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Chapter 15: Problem 2

In your own words, briefly describe the phenomenon of viscoelasticity.

Short Answer

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Answer: Viscoelasticity is a property of materials that exhibit both viscous and elastic characteristics during deformation. It combines the properties of an elastic, solid material, which can return to its original shape after the force is removed, with the flow behavior of a liquid, which doesn't return to its original shape when the force is removed. Viscoelastic materials exhibit a time-dependent deformation response when stress is applied, initially deforming rapidly like a viscous material and then slowly recovering their original shape like an elastic material. An example of a viscoelastic material is Silly Putty, which shows both elastic and viscous behaviors.

Step by step solution

01

Introduction to Viscoelasticity

Viscoelasticity is a property of materials that exhibit both viscous and elastic characteristics when undergoing deformation. It combines the properties of an elastic, solid material with the flow behavior of a liquid, which results in a time-dependent deformation response.
02

Elastic Behaviors

Elastic materials can undergo stress and strain deformation and return to their original shape after the force is removed. For example, imagine stretching a rubber band. The rubber band will return to its original shape when you let go of it. This property allows the material to store potential energy when deformed.
03

Viscous Behaviors

Viscous materials, on the other hand, dissipate energy during deformation and do not return to their original shape once the force is removed. Think of liquids, like honey, which flows under the influence of a force and does not return to its original shape when the force is removed.
04

Combining Elastic and Viscous Properties

Viscoelastic materials exhibit a combination of both elastic and viscous behaviors. When stress is applied, these materials experience a time-dependent deformation response. Initially, the material deforms rapidly like a viscous material but then becomes more like an elastic material over time, slowly recovering its original shape.
05

Example of Viscoelasticity

A common example of a viscoelastic material is Silly Putty. When Silly Putty is left to rest, it flows slowly but behaves like an elastic material under quick stress (such as bouncing). This behavior is a result of the material's viscoelastic properties which combine the characteristics of both elastic and viscous materials.

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