View source for Viscoelasticity



{{Continuum mechanics}}
'''Viscoelasticity''' is the property of materials that exhibit both [[Viscosity|viscous]] and [[Elasticity (physics)|elastic]] characteristics when undergoing [[Deformation|deformation]].  Viscous materials, like honey, resist [[shear flow]] and [[Strain (materials science)|strain]] linearly with time when a [[Stress (physics)|stress]] is applied. Elastic materials strain instantaneously when stretched and just as quickly return to their original state once the stress is removed. Viscoelastic materials have elements of both of these properties and, as such, exhibit time dependent strain. Whereas elasticity is usually the result of bond stretching along crystallographic planes in an ordered solid, viscoelasticity is the result of the diffusion of atoms or molecules inside of an [[amorphous]] material <ref name=Meyers>Meyers and Chawla (1999): "Mechanical Behavior of Materials," 98-103.</ref>. 

==Background==

In the nineteenth century, physicists such as [[James Clerk Maxwell|Maxwell]], [[Ludwig Boltzmann|Boltzmann]], and [[William Thomson, 1st Baron Kelvin|Kelvin]] researched and experimented with [[Creep (deformation)|creep]] and recovery of [[glass]]es, [[metal]]s, and [[rubber]]s <ref name=McCrum>McCrum, Buckley, and Bucknell (2003): "Principles of Polymer Engineering," 117-176.</ref>. Viscoelasticity was further examined in the late twentieth century when [[synthetic polymer]]s were engineered and used in a variety of applications <ref name=McCrum/>. Viscoelasticity calculations depend heavily on the [[viscosity]] variable, η. The inverse of η is also known as [[fluidity]], φ.  The value of either can be derived as a [[Temperature dependence of liquid viscosity|function of temperature]] or as a given value (ie for a [[dashpot]]) <ref name=Meyers/>. 
[[Image:Non-Newtonian fluid.PNG|frame|right|Different types of responses (<math>\sigma</math>) to a change in strain rate (d<math>\varepsilon</math>/dt)]]

Depending on the change of strain rate versus stress inside a material the viscosity can be categorized as having a linear, non-linear, or plastic response.  When a material exhibits a linear response it is categorized as a [[Newtonian material]] <ref name=Meyers/>.  In this case the stress is linearly proportional to the strain rate.  If the material exhibits a non-linear response to the strain rate, it is categorized as [[Non-Newtonian fluid]]. There is also an interesting case where the viscosity decreases as the shear/strain rate remains constant. A material which exhibits this type of behavior is known as [[Thixotropy|thixotropic]] <ref name=Meyers/>. In addition, when the stress is independent of this strain rate, the material exhibits plastic deformation <ref name=Meyers/>. Many viscoelastic materials exhibit [[rubber]] like behavior explained by the [[thermodynamic theory of polymer elasticity]]. 
In reality all materials deviate from Hooke's law in various ways, for example by exhibiting viscous-like as well as elastic characteristics. Viscoelastic materials are those for which the relationship between stress and strain depends on time. Anelastic solids represent a subset of viscoelastic materials: they have a unique equilibrium configuration and ultimately recover fully after removal of a transient load. 

Some phenomena in viscoelastic materials are: (i) if the stress is held constant, the strain increases with time (creep); (ii) if the strain is held constant, the stress decreases with time (relaxation); (iii) the effective stiffness depends on the rate of application of the load; (iv) if cyclic loading is applied, hysteresis (a phase lag) occurs, leading to a dissipation of mechanical energy; (v) acoustic waves experience attenuation; (vi) rebound of an object following an impact is less than 100%; (vii) during rolling, frictional resistance occurs. 

