Problem

On the basis of the curves in Figure 15.5, sketch schematic strain–time plots for the foll...

On the basis of the curves in Figure 15.5, sketch schematic strain–time plots for the following polystyrene materials at the specified temperatures:

(a) Crystalline at 70°C

(b) Amorphous at 180°C

(c) Crosslinked at 180°C

(d) Amorphous at 100°C

Figure 15.5 (a) Load versus time, where load is applied instantaneously at time ta and released at tr. For the load–time cycle in (a), the strain-versus-time responses are for totally elastic (b), viscoelastic (c), and viscous (d) behaviors.

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