繊維材料における固体粘性係数の周波数依存性について-3-

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The longitudinal vibration properties of several textile fibera (viscose rayon, bemberg rayon, acetate rayon, raw silk, degummed silk, and amilan-polycapramide fiber) were measured by means of the free damping oscillation meathod over sub-sonic range and of the forced vibration method over lower audio frequency range at 20°C, 65% R. H., under static tension of about 0.4 g/den., and within dynamic strain of 0.1%.<BR>The vibration properties of any textile fiber at a given angular frequency could be approximated by a single Voigt element, but this simple mechanical model was not available for the universal representation of the properties under various angular frequency. Therefore, the rc suits wire described by two apparent parameters, the tensile modulus of elasticity, E, and the normal viscosity coefficient, ξ, of this simple mechanical model as a function of applied angular frepuency.<BR>Generally speaking of any fibers, the tensile modulus of elasticity has been expected to be flat over this frequency range, but, on the contrary, the normal viscosity coefficient decreased remarkably with increasing frequency. The logarithm of the normal viscosity coefficient bears a straightline relationship to that of frequency. This straight line inclined about 45 degrees against frequency axis, but, for regenerated cellulose fibers, the inclination seemed to be somewhat greater than 45 degrees especially over a range of sub-sonic frequency.
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繊維材料における固体粘性係数の周波数依存性について-3-

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