All materials exhibit some viscoelastic response. In common metals such as steel or aluminum, as well as in quartz, at room temperature and at small strain, the behavior does not deviate much from linear elasticity. Synthetic polymers, wood, and human tissue as well as metals at high temperature display significant viscoelastic effects. In some applications, even a small viscoelastic response can be significant. To be complete, an analysis or design involving such materials must incorporate their viscoelastic behavior. 
Knowledge of the viscoelastic response of a material is based on measurement


Some examples of viscoelastic materials include amorphous polymers, semicrystalline polymers, biopolymers, metals at very high temperatures, and bitumen materials. Cracking occurs when the strain is applied quickly and outside of the elastic limit.

A '''viscoelastic''' material has the following properties:
* [[hysteresis]] is seen in the [[stress-strain curve]].
* [[stress relaxation]] occurs: step constant strain causes decreasing stress
* [[creep (deformation)|creep]] occurs: step constant stress causes increasing strain

== Elastic behavior versus viscoelastic behavior ==

[[Image:Elastic_v._viscoelastic_2.JPG|frame|right|Stress-Strain Curves for a purely elastic material (a) and a viscoelastic material (b).  The red area is a [[hysteresis]] loop and shows the amount of energy lost (as heat) in a loading and unloading cycle.  It is equal to <math>\oint\sigma \, d \varepsilon </math>, where <math>\sigma</math> is stress and <math>\varepsilon</math> is strain.  <ref name=Meyers/>]]

Unlike purely elastic substances, a viscoelastic substance has an elastic component and a viscous component.  The [[viscosity]] of a viscoelastic substance gives the substance a strain rate dependent on time<ref name=Meyers/>.  Purely elastic materials do not dissipate energy (heat) when a load is applied, then removed<ref name=Meyers/>.  However, a viscoelastic substance loses energy when a load is applied, then removed. [[Hysteresis]] is observed in the stress-strain curve, with the area of the loop being equal to the energy lost during the loading cycle<ref name=Meyers/>.  Since viscosity is the resistance to thermally activated plastic deformation, a viscous material will lose energy through a loading cycle.  Plastic deformation results in lost energy, which is uncharacteristic of a purely elastic material's reaction to a loading cycle<ref name=Meyers/>.

Specifically, viscoelasticity is a molecular rearrangement.  When a stress is applied to a viscoelastic material such as a [[polymer]], parts of the long polymer chain change position.  This movement or rearrangement is called [[Creep (deformation)|Creep]].  Polymers remain a solid material even when these parts of their chains are rearranging in order to accompany the stress, and as this occurs, it creates a back stress in the material.  When the back stress is the same magnitude as the applied stress, the material no longer creeps.  When the original stress is taken away, the accumulated back stresses will cause the polymer to return to its original form.  The material creeps, which gives the prefix visco-, and the material fully recovers, which gives the suffix -elasticity<ref name=McCrum/>.

== Types of viscoelasticity ==

'''Linear viscoelasticity''' is when the function is [[separable ordinary differential equation|separable]] in both creep response and load. All linear viscoelastic models can be represented by a [[integral equation|Volterra equation]] connecting [[stress (physics)|stress]] and [[Strain (materials science)|strain]]:
:<math>\epsilon(t)= \frac { \sigma(t) }{ E_\text{inst,creep} }+ \int_0^t K(t-t^\prime) \dot{\sigma}(t^\prime) d t^\prime</math>
or
:<math>\sigma(t)= E_\text{inst,relax}\epsilon(t)+ \int_0^t F(t-t^\prime) \dot{\epsilon}(t^\prime) d t^\prime</math>
where 
* ''t'' is [[time]]
* ''<math>\sigma (t)</math>'' is [[stress (physics)|stress]]
* ''<math>\epsilon (t)</math>'' is strain
* ''<math>E_\text{inst,creep}</math>'' and ''<math>E_\text{inst,relax}</math>'' are instantaneous [[Young's modulus|elastic moduli]] for creep and relaxation
* ''K(t)'' is the [[creep (deformation)|creep]] function 
* ''F(t)'' is the relaxation function

Linear viscoelasticity is usually applicable only for small [[deformation]]s.

