Measuring Technic Research About Bending Form Of The Fabric,Which Based On Grate Lighting And Imaging Technic

The fabric’s bending performance is one of an important mechanical and physicalproperties of fabrics, and determines the fabric handle to a certain extent, as people’s attentionto style of the fabric and fabric is widespread used in other areas of non-clothing. The fabric’sbending performance has gradually attracted people’s attention, become its important factorsin actual use and overall performance evaluation.Bending stiffness of the fabric quantify its bending performance, bending form of thefabric objectively reflect its’ bending performance. The existing evaluation aboutperformance of the fabric mostly focus only on its bending stiffness, the specific form ofbending is always overlooked, otherwise, the same of bending stiffness value may turn ondifferent bending form, and the different bending stiffness value may turn on similar bendingform, therefore only comprehensive consider both of them that fully grasp performance of thefabric. Therefore, theoretic and technical research about the bending form of the fabric canmake up the shortage of evaluation about its’ bending performance, and improve the existingindex system of evaluating about the bending performance of the fabric, have importantpractical significance.The subject in-depth analyze the existing fabric bending theories and methods ofperformance testing on the basis, for issues about the fabric bending performance is notperfected on the characterization and lack of characterization of the fabric bending shape,doing some research. Then the traditional slope method as a platform, designed lighting grateand a simple imaging measuring system device, the use of image processing technologycombined with mathematical analysis and calculation of the bending of the fabric patternswere tested and studied. By using image processing program written in the Delphi forbending the specimen surface a series of discrete points, and the preparation of a curve fittingcomputer program to simulate the curved shape of the actual sample, definitions, calculationsand discuss the characterization of the specimen bending form the various indicators.Use testing technology of this subject, not only by calculating the flexural rigidity of thefabric can be the value, the most important is to improve the existing research on the lack offabric bending form, proposed curvature curve, the curvature integral value, the value ofmaximum curvature and the concept of minimum curvature values. Curvature of the curvecan qualitatively characterize the overall fabric bending patterns; curvature integral value canbe quantitatively characterized by bending the fabric of the overall shape; maximumcurvature value and the minimum curvature value can bend the fabric of local shapedescription. At the same time bending the fabric patterns are defined, respectively, before thebending type, the bending-type, after type bend, bend at both ends-and uniform type.Obtained by testing the value of bending stiffness of the fabric and FAST-2style instrument tests the fabric bending stiffness values obtained by regression analysis and foundhigh consistency between the two of then, come with the fabric bending stiffness is inverselyproportional to the curvature integral conclusion is verified by regression analysis, in order toachieve a form of fabric bending performance indicators for the quantitative characterizationof the fabric; by the curvature of the curve with the curvature integral values, maximum andminimum curvature values of a good prediction of the fabric of the specific bending shape,improved the index system which about evaluating the fabric bending performance.