Question
What is an elastomer? What are their special features?

Answer

Elastomers: Elastomer are those substances which can be stretched to cause large strains. Substances like tissue of aorta, rubber etc., are elastomers.
The stress-strain curve for an elastomer is as shown in figure below.

Although elastic region is very large but the material does not obey Hooke's law over most of the region. Moreover, there is no well defined plastic region.

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