'''Nonlinear viscoelasticity''' is when the function is not separable. It is usually happens when the [[deformation]]s are large or if the material changes its properties under deformations.

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.

== Dynamic modulus ==
{{main|Dynamic modulus}}

Viscoelasticity is studied using [[dynamic mechanical analysis]]. When we apply a small oscillatory strain and measure the resulting stress.
*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 lag. 
*Viscoelastic materials exhibit behavior somewhere in the middle of these two types of material, exhibiting some lag in strain.

Complex [[Dynamic modulus]] G can be used to represent the relations between the oscillating stress and strain:
:<math>G = G' + iG''</math> 
where i = <math>sqrt(-1)</math>; <math>G'</math> is the ''storage modulus'' and <math>G''</math> is the ''loss modulus'':
:<math> G' = \frac {\sigma_0} {\varepsilon_0} \cos \delta </math> 
:<math> G'' =  \frac {\sigma_0} {\varepsilon_0} \sin \delta </math>
where <math>\sigma_0</math> and <math>\varepsilon_0</math> are the amplitudes of stress and strain and <math>\delta</math> is the phase shift between them.

== Constitutive models of linear viscoelasticity ==

Viscoelastic materials, such as amorphous polymers, semicrystalline polymers, and biopolymers, can be modeled in order to determine their stress or strain interactions as well as their temporal dependencies.  These models, which include the [[Maxwell material|Maxwell model]], the [[Kelvin-Voigt material|Kelvin-Voigt model]], and the [[Standard Linear Solid Model]], are used to predict a material's response under different loading conditions.  Viscoelastic behavior is comprised of elastic and viscous components modeled as linear combinations of [[spring (device)|springs]] and [[dashpots]], respectively.  Each model differs in the arrangement of these elements, and all of these viscoelastic models can be equivalently modeled as electrical circuits. In an equivalent electrical circuit, stress is represented by voltage, and the derivative of strain (velocity) by current. The elastic modulus of a spring is analogous to a circuit's ''capacitance'' (it stores energy) and the viscosity of a dashpot to a circuit's ''resistance'' (it dissipates energy). 

The elastic components, as previously mentioned, can be modeled as [[spring (device)|springs]] of elastic constant E, given the formula:
:<math>\sigma = E \varepsilon</math>
where σ is the stress, E is the elastic modulus of the material, and ε is the strain that occurs under the given stress, similar to [[Hooke's Law]]. 

The viscous components can be modeled as [[dashpots]] such that the stress-strain rate relationship can be given as,
:<math>\sigma = \eta \frac{d\varepsilon}{dt}</math>
where σ is the stress, η is the viscosity of the material, and dε/dt is the time derivative of strain. 

The relationship between stress and strain can be simplified for specific stress rates. For high stress states/short time periods, the time derivative components of the stress-strain relationship dominate. A dashpots resists changes in length, and in a high stress state it can be approximated as a rigid rod. Since a rigid rod cannot be stretched past its original length,  no strain is added to the system<ref name=VanVliet>Van Vliet, Krystyn J. (2006); "3.032 Mechanical Behavior of Materials", [http://stellar.mit.edu/S/course/3/fa06/3.032/index.html]</ref>

Conversely, for low stress states/longer time periods, the time derivative components are negligible and the dashpot can be effectively removed from the system - an "open" circuit. As a result, only the spring connected in parallel to the dashpot will contribute to the total strain in the system<ref name=VanVliet/>

===Maxwell model===
{{main|Maxwell material}}

[[Image:Maxwell diagram.svg|right|thumb|200px|Maxwell model]]
The Maxwell model can be represented by a purely viscous damper and a purely elastic spring connected in series, as shown in the diagram. The model can be represented by the following equation:

:<math>\frac {d\epsilon_{Total}} {dt} = \frac {d\epsilon_{D}} {dt} + \frac {d\epsilon_{S}} {dt} = \frac {\sigma} {\eta} + \frac {1} {E} \frac {d\sigma} {dt}</math>.

