Variation of the frequency and amplitude of periodic deformation in a Weissenberg rheogoniometer

The stresses that develop in the material due to changes in the frequency or amplitude of periodic deformation in a Weissenberg rheogoniometer are described. Examples of stress buildup and relaxation are presented for a filled low-density polyethylene melt.Institute of Polymer Mechanics, Academy of Sciences of the Latvian SSR, Riga. Translated from Mekhanika Polimerov, No. 5, pp. 936–938, September–October, 1970.