Читать книгу The Rheology Handbook - Thomas Mezger - Страница 206

The spring recoils elastically, i. e. it moves back immediately and completely. The distance travelled by the dashpot, however, remains unchanged.

As a result of the phase after removing the load, the γ(t)-function occurs as an immediate reformation step, i. e. a step which is independent of time. Afterwards, the γ-value remains unchanged on a constant value.

Figure 5.2: Simulation of the deformation behavior of viscoelastic liquids using the Maxwell model

Summary: Behavior of the Maxwell model

After a load-and-removal cycle, these kinds of samples remain partially deformed. The extent of the reformation represents the elastic portion, and the extent of the permanently remaining deformation corresponds to the viscous portion. There is an irreversible deformation process taking place since such a sample occurs in a changed shape at the end of the process because its reformation is not complete, even after a long period of time at rest. These kinds of materials behave essentially like a liquid, and therefore, they are referred to as viscoelastic liquids or Maxwell fluids.