The model represents a liquid (able to have irreversible deformations) with some additional reversible (elastic) deformations. If put under a constant strain, the stresses gradually [[Relaxation time|relax]]. When a material is put under a constant stress, the strain has two components as per the Maxwell Model. First, an elastic component occurs instantaneously, corresponding to the spring, and relaxes immediately upon release of the stress. The second is a viscous component that grows with time as long as the stress is applied. The Maxwell model predicts that stress decays exponentially with time, which is accurate for most polymers. It is important to note limitations of such a model, as it is unable to predict creep in materials based on a simple dashpot and spring connected in series.  The Maxwell model for creep or constant-stress conditions postulates that strain will increase linearly with time.  However, polymers for the most part show the strain rate to be decreasing with time<ref name=McCrum/>.

Application to soft solids:thermoplastic polymers in the vicinity of their melting temperature, fresh concrete ( neglecting its ageing), numerous metals at a temperature close to their melting point.

===Kelvin-Voigt model===
{{main|Kelvin-Voigt material}}
[[Image:Kelvin Voigt diagram.svg|right|thumb|120px|Schematic representation of Kelvin-Voigt model.]]

The Kelvin-Voigt model, also known as the Voigt model, consists of a Newtonian damper and Hookean elastic spring connected in parallel, as shown in the picture.  It is used to explain the stress relaxation behaviors of polymers.

The constitutive relation is expressed as a linear first-order differential equation:

:<math>\sigma (t) = E \epsilon(t) + \eta \frac {d\epsilon(t)} {dt}</math>

This model represents a solid undergoing reversible, viscoelastic strain. Upon application of a constant stress, the material deforms at a decreasing rate, asymptotically approaching the steady-state strain. When the stress is released, the material gradually relaxes to its undeformed state.  At constant stress (creep), the Model is quite realistic as it predicts strain to tend to σ/E as time continues to infinity.  Similar to the Maxwell model, the Kelvin-Voigt Model also has limitations.  The model is extremely good with modelling creep in materials, but with regards to relaxation the model is much less accurate.
viscoelastic solids often exhibit the pehonmenon ageing

Applications : organic polymers, rubber, wood when the load is not too high.

=== Standard Linear Solid Model ===
{{main|Standard Linear Solid Model}}
[[Image:SLS.svg|right|thumb|200px|Schematic representation of the Standard Linear Solid model.]]

The Standard Linear Solid Model effectively combines the Maxwell Model and a Hookean spring in parallel.  A viscous material is modeled as a spring and a dashpot in series with each other, both of which are in parallel with a lone spring. For this model, the governing constitutive relation is:
:<math> \frac {d\varepsilon} {dt} =  \frac { \frac {E_2} {\eta} \left ( \frac {\eta} {E_2}\frac {d\sigma} {dt} + \sigma  - E_1 \varepsilon \right )} {E_1 + E_2}</math>
Under a constant stress, the modeled material will instantaneously deform to some strain, which is the elastic portion of the strain, and after that it will continue to deform and asymptotically approach a steady-state strain. This last portion is the viscous part of the strain. Although the Standard Linear Solid Model is more accurate than the Maxwell and Kelvin-Voigt models in predicting material responses, mathematically it returns inaccurate results for strain under specific loading conditions and is rather difficult to calculate.

=== Generalized Maxwell Model ===
{{main|Generalized Maxwell Model}}
[[Image:Weichert.svg|right|thumb|300px|Schematic of Maxwell-Weichert Model]]
The Generalized Maxwell also known as the Maxwell-Weichert model (after [[James Clerk Maxwell]] and [[Dieter Weichert]]) is the most general form of the models described above. It takes into account that relaxation does not occur at a single time, but at a distribution of times.  Due to molecular segments of different lengths with shorter ones contributing less than longer ones, there is a varying time distribution.  The Weichert model shows this by having as many spring-dashpot Maxwell elements as are necessary to accurately represent the distribution.  The Figure on the right represents a possible Weichert model <ref name=Roylance>Roylance, David (2001); "Engineering Viscoelasticity", 14-15</ref>.
Applications : metals and alloys at temperatures lower than one quarter of their absolute melting temperature (expressed in K).

