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Viscoelastic

Online finite element analysis of nanoindentation (indentation)

Dear All, 

 

We (the NanoBIO Node at Illinois ) have a preliminary release of an online finite element analysis of nanoindentation (indentation) tool using FEAP

This preliminary release is limited to linear elastic material, axisymmetric geometry, spherical rigid indenter, and various boundary conditions. 

Mechanical characterization and micromechanical modeling of bread dough. J.Rheol [http://dx.doi.org/10.1122/1.4768463]

The mechanical behavior of dough, gluten, and
starch was studied in an effort to investigate whether bread dough can be
treated as a two phase (starch and gluten) composite material. Mechanical
loading tests revealed rate-dependent behavior for both the starch and the
gluten constituents of dough. There is evidence from cryo-scanning electron
microscopy that damage in the form of debonding between starch and gluten
occurs when the sample is stretched. In addition, the Lodge material model was
found to deviate from the tension and shear stress-strain test data by a

Hyperelastic and Viscoelastic material modelling

I have a doubt regarding the Hyperelastic and Viscoelastic material modelling in ANSYS using Mooney-Rivlin material constants.

ANSYS theory manual says that for large deformation and large strains, the material modelling (i.e. constitutive behaviour) is same for hyperelastic and viscoelastic. Is it so?

Generally,  Mooney-Rivlin material constants are used to model Hyperelastic behaviour (rubber-like materials).

thermoplastic material

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duping812's picture

Tunable electrical and mechanical responses of PDMS and polypyrrole nanowire composites


Journal of Physics D: Applied Physics

Ping Du, Xi Lin, Xin Zhang

Volume 46, Number 19, Page 195303

doi:10.1088/0022-3727/46/19/195303

A generic experimental procedure is presented in this work to enhance
the electrical responses of polydimethylsiloxane (PDMS) through
incorporation of conducting polymer nanowires, while maintaining the
desirable mechanical flexibility of PDMS. The conducting polypyrrole

Xi Liu's picture

viscoelastic material characterization and modeling

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Hi,

I used TA DMA tested the viscoelastic material properties (stress relaxation test). When I did Time-Temperature Superposion to create the mater curve, i found some of the shift-X values were negative (those points after Tg), which cannot be fit to WLF function. ANybody knows the reason behind this?  I excluded those point when fit the WLF coefficients, is this acceptable?

And I found the C1 and C2 of one material are negative, can i still use it at high temperature? thank you

Viscoelasticity Kelvin-voigt model in Abaqus

Hi all,

I'm trying to model kelvin-Voigt type material (response of it during time)

The equation is very basic : sigma*epsilon+d/dt epsilon*viscosity coefficient(eta)

i'm wondering how to impliment the viscous term eta in Pa.s (experimental results gave me the value) in my model.

The theory is very simple but i can't figure out how to do such thing in Abaqus.

I tried Pony type but i don't now how to calculate the coefficients..

 

Can you help me?

Viscoelastic model parameters in LS-Dyna

Choose a channel featured in the header of iMechanica: 

I'm using elastic solid elements to model wave propagation in an
structure in LS-DYNA. I need to add the effect of dissipation in the
system by using viscoelastic material model (MAT_006). All I know from
my material is storage & loss modulus (E=E'+E"*i). I was wondering
how can I transform these parameters into G0, GI and BETA needed by
MAT_006 (G=Gi+(G0-Gi)*exp(-beta*t))?

ansys viscoelastic model

Choose a channel featured in the header of iMechanica: 

 Hi

Need user material Fortran code for viscoelastic

Where I can find the subroutine of a user material Fortran code for Viscoelastic constitutive model?

Does anyone has the subroutine for LS-DYNA ?

Can anyone help me?

Viscoelastic material model in abaqus-am i taking the correvt approach

Hi all,

I have been trying to gain an understanding of representing a viscoelastic material in abaqus. To do this i have been trying to represent polypropylene using data obtained from creep curves found in literature (attached). To now what i have been doing is the following: Note i am using Abaqus 6.7

In material manager: selecting Elastic-inputting Instantaneous Youngs Modulus, E, Poissons, v, (E=1.8GPa, v=0.4) and setting the moduli time scale to instantaneous. And Viscoelastic-Domain:Time, Time=Creep Test data and inputting Shear Test Data

Dynamic Modeling for Viscoelastic material using ANSYS

Hello,

I am planing to model a viscolestic material in ANSYS and condition is dynamic.

Could anyone please suggest what are the essential things (i mean datas) required for modeling a viscoelastic material?

For example, If I do the DMA test of viscoelastic materials i can have the modulus data at different frequencies. How to use those data in ANSYS to find out the stress-strain curve?

Thnaks for your kind help

parimal maity

please help me

hello i am writing u from ethiopia now i am doing  design and modeling of motorcycle helmet using viscoelastic materials but i couldn't be able to understand how to use the material models so please help me by showing the prosudure how to use viscoelastic materials proporty

yours araya

arya_abera@yahoo.com

Indentation test modelling on Ansys

I am currently doing simulation on Ansys regarding the indentation test for viscoelastic material. I have some problem with the contact element.. Can someone help me on?

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