The differences in frictional forces acting between fabrics woven from filament yarns are dependent on the morphology of the fabrics and the rubbing direction. When one fabric is moved across a second stationary fabric and the projecting yarn waves of one of the fabrics is rubbed perpendicular to the yarn axes orientation, the Howell's characteristics of frictional resistance for the fabric and yarn have similar values.
A method for predicting yarn strength and strain is presented, based on the main fiber parameters of linear density, length, strain, and stress. The application of special software for a microcomputer makes the time required for all the calculations extremely short (2 minutes maximum). A comparison of the theoretical and experimental values of strength and breaking strain is presented.
A new rheological model is presented that describes the compressional behavior of non woven fabrics. In this model, a nonwoven is considered an elastic/viscoplastic material called a Bingham material. To reflect the plastic deformation, the Saint-Venant element of the specific characteristic is introduced. This element reflects the dissipation of energy due to the friction, which depends on the level of reconstruction of the structure of the nonwoven material under compression. The model is verified experimentally with nineteen different nonwovens. A comparative analysis of the compression curves determined theoretically and experimen tally indicates a high level of correlation between both data sets.
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