On-Line Measurement of Fabric Bending Behavior

Abstract

A generalized fabric bending model is developed based on the nonlinear bending moment-curvature relationship of fabrics. This model makes it possible to theoretically investigate the effects of fabric nonlinear bending behavior on measured bending prop erty values. The dependence of measured parameters (e.g., bending length, bending rigidity) on the conditions for the cantilever and heart loop, loop 3, and loop 4 tests is determined theoretically. Calculated results show good agreement with experimental observations reported in the literature for the cantilever and heart loop. An important discovery in this investigation is that the bending length values calculated and measured from loop 3 and loop 4 are not influenced by fabric sample length if that length is beyond a certain critical value.