Abstract
The stationary creep phenomena of the untwisted sliver subjected to various constant loads has been observed by one of the authors, previously.
In this paper, the theoretical relationship between external load and stationary creep velocity is derived assuming that the slippage of individual fiber in assembly may occur when the fiber tension increases to reach the value larger than the static frictional force.
The increment of this tension is determined by the pulling rate of force.
The complete expression for the stationary creep velocity becomes where, W=external load, P=inter-fiber pressure per unit length, N=number of fibers in cross section, l=length of fiber, E=Young's modulus of fiber, A=area of cross-section of fiber, μ0=coefficient of static friction, μk=coefficient of kinetic friction, and α=constant determined by the nature of contacting fibers.
A comparison of this theoretical expression with experiment was satisfactory in the range in which fiber number N remains constant for various loads.
