Frictional Properties

Abstract

:The surface roughness of polyester crepe fabrics in both the grey and finished states was evaluated sub jectively and objectively. Twenty female subjects assessed the surface of fabrics for their degree of "knobbiness", "roughness" and "softness" . The subjects evaluated the finished fabrics as being more "knobby" and "rough" than the grey fabrics. Measurements were made of the pressure between the fabric surface and the subject's hand dur ing these assessments. An increase in pressure tends to produce stronger "knobbiness" and" roughness" evalua tions. The coefficients of friction were measured between the skin and the fabrics under a pressure of 490 Pa. A power spectrum was obtalned from coefficients of friction by Fast Fourier Transform (FFT) and the results de scribed the stick-slip mechanism through which friction occurred between the assessor's skin and the fabric. This stick-slip phenomenon was shown to influence the assessment of the degree of "knobbiness". (Received 1993)