抄録
The resonance frequency method has not successfully been applied for the determination of the bending Young's modulus E of a single filament of commercial viscose rayon. This is because that the cross sectional shape of the viscose filament is irregular and the observed data are highly dispersed. So the present authors devised to rotate the clamp attached with a test filament and to vibrate the filament in the four different directions, prependicular to each other in a plane. The corresponding four resonance frequencies read on each filament differ remarkably from each other, so the arithmetic mean of the maximum and minimum values among them is taken to calculate E. This reduces intensively the effect of the cross-sectional irregularity and shows very good results. The ratio of the standard deviation to the average of E is only 0.03_??_0.04, contrary to 0.3-0.4 of the corresponding values in the ordinary calculation, providing the denier of the filament is uniform. The reason is discussed.
