Resilience-temperature curves

Figure 5. Resilience-temperature curves for the blends of polymer B with the styrenic interpolymers...

It has been shown [56] that if we measure the areas under the approach and retract curves of the force-distance plot we can get quantitative values of the resilience. Resilience is closely related to the ability of the polymer chain to rotate freely, and thus will be affected by rate and extent of deformation, as well as temperature. Different materials will respond differently to changes in these variables [46] hence, changing the conditions of testing will result in a change in absolute values of resilience and may even result in a change in ranking of the materials. Compared to more traditional methods of resilience measurement such as the rebound resiliometer or a tensUe/compression tester. 

Also, the AUC (area under curve) of the different materials represents their resilience. Cast iron and ceramics are very brittle steel, copper, and aluminum, as well as the thermoplastics PA and PP, are highly deformable and can therefore absorb large amounts of energy, for example from (impact) load application. It must be remembered here that the deformation behavior of plastics is highly dependent on time and temperature factors (see Fig. 15). Simplified explanations of deformation terminology follow. 

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