Properties and Behavior of Elastomers

Elastomers are materials that can be stretched to a large strain and return to their original shape. Rubber and the elastic tissue of the aorta are examples. These materials lack a well-defined plastic limit and break when the elastic limit is exceeded. They do not follow Hooke's Law, and their stress-strain relationship is non-linear. Young's modulus is small, allowing for a large range of elastic extension.

What is a key characteristic of elastomers?

• They are rigid and cannot be stretched.

• They have a high plastic limit.

• They do not return to their original shape after stretching.

• They can be stretched elastically to a large strain.

Which of the following is an example of an elastomer?

• Glass

• Rubber

• Wood

• Steel

What is the behavior of elastomers when the force is removed after stretching?

• They shrink beyond their original length.

• They return to their original length.

• They remain stretched.

• They become brittle.

What happens to rubber when it is stretched beyond its elastic limit?

• It becomes a liquid.

• It changes color.

• It breaks.

• It becomes more elastic.

How does Young's modulus of elastomers compare to other materials?

• It is very high.

• It is moderate.

• It is small.

• It is undefined.

Do elastomers obey Hooke's Law?

• No, they do not.

• Yes, they do.

• Only at high temperatures.

• Only when stretched slowly.

Which blood vessel is mentioned as an example of an elastomer?

• Vein

• Capillary

• Aorta

• Artery

What does the stress-strain graph of an elastomer look like?

• Non-linear

• Exponential

• Parabolic

• Linear

What is a common property of all elastomers?

• They are brittle and break easily.

• They are highly conductive.

• They can be stretched to a large extent and return to their original shape.

• They have a well-defined plastic region.