# viscoelasticity

## FE routine for Viscoelasticity

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Hi,

Does anyone have a small strain FE viscoelasticity routine or code that I can use, prefreably in Fortran? Thanks.

Shriram

## viscoelastic analysis

HI!

I applied constant load on the viscoelastic body.

Now i want to see the displacement of one of the node with respect to time.

Can any body help me in this regard?

thank you.

## Maxwell viscoelastic model in ABAQUS

Hi Guys,

I have the shear relaxation modulus given as: G(t)=Go*EXP(-t/tau). In ABAQUS, the normalized shear modulus for one term in Prony series is given as: g(t)=Go(1-g1(1-EXP(-t/tau)). The parameters that must be entered in ABAQUS are g1 and tau. For Maxwell (in our case) G(t=infinity)=0.

Consequently, g1=1-G(t=infinity)/Go=1. ABAQUS requires that g1 must be less than 1. Has anyone encountered this problem?

thanks

Ah

## QLV in Abaqus

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How can I model QLV (Quasi Linear Viscoelasticity proposed by Fung) in Abaqus ?

If I have generate material vith viscoelastic (prony series) + hyperelastic properties, is this setup belongs to quasi-linear viscoelasticity ?

If so, How can I model linear viscoelasticity?

## Quasi Linear Viscoelasticity vs. Linear Viscoelasticity

Can anyone explain what is main difference between Linear Viscoelasticity vs qlv (Quasi linear Viscoelasticity) proposed by Fung.  As far as I understand stress relaxation function and elastic response functions separated and given in convolution form which provides "strain rate independent" results in qlv application.

Is linear viscoelastic description is strain dependent?

## abaqus viscoelastic example

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Hi, has anyone tried the bushing example from abaqus' problems manual? The full name of the section is: transient loading of a viscoelastic bushing. The job is aborted due to some unknown set. Thanks.

## Fracture Simulation Using Discrete Lattice Models

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I am trying to implement quasi static fracture in a discrete lattice model, with material being viscoelastic. Do i need to use an incremental-iterative method? Please give your suggestions.

## Viscoelastic (generalized maxwell) model in MSC.Marc or ABAQUS

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Greetings all,

I am trying to use gerenalized maxwell viscoelastic model for polyimide polymer films (Kapton) in MSC Marc (or ABAQUS). I have never used the prony series representation of the maxwell model (hereditary integral approach). Has anyone ever used MSC Marc to incorporate the prony series relaxation to the material? or ABAQUS? Here is my game plan for doing this:

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## ABAQUS ( viscoelastic material model)

Does any one know how to implement other viscoelastic material models, like Burgers' model, in ABAQUS? To my knowledge only Prony series can be used to model visoelastic materials in ABAQUS/standard.

thanks,

Milliyon