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Viscoelasticity is studied using [[dynamic mechanical analysis]], applying a small oscillatory stress and measuring the resulting strain.
* Purely elastic materials have stress and strain in phase, so that the response of one caused by the other is immediate.
* In purely viscous materials, strain lags stress by a 90 degree phase.
* Viscoelastic materials exhibit behavior somewhere in the middle of these two types of material, exhibiting some lag in strain.
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