Bending Hysteresis of twill woven fabrics in various directions

The existing models for the prediction of bending rigidity of woven fabrics were applied here to investigating the bending hysteresis. Wide range of cotton twill woven fabrics was examined by comparing the theoretical data with the experimental results. The comparison results indicated that Peirce's, Shinohara et al' and Cooper's models can be applied to the prediction of bending hysteresis of twill woven fabrics. (2) The ratio V, introduced by Cooper, of a cotton twill fabric is found to have the range between 0.8 and 1.4. (3) The general shape of the polar diagram of bending hysteresis along the weft direction spread outward with the increase of ratio V from 0.8 to 1. (4) The general shape of bending hysteresis will collapse around the weft direction when ratio V increases from 1 and 1.4.