User login

You are here

viscoelasticity

Wei Hong's picture

Modeling Viscoelastic Dielectrics

Dielectric elastomer, as an important category of electroactive polymers, is known to have viscoelastic properties that strongly affect its dynamic performance and limit its application. Very few models accounting for the effects of both electrostatics and viscoelasticity exist in the literature, and even fewer are capable of making reliable predictions under general loads and constraints. Based on the principals of nonequilibrium thermodynamics, this paper develops a field theory that fully couples the large inelastic deformations and electric fields in deformable dielectrics.

FE routine for Viscoelasticity

Choose a channel featured in the header of iMechanica: 

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

Free Tags: 

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

Choose a channel featured in the header of iMechanica: 
Free Tags: 

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.

Internship available in FEA of elastomers

Internship Announcement  

Title : FEA of Elastomers

Category: Internship in Industry

Employer: Schlumberger Technology Corporation

Location: Sugar Land, TX, USA

Viscoelasticity in Abaqus

Hi All,

 I would like to use Abaqus to model the viscoelastic material  behaviour of a polymer.


I have material data from a simple uniaxial creep experiment (nominal strain vs time).  I tried to use the viscoelastic material model in Abaqus.  I am a bit confused as to how I need to enter my data (what format). 

The manual says I have to specify the normalized bulk and normalized shear compliance

cbrinson's picture

New Book on Polymers and Viscoelasticity

I wish to inform the imechanica community about my recent book,  Polymer Engineering Science and Viscoelasticity, Springer, 2008. THe book starts at the beginning and contains both the physics of polymers and the mathematics of viscoelasticity. It is also unique in the history of mechanics in being the (first ever?) father-daughter book. Those interested in polymer mechanics may find this a useful resource! It may be found in your library or further information can be found here

Internship available in FEA of Elastomers

An internship position is available in the area of Finite Element Analysis of Elastomers in the Simulation and Modeling Group at Schlumberger, Sugar Land, TX.

Fracture Simulation Using Discrete Lattice Models

Choose a channel featured in the header of iMechanica: 

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

Choose a channel featured in the header of iMechanica: 

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:

Journal Club Theme of July 2007: Mechanics of Hydrogels

Before we start this issue of J-club, I would like to recommend Prof. Langer's lecture for his MRS Von Hippel Award in the 2005 MRS Fall Meeting (Langer, 2006). His lecture not only delineated the history of the new exciting field of drug delivery and controlled release, but also told us many interesting stories happened in his career development. With Prof. Langer's pioneer work, many new materials are developed for designing new drug delivery and controlled drug release systems.

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

Zhigang Suo's picture

Self-assembled structures in a viscoelastic liquid

Choose a channel featured in the header of iMechanica: 
Free Tags: 

About a year ago, Zak Stone introduced me to YouTube with this video titled amazing liquid. I wonder how much of this behavior is understood. There must be a lot of fantastic videos of mechanical phenomena on YouTube. Perhaps we can embed them in iMechanica, and comment on them. Teng Li has provided an instruction of how to embed videos. You can check out a few other interesting videos in iMechanica video channel.

Pages

Subscribe to RSS - viscoelasticity

Recent comments

More comments

Syndicate

Subscribe to Syndicate