The Importance of Interfiber Friction in Wrinkling

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Abstract
Some of the more important consequences of interfiber friction in fabric wrinkling are discussed. A simple approxi mate relation for a linear viscoelastic fabric is obtained which relates the residual set at which the fabric ceases recovering to the length of time it was held bent before release. It is also shown how the presence of friction can allow quite high residual deformations to build up following series of short wrinkle-and-recovery cycles. For a typical single wrinkle-and-recovery cycle the frictional moment interacts with the viscoelastic behavior of the single fibers to impose a limit on the final recovery that a fabric may eventually attain. This concept is interpreted in terms of previously defined parameters V and F obtained from a standard test procedure. The importance of evressing the wrinkling behavior of a fabric in terms of its viscoelastic and frictional components is emphasized.