ABSTRACT
The energy loss which occurs during cyclic deformation of fabrics is due to two separate causes. The first is the well-known non-Hookean behavior of the fibers themselves, while the second is in some way related to the structure of the fabric. The basic physical mechanisms for these two causes of hysteresis are rather different; the first is the result of plasticity and creep effects in the fiber, while the second is due to frictional restraint to interfiber and interyarn movements in the fabric during deformation The frictional energy is the sum of the products of the relative movement between either yarns or fibers, the force acting between them and the coefficient of friction at each contact point where relative movement occurs. The relative effect of frictional restraint to bending compared with fiber plasticity and creep on the wrinkle and crease resistance of fabrics depends on the relative severity of the creasing or wrinkling action.
