The main content dealt with in this study is analyzing of the bending rigidity of woven fabrics as a function of fabric structure, fabric density (warp and weft spacing) and yarn counts to compare and approve the correspondence results of automatic cyclic bending tester made by Ajeli (Ajeli, Jeddi, Rastgo, & Gorga, 2009) at university of Amirkabir-Tehran with Shirley tester. And also we prepared microscopic pictures from cross section of the samples and achieved the aspect ratio of cross section of yarns in fabric structure (MATLAB software) in order to appropriate analysis of their mechanical behavior during implemented bending forces. For this purpose, five woven fabrics (plain, Twill 1/2, Twill 1/3, Twill 1/4, and Twill 1/5) are fabricated with three different densities (23, 29 and 35 warp per centimeter). The results show that the bending rigidity decreases with increasing of float yarns on both warp and weft directions. Furthermore, the value of bending rigidity on technical front side of the samples is less than technical back sides. Also there is difference between bending rigidity of weft and warp direction. There is a reasonable agreement between the measured values for both techniques.
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