==Effect of temperature on viscoelastic behavior==

The secondary bonds of a polymer constantly break and reform due to thermal motion.  Application of a stress favors some conformations over others, so the molecules of the polymer will gradually "flow" into the favored conformations over time.  Because thermal motion is one factor contributing to the deformation of polymers, viscoelastic properties change with increasing or decreasing temperature.  In most cases, the creep modulus, defined as the ratio of applied stress to the time-dependent strain, decreases with increasing temperature.  Generally speaking, an increase in temperature correlates to a logarithmic decrease in the time required to impart equal strain under a constant stress. In other words, it takes less energy to stretch a viscoelastic material an equal distance at a higher temperature than it does at a lower temperature.

==Viscoelastic creep==
{{main|Creep (deformation)}}

[[Image:Creep2.JPG|right|thumb|300px|Applied stress (a) and induced strain (b) as functions of time for a viscoelastic material.]]

When subjected to a step constant stress, viscoelastic materials experience a time-dependent increase in strain.  This phenomenon is known as viscoelastic creep.

At a time t0, a viscoelastic material is loaded with a constant stress that is maintained for a sufficiently long time period.  The material responds to the stress with a strain that increases until the material ultimately fails.  When the stress is maintained for a shorter time period, the material undergoes an initial strain until a time t1, after which the strain immediately decreases (discontinuity) then gradually decreases at times t > t1 to a residual strain.

Viscoelastic creep data can be presented by plotting the creep modulus (constant applied stress divided by total strain at a particular time) as a function of time <ref name=Rosato>Rosato, et. al (2001): "Plastics Design Handbook," 63-64.</ref>.  Below its critical stress, the viscoelastic creep modulus is independent of stress applied.  A family of curves describing strain versus time response to various applied stress may be represented by a single viscoelastic creep modulus versus time curve if the applied stresses are below the material's critical stress value.

Viscoelastic creep is important when considering long-term structural design.  Given loading and temperature conditions, designers can choose materials that best suit component lifetimes.

== Measuring viscoelasticity ==

Though there are many instruments that test the mechanical and viscoelastic response of materials, [[broadband viscoelastic spectroscopy]] (BVS) and [[resonant ultrasound specstroscopy]] (RUS) are more commonly used to test viscoelastic behavior because they can be used above and below ambient temperatures and are more specific to testing viscoelasticity. These two instruments employ a damping mechanism at various frequencies and time ranges with no appeal to time-temperature superposition <ref name=Lakes>Rod Lakes (1998): ''Viscoelastic solids'', CRC Press.</ref>. Using BVS and RUS to study the mechanical properties of materials is important to understanding how a material exhibiting viscoelasticity will perform <ref name=Lakes/>.

== See also ==
*[[Viscoplasticity]]
*[[Bingham plastic]]
*[[Polymer]]
*[[Creep (deformation)|Creep]]
*[[Stress relaxation]]
*[[Hysteresis]]
*[[Biomaterial]]
*[[Biomechanics]]
*[[Rubber Elasticity]]
*[[Fractional calculus]]
*[[Rheology]]

== References ==
<references/>
* Silbey and Alberty (2001): ''Physical Chemistry'', 857. John Wiley & Sons, Inc.
* Allen and Thomas (1999): "The Structure of Materials," 51.
* Crandal et al. (1999): "An Introduction to the Mechanics of Solids" 348
* J.Lemaitre and J.L. Chaboche (1994)" Mechanics of solid materials"


[[Category:Materials science]]
[[Category:Non-Newtonian fluids]]
[[Category:Continuum mechanics]]
[[Category:Rubber properties]]

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