In this paper, the main emphasis and focus will be to study and illuminate the nature of Plastic Energy Dissipation (PED) in a variety of polymers and relate it to the relevant polymer solid state material properties. This PED term represents the heat generated during deforming a polymer solid. Polymer solids are viscoelastic and their viscous nature generates heat. A series of experiments for various polymers have been conducted in 'direct measurement method' and 'indirect evaluation method'. The experimental evidence to relate the stress relaxation and the sensible temperature rise were revealed by the series of direct method experiments. A number of PED experiments were conducted as functions of strain rate, strain and temp erature and the iso-temperature rise plots were obtained in temperature-strain space for commercial amorphous and semicrystalline polymers.
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