Stress Relaxation after Large Sudden Strains

Stress Relaxation after Large Sudden Strains 

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Stress Relaxation after Large Sudden Strains... 

In addition to the normal stress differences and manifestations of non-Newtonian flow mentioned above, all the viscoelastic experiments described in Section C above (stress relaxation after sudden strain, stress relaxation after cessation of steady flow, creep, creep recovery, behavior in oscillating deformations, etc.) become much more complicated when deformations are large. A few examples will be shown in Chapter 2 and others in Chapters 13 and 17. 

This section treats the time evolution of the stress after a sudden deformation is given to an equilibrium state of the network. The deformation, being followed by a constant strain, creates a stress which gradually relaxes with time. The long-term behavior of stress relaxation following a large stepwise deformation is frequently measured in rheological experiments. It is known as the nonlinear stress relaxation. 

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