viscoelasticity

Viscoelasticity is a material property that combines both viscous and elastic characteristics. Many materials have such viscoelastic properties, especially materials that consist of large molecules. Polymers are viscoelastic because their macromolecules can make temporary entanglements with neighbouring molecules which causes elastic properties. After some time these entanglements will disappear again and the macromolecules will flow into other positions where new entanglements will be made (viscous properties).

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Commons category: Viscoelasticity

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25 sections

Contents

Background
Elastic versus viscoelastic behavior
Linear viscoelasticity and nonlinear viscoelasticity
Dynamic modulus
Constitutive models of linear viscoelasticity
Maxwell model
Kelvin–Voigt model
Standard linear solid model
Jeffreys model
Burgers model
Generalized Maxwell model
Constitutive models for nonlinear viscoelasticity
Second-order fluid
Upper-convected Maxwell model
Oldroyd-B model
Wagner model
Prony series
Effect of temperature
Viscoelastic creep
Measurement
Shear rheometry
Extensional rheometry
Other methods
See also
References

A viscoelastic material will show elastic properties on short time scales and viscous properties on long time scales. These materials exhibit behavior that depends on the time and rate of applied forces, allowing them to both store and dissipate energy.