Читать книгу The Rheology Handbook - Thomas Mezger - Страница 100

In order to illustrate plastic behavior: Not all flowing layers in the Two-Plates model are shifting along one another to the same extent. Therefore across the shear gap, the resulting shear rate (or “velocity gradient“) and shear deformation (or deflection gradient),respectively, are not constant. Only some layers are in motion and others remain still at rest. After removing the load, any re- formation of the layers depends on the elastic portion. Related to the entire gap this re-formation is also inhomogeneously. In comparison to this, Figures 2.1, 2.9 (no.2) and 4.1 exhibit the behavior desired by rheologists at homogeneous deformation and flow conditions.