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Line 44: Linear viscoelasticity is usually applicable only for small [[deformation (engineering)\|deformation]]s. '''Nonlinear viscoelasticity''' is when the function is not separable. It usually happens when the [[deformation (engineering)\|deformation]]s are large or if the material changes its properties under deformations. Nonlinear viscoelasticity also elucidates observed phenomena such as normal stresses, shear thinning, and extensional thickening in viscoelastic fluids.<ref name="Macosko 1994">{{Cite book\|last=Macosko\|first=Christopher W.~~\|url=https://www.worldcat.org/oclc/232602530~~\| title=Rheology : principles, measurements, and applications\|date=1994\|publisher=VCH\|isbn=978-1-60119-575-3\|___location=New York\| oclc=232602530}}</ref> An '''anelastic''' material is a special case of a viscoelastic material: an anelastic material will fully recover to its original state on the removal of load.

Viscoelasticity: Difference between revisions