Large-Scale Extension and Recovery of Plain Woven Fabrics

Abstract

To confirm the value of the theoretical analyses presented in Part I, a number of specially woven fabrics have been tested. The agreement between experiment and theory is sometimes reasonable, but it is better during extension than during recovery. The reasons for such discrepancies are discussed. The outcome of this study implies that medium to high curvature yarn bending, which is inherent in a fabric's large- strain tensile behavior, should be taken into consideration. Fibers in a yarn are strained beyond their yield limits due to the high curvatures imposed, and as a result, the recovery from such large strains is principally governed by fiber hysteresis rather than the interfiber frictional restraint mechanism. This necessitates the modification of yarn bending behavior. An attempt is made to propose a modified yarn bending rule by taking account of initial nonlinear bending due to interfiber frictional restraint and of a fiber-yielding mechanism at high curvature.