More specifically, the curves obtained at low elongational rate show an increasing trend as a function of time, up to a plateau; in these conditions, the material is in the linear range of deformation and the time-dependent elongational viscosity is three times higher than the time-dependent Newtonian shear viscosity.
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Effect of the Elongational Flow on the Morphology and Properties of Polymer Systems: A Brief Review.
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The sentences
The incorporation of 10 wt.% of LDPE into the linear polymer induced the appearance of a distinct strain hardening only at high elongational rates; although this behavior was not detected at low rates, the elongational viscosity values did not show a decreasing trend, suggesting the material uniformity during deformation.