Abstract
We measured the creep of polyvinyl chloride fibers at 20°C and 40°C, and constructed the master creep curves by basing the key to the procedure for generalization upon O'Shughnessy's assumption that there exist an invariant pattern in logarithmic time for the entire delayed elongation process but that the time scale of the response, as well as its magnitude is dependent on stress.
The characteristic retardation times, Log τ, plotted as function of stresses, decreased linearly as stresses increased. The instantaneous elastic elongation E0, plotted as function of stresses, increased linearly where stresses (S) were relatively small, but these relations between E0 and S deviate from linear relations where stresses were relatively large and these deviations suggested the structural change in PVC fibers. The reciprocals of scale factors, 1/f, plotted as function of stresses well indicate the stress dependence of retarded elastic deformation of PVC fibers.
