The development of the deformation r with time in a Maxwell model (when a constant stress is applied and later removed) is shown in Figure 4-11. Here the figure shows, at time t a certain stress Se is applied on the system, causing an immediate deformation mu of the solid (the spring in the model) in addition to a constant-rate deformation rzu representing the re sponse of the liquid the dash-pot in the model 2 can actually continue to increase, but the forces applied to the system are suddenly removed at