Determination of the bending characteristic parameters of the bending evaluation system of fabric and yarn

The bending evaluation system of fabric and yarn (BES-FY) can measure the bending, weight, friction and tensile properties of fabric and yarn through a pull-out test and delineate the relationship between the mechanical geometry and the corresponding deforming process, so as to quantify the comprehensive hand of fabric and yarn. The bending process of the BES-FY system was mainly investigated in the present study. Two bending models were developed under different conditions and the corresponding formulae for bending rigidity were also obtained. The optimum point and range for calculating the bending rigidity was acquired by experimental and analytical investigation, which involved study of the relationships between bending rigidity-curvature. These can be divided into three sections, namely, linear, quadratic and constant function, and through the comparisons between the bending rigidity of the two bending models and that of KES-FB2 and FAST-2, the better bending model was selected to characterize the bending properties of fabric and yarn.