RESEARCHES ON VISCO-ELASTICITY OF METAL FILAMENT

Abstract

The effects of twist, temperature, and sizing on the tensile strength, dynamic Young's modulus, and tanδ of stainless streel filaments (12μ×300) made in U.S.A. were studied.
(a) The relations of the number of twists to the tensile strength and to dynamic Young's modulus of metal filaments were obtained as follows:
where, F: Strength (kg). N: Number of twist/5cm. E: Dynamic Young's Modulus. A, B, K, X, α: Constant.
In this case;
A=12kg, B=0.98, K=2.08×10⁴ X=0.8, α=0.025
(b) As to the effect of the number of twists and sizing on the tanδ, the value increases with the increasing number of twists, having its maximum value.
The polymers used for the sizing considerably affected the value of tanδ, as generally shown in the following equation.
where, G₁: Dynamic Young's modulus of polymer. G₂: Dynamic Young's modulus of metal filament. ω=2πf:Frequency. η₁: Viscosity coefficient of polymer.
The equation (4), which obtaines by substituting E=G₂=Ke-^_??_N into (3), shows the relation of tanδ to the number of twists and the characteristic of polymer and has the good agreement with the experimental results.