Study On The Structure Of The Woven Plain Fabric Based On Mechanical Model

The fabric structure is the space interrelation among the warps and wefts in fabric. Describing the fabric structure accurately is able to get much realistic 3D simulation appearance of the fabric. Unfortunately, since the fabric structure theory is imperfect, the simulation is much distorted for complex woven, even for the simplest plain woven fabric due to the changing of the fiber material, loom tension, etc. In this thesis, from the viewpoint of yarn force in fabric, the dynamic change of yarn in fabric is studied until achieve the final balance and then obtain the position of yarns, which provides profitable research to fabric structure calculation of other weaves.In the studying under the circumstance, that simplify the structural computation of Perice Model, then to select the parameters which can influence the plain fabric structure are: yarn elastic characteristics, yarn radius, yarn tension, thread count, yarn material, warp and weft friction force, supporting force by loom temple. It is assumed that yarn is entire elastic body, regarding the ninth fabric structure phase as yarn original state; then provided the original position of every interlacing, combined the shape of yarn according to straight and curved line, analyzed the force situation with interlacing based on elastic coefficient(coefficient of stiffness, elastic-plasticity ). Calculated yarn elongation with interlacing position, and then calculated the situation resultant force and component force as well as component in every direction according to elongation and elastic coefficient, decided the movement tendency and direction of every interlacing. Given a certain step length to every interlacing in movement direction according to movement tendency, recalculated the movement tendency used above steps, if had the opposite movement tendency, then step length halved next time in the direction. Repeated doing like that until had no movement tendency or had keeping steady until equilibrium with all interlacing.Programing the MATLAB composition according to the theory, then running programs, the results show: (1): when other condition is the same, to increase the linear density, the yarn diameter was increscent that makes the interaction force and the angle of wrap between the two different interlacing increase at the same interlacing point, and then two adjacent warp interlacing caused displacement in opposite directions. The crimp level of warp yarn is increased. (2): when other condition is same, keeping the warp crimp ratio is same, to increase the weft density, the two wefts is closing, therefore the distance between them is diminishing and the force to warp is augmenting to make the warp had vertical displacement, then the bending level of warp yarn is increasing. (3): when other condition is the same, to select different fiber density with different material, the yarn density is larger, the yarn diameters is increasing, then the contact areas and interaction forces are diminishing between wraps and wefts at the same interlacing point, and then caused displacement with two adjacent warps interlacing in opposite directions, hereby, the warp is much flexible. (4): when other condition is the same, elastic modulus is increasing, the deformation is diminishing with the same tension, so the warp is hard to crimp. It can be see that the model can response the rule of changing of the plain fabric structure with different conditions, so the result of calculation is credible, and providing new way for research woven fabric of complex weaves.