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Viscoelasticity describes materials that exhibit both viscous and elastic characteristics when undergoing deformation. This means they can both deform under stress and return to their original shape, but with a time-dependent component.12

For example, Silly Putty, when handled quickly, bounces like an elastic solid. However, if left to sit, it flows like a viscous fluid. This dual behavior is common in polymeric solids.32

The study of viscoelasticity is important for understanding how stress waves are attenuated and vibrations are damped. It's a key concept within the broader field of solid mechanics, which deals with the stress, deformation, and failure of materials.23

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