute regularly or irregularly, because of the unique structure, the fabric made of the slub yarn has flax-like style, and is be popular in the market. However, due to unevenness of slub yarn and the irregular distribution of slubs, the overall fracture strength of yarn has been affected, and the breaking frequency will increase during the pinning and weaving process. In addition, the number has great effect on the breaking strength of slub yarn. In order to reduce breakage and improve fabric strength, the spinning number of slub yarn can be limited, which generated a great obstacle to development of the slub yarn fabrics. Therefore, the study of the mechanical properties of slub yarn become an important issue. At present, theoretical method and experimental method are mainly used in the study, but the experimental method is time consuming, and the result is unsatisfactory. By contrast, theoretical method is more reliable and effective. In this paper, a new theoretical method is made use of, that analyze by finite element method(For short of FEM) and simulate with computer software, which not only saves time and manpower, also fits with the experimental results. The data shows that the result more convincing.Yarn twisting has greatly affects on breaking strength; twisting process can be taken as a displacement of fibers in the body of yarn. The twist has great effects on the strength of slub yarn; the twisting can be seen as the displacement of fibers in the body of yarn. Firstly, we obtained strain- stress differential equation of the cross-section of the slub yarn according finite element method. The length of transition section will also be changed with the length of slub. With finite element software ANSYS, we simulated the transformation of fibers and got the displacement-strain curve of fibers with the mapping function in ANSYS. This paper displays the application of computer simulationin in textile, and verifies the conclusion that strain of fibers are decreasing from the outer layer to the inner at a theoretical point of view.From the previous study, we can get the result as follows: there is no change in the length of base yarn of slub yarn, but the length of slub is changed, it has some effects on the distribution of fracture locations. The research mainly analyzed the force of slub yarn in different slub length, and the contrast of strength between the slub yarn and the normal yarn with when they have the same line density.With finite element software——ANSYS, we simulated the tensile fracture of slub yarn in different slub length. Then, through comparing the simulation with the real one, we can required the two curves with EXCEL. After the calculation of breaking strength in MATLAB, we got the the function of multiplication. For checking the accuracy of the above function, we tested the conformity of practical scattered points and fitting curve of function with MATLAB.