Explain what is meant by a viscoelastic material, and relate its ...

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Explain what is meant by a viscoelastic material, and relate its response to applied stresses by comparing the material with an elastic solid and a viscous fluid.
 
  What will be an ideal response?

Question 2

Why does processing of a crystalline material like nylon require more critical thermal control as opposed to an amorphous material like ABS?
 
  What will be an ideal response?

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Answer to Question 1

Viscoelastic materials have some properties that are similar to elastic solids and some properties that are similar to viscous fluids. When a stress is applied to a viscoelastic material that is a solid, the solid will deform much like an elastic solid but will not immediately recover its original shape when the stress is removed. The viscoelastic material has used up some of the applied stress through internal heating, hence, not all of the energy is available to assist in the shape recovery.

Answer to Question 2

Nylon, like all crystalline materials, has a sharp melting point. Processing below this temperature is virtually impossible. Processing much above this temperature can make the melt excessively runny (low viscosity). Amorphous